Showing papers on "Inconel published in 2006"

Laser-assisted machining of Inconel 718 with an economic analysis

Abstract: Superalloys have high strengths at elevated temperatures, which make them attractive toward various applications and also make these materials difficult to machine at room temperature due to excessive tool wear and poor surface finish. Laser-assisted machining (LAM) offers the ability to machine superalloys more efficiently and economically by providing the local heating of the workpiece prior to material removal by a single point cutting tool. An existing transient, three-dimensional heat transfer model is modified for modeling LAM of Inconel 718. Suitable coating conditions are determined for increasing the laser absorptivity in metals and an approximate absorptivity value is determined. The thermal model is validated in axial and circumferential directions by temperature measurement using an infrared camera. The machinability of Inconel 718 under varying conditions is evaluated by examining tool wear, forces, surface roughness, and specific cutting energy. With increasing material removal temperature from room temperature to 620 °C, the benefit of LAM is demonstrated by a 25% decrease in specific cutting energy, a 2–3-fold improvement in surface roughness and a 200–300% increase in ceramic tool life over conventional machining. Moreover, an economic analysis shows significant benefits of LAM of Inconel 718 over conventional machining with carbide and ceramic inserts.

Microstructural study of transient liquid phase bonded cast INCONEL 738LC superalloy

Abstract: The microstructure of the transient liquid phase (TLP) bonded joint of a cast INCONEL 738LC superalloy, made with a commercial Ni-Cr-B filler alloy, Nicrobraz 150, was examined by analytical scanning and transmission electron microscopic techniques. Due to incomplete isothermal solidification at the bonding temperature, the residual liquid interlayer transformed to nonequilibrium eutectic microconstituents consisting of chromium-rich M5B3, nickel-rich M23B6, and nickel-based γ solid solution phases. Also, a significant volume fraction of complex fcc Cr-Mo-W rich carboborides was observed in the joint/base alloy interface region. This is contrary to the predictions of the currently available TLP models that predict a precipitate-free joint/base alloy interface. It is suggested that solid-state diffusion of boron prior to completion of equilibration process induced the formation of carbo-boride phase, which needs to be adequately considered to develop an optimum postbraze heattreatment process to produce a joint with optimum properties.

The erosion–corrosion behaviour of high velocity oxy-fuel (HVOF) thermally sprayed inconel-625 coatings on different metallic surfaces

Abstract: The minimization of cost and the enhancement of reliability of rotating and stationary fluid machinery equipment that are subjected to highly erosive and corrosive environments is mandatory in the oil and gas production industries. This can be achieved by minimizing the material damage resulting from the combination of solid particle impingement and corrosion. The high velocity oxy-fuel (HVOF) process is one method of producing metallic coatings to protect metallic surfaces from high temperature, wear, and corrosive environments. Stainless steel components coated with Inconel-625 are very common in the oil/gas industry. In this study, the erosion–corrosion characteristics of HVOF thermally sprayed Inconel-625 powder coatings were evaluated when applied on three different metallic surfaces: (a) plain stainless steel (SS), (b) spot-welded stainless steel (SW-SS), and (c) a composite surface of stainless steel and carbon steel welded together (C-SS-CS). These coated surfaces were tested in a jet impingement rig under two fluid conditions: (i) free from added solids, (ii) containing 1% silica sand. Weight loss measurements were used to provide a measure of the amount of material loss that each coated surface experienced, and the influence of time during impingement testing was taken into consideration. The surface morphology and the elemental composition of the coating before and after the erosion–corrosion test were examined using the SEM and EDS techniques. The results indicated that the coating over both spot-welded and plain stainless steel surfaces exhibited a similar degree of weight loss. However, the coating on the composite surface experienced a greater degree of weight loss. Microscopic observations of the fracture surfaces showed that the metal removal of the tested surface was concentrated around the unmelted and the semi-melted particles of the deposit.

A comparison of inertia friction welds in three nickel base superalloys

Abstract: In this paper the microstructure, mechanical properties and residual stresses are compared for three inertia friction welded nickel-base superalloys. In contrast to alloy 720Li and RR1000, for Inconel 718 welding produces a precipitation free region leading to significantly reduced strength near the weld line. As a result, for alloy 720Li the hoop stresses are 1.5 times, and in RR1000 two times, higher than the tensile hoop stresses for Inconel 718. The maximum tensile weld stresses in Inconel 718 and RR1000 are yield stress limited in the weld region. That stresses significantly below the yield stress are found near the weld for alloy 720Li may be because the inferior creep properties of alloy 720Li compared to RR1000 result in stress relief during cooling after welding. Post weld heat treatment at the standard maximum aging temperature for Inconel 718 (732 °C), relieved residual hoop stresses to below 400 MPa. To achieve a similar level of residual hoop stress, Alloy 720Li must be stress relieved at least 30 °C and RR1000 about 80 °C hotter.

Microstructural evolution during transient liquid phase bonding of Inconel 617 using Ni–Si–B filler metal

Abstract: The influence of process parameters on microstructural characteristics of transient liquid phase (TLP) bonded Inconel 617 alloy was investigated. Experiments were carried out at 1065 °C using nickel based filler metal (Ni–4.5% Si–3% B) with B as the melting point depressant (MPD) element. Two different thickness of interlayer and various holding times were employed. The influence of these processing parameters on the characteristics of the joint area particularly size, morphology and composition of precipitates was investigated. The presence of MoB, Mo 2 B, M 23 C 6 , TiC, M 23 (B, C) 6 and Ni 3 B precipitates in the diffusion layer and Ni 3 B, Ni 3 Si and Ni 5 Si 2 precipitates in the interlayer at the interface between the base metal and interlayer were demonstrated using electron back scattered diffraction (EBSD), energy dispersive spectrometry (EDS) and TEM.

Influence of process parameters on microstructure of transient liquid phase bonded Inconel 738LC superalloy with Amdry DF-3 interlayer

Abstract: The effect of bonding temperature and time on microstructure of diffusion brazed joint of nickel base superalloy Inconel 738LC using Amdry DF-3 filler, alloy was investigated. It was observed that the formation of eutectic microconstituents, within the joint regions, was significantly influenced by the brazing temperature and time. A deviation from the conventional transient liquid phase (TLP) bonding diffusion models was observed in samples brazed above 1175 °C. The rate of isothermal solidification was substantially reduced at this brazing temperature, and also resulted in the formation of a centerline eutectic microconstituent, which was different from that observed at lower bonding temperatures. It is suggested that a probable factor contributing to the change in isothermal solidification rate and the formation of a different type of eutectic microconstituent from that observed at lower temperatures, is the considerable enrichment of the liquated insert with Ti atoms from the base alloy matrix, since they normally exhibit a lower solidification partition coefficient in nickel based alloys.

Friction stir welding of Inconel alloy 600

Abstract: Nickel-based superalloys have been developed to increase the energy efficiency, performance and to reduce the cost of industrial turbine engines and the other high temperature components. To manufacture a modern, flexible and high performance turbine system, joining or welding processes including gas tungsten arc welding (GTAW), electron beam welding (EBW), laser welding or friction stir welding (FSW) are generally required [1]. FSW, which was invented in 1991 by The Welding Institute (TWI), Cambridge, England [2], is a solid-state joining process. Since FSW involves no melting, this process eliminates the problems associated with fusion welding such as fumes, arc glare, spatter, solidification cracking, shrinkage, severe distortion and solidification stress. It also provides a significant economic advantage in terms of savings in the weld preparation time, welding time, consumable costs and labor rate for veteran technicians [3–5]. Over the past 15 years, it has been proven to be a promising joining process for low melting point materials including aluminum and magnesium alloys. However, these materials represent less than 10% of the welded products in the world. On the other hand, high melting point materials, such as steel and nickel-based superalloys, represent more than 80% of the welded materials [6]. Therefore, it is very promising to apply FSW to high melting point materials. In this study, a new approach was made to join the Inconel alloy 600 by FSW, and the joint properties and microstructures were examined. One of the major obstacles for the commercialization of FSW applying in high melting point temperature materials is the relatively short tool life due to wear [7], therefore, good wear resistant tungsten carbide-based alloy tools and polycrystalline cubic boron nitride (PCBN) tools are commonly applied. A tungsten carbide-based alloy tool developed by our group [8] was used in this study and its appearance is given in Fig. 1. The diameter of the probe was 6 mm and its length was 1.8 mm. The base material was a 2-mm-thick nickel-based superalloy (commercially called Inconel 600) with a melting point of 1630 K, and its nominal composition (wt.%) was 76.0 Ni, 15.5 Cr, 8.0 Fe, 0.25 Si, 0.50 Mn, 0.08 C and 0.008 S. A butt friction stir welded (FSWed) joint was produced at a welding speed of 1.67 mm/s and a tool rotation speed of 400 rpm. The tool was tilted at 3 from the vertical and argon shielding gas was utilized to prevent oxidation of the joint surface. Fig. 2 is a photograph of the FSW process applying in Inconel 600. The tool shoulder reached a bright orange color. Also, as the tool travels along the seam, the weld track behind the trailing edge of the rotating tool appeared orange/bright red. Smooth and glossy surface appeared on the surface of the joint with a uniform surface semicircular ripple, which was caused by the final sweep of the trailing edge of the rotating tool. The temperature of the plate’s backside was measured and the results are summarized in Fig. 3. The temperature at the point of 2 mm away from the weld center dropped significantly about at 80 K/s (Fig. 3 (a)) and the maximum temperature at the weld line of the plates’ backside approximated to 1073 K. The temperature was also dependent on the rotation speed, increasing with higher speed and decreasing with lower speed. Fig. 4 shows the macroand microstructures of the stir zone of the transverse cross section of the joint and the microstructure of the Inconel 600 base metal (BM) (Etched by HNO3 + HCl + H2O). No volumetric defect and kissing bond were observed within the joint. The stir zone was F. Ye (&) Æ H. Fujii Æ T. Tsumura Æ K. Nakata Joining and Welding Research Institute, Osaka University, 11-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan e-mail: yefx@jwri.osaka-u.ac.jp J Mater Sci (2006) 41:5376–5379 DOI 10.1007/s10853-006-0169-6

Suppressing type IV failure via modification of heat affected zone microstructures using high boron content in 9Cr heat resistant steel welded joints

Abstract: Creep rupture strength at 923 K and microstructural evolution of welded joints have been investigated for high boron–low nitrogen–9Cr heat resistant steels developed at the National Institute for Materials Science (Japan). Welded joints were prepared from plates containing 47–180 ppm boron using gas tungsten arc welding and Inconel type filler metal, and showed superior creep properties to those of welded joints of conventional high chromium steels such as P92 and P122. No type IV failure was observed in the boron steel welded joints. A large grained microstructure was observed in the heat affected zone heated to Ac 3 (Ac 3 HAZ) during welding, whereas the grains are refined at the same location in conventional steel welded joints. The simulated Ac 3 HAZ structures of the boron steels have a creep life almost equal to that of the base metal. Large grained HAZ microstructures and stabilisation of M23C6 precipitates are probable reasons for suppression of type IV failure and improved creep resistanc...

Oxidation products of INCONEL alloys 600 and 690 in pressurized water reactor environments and their role in intergranular stress corrosion cracking

Abstract: In this work, thermodynamic arguments for the stability of Ni and Cr compounds developed under pressurized water reactor environments (\(P_{H_2 O} \) and\(P_{H_2 } \)) were experimentally tested. A mechanism is proposed to explain crack initiation and propagation alloy 600 along the grain boundaries, where Cr2O3 has formed from the leaching of Cr from the matrix, leaving behind a porous Ni-rich region. The mechanism is based on the thermodynamic potential for the transformation of a protective NiO surface layer into an amorphous nonprotective Ni(OH)2 gel. This gel would also form along the grain boundaries and when hydrogenated steam reaches the porous Ni-rich regions. Crack initiation is then favored by tensile stressing of the grain boundary regions, which can easily rupture the gelatinous film. The leaching of matrix Cr to form nonprotective CrOOH gel at the crack tip followed by the exposure of fresh porous Ni to the environment could explain crack propagation in INCONEL alloy 600. The proposed crack initiation mechanism is not expected to occur in alloy 690 where a protective Cr2O3 film covers the entire metal surface. However, crack propagation along the grain boundaries in alloy 600 and precracked alloy 690 is expected to be active as hydroxide-forming reactions weaken the boundaries.

Multilayered and nanolayered hard nitride thin films deposited by cathodic arc evaporation. Part 2: Mechanical properties and cutting performances

Abstract: The objective of this study is to investigate the performance of newly developed grades of nanolayer coated carbide tools for single point turning operation of difficult-to-cut alloys as Inconel 718. Nickel base alloys are difficult-to-machine materials because of their very good mechanical resistance at high temperature. Cemented carbide cutting tools, widely used for turning these alloys, are coated in order to promote their cutting lifetime. In this study, three compositions of multilayer coatings are deposited on cutting tools: CrN–TiN, TiN–AlTiN and CrN–AlTiN. These coatings, deposited in an industrial-size cathodic arc evaporation device, have approximately the same total thickness. Mechanical properties were first correlated to the period of these coatings. In a second time, the influence of this period, thickness of two successive nanolayers, was studied concerning turning performances. Mechanical and tribological properties are strongly dependant on coating structure (description in Part 1 [C. Ducros, C. Cayron, F. Sanchette, To be published in Surface and Coatings Technology]). The best mechanical properties were obtained with TiN/AlTiN nanolayers with 7 nm periods and superlattice structure. These coatings induced low main cutting force and low flank wear during Inconel 718 turning. Time life of superlattice TiN–AlTiN coated cutting tool is increased comparatively to CVD coated and AlTiN coated cutting tools currently used in production.

Synthesis, characterization and properties of intensified plasma-assisted nitrided superalloy Inconel 718

Abstract: Superalloy Inconel 718 (IN-718) was nitrided at relatively low temperatures (< 500 °C) by intensified plasma-assisted processing (IPAP). The structural characteristics of the nitrided layers at the surface were investigated by X-ray diffraction analysis and X-ray photoelectron spectroscopy. The IPAP-treated alloy was composed of a ∼4 μm thick single-phase layer followed by a ∼25 μm nitrogen diffusion zone. The results showed that the nitride phase formed from the anisotropic expansion of the original alloy unit cell in a similar way to that observed in the Fe–Cr–Ni system (AISI 316 austenitic stainless steel). The electron binding energy characteristics of the various elements involved in the single-phase were revealed for the first time. Micro indentation experiments showed that IPAP nitriding for 3 h caused at least a four-fold increase in the surface hardness. The nitrided surfaces were found to possess significantly improved wear and corrosion resistance. The present results show that low temperature IPAP nitriding is an effective surface treatment for IN-718.

Influences of Soaking Time in Hot Isostatic Pressing on Strength of Inconel 718 Superalloy

Abstract: Hot Isostatic Pressing (HIP) is widely used in the casting industry to remove the internal porosity generated during the casting process. It combines higher pressure and temperature to produce materials and parts with substantially better properties than those by other methods. This results in improved strength, ductility and fatigue life of castings. The aim of this paper is to discuss the methods and to find a suitable soaking time of HIP for Inconel 718 superalloy castings. In this study, the HIP temperature was maintained at 1453 K, pressure was kept 175 MPa and three different soaking time are 2, 3 and 4 h. The experiment results show that HIP treatment at 1453 K under the pressure of 175 MPa for 4 h for Inconel 718 superalloy is the optimum condition. It can decrease the porosity of Inconel 718 superalloy castings. In this study, it can reduce porosity about 86% after HIP treatment. For the tension test at a fast strain rate (0.001 s � 1 ) that it increased the tensile strength by 31% at room temperature, 27% at 813 K, and 24% at 923 K. While at a very slow strain rate (0.0001 s � 1 ), it increased the tensile strength by 24% at room temperature and 20% at 813 K. For a 3-point bending test, it showed that the optimum soaking time of HIP procedure could enhance the bending strength by 38% at room temperature and 26% at 813 K.

The Effect of Sheet Processing on the Microstructure, Tensile, and Creep Behavior of INCONEL Alloy 718

Abstract: The grain size, grain boundary character distribution (GBCD), creep, and tensile behavior of INCONEL alloy 718 (IN 718) were characterized to identify processing-microstructure-property relationships. The alloy was sequentially cold rolled (CR) to 0, 10, 20, 30, 40, 60, and 80 pct followed by annealing at temperatures between 954 °C and 1050 °C and the traditional aging schedule used for this alloy. In addition, this alloy can be superplastically formed (IN 718SPF) to a significantly finer grain size and the corresponding microstructure and mechanical behavior were evaluated. The creep behavior was evaluated in the applied stress (σ a ) range of 300 to 758 MPa and the temperature range of 638 °C to 670 °C. Constant-load tensile creep experiments were used to measure the values of the steady-state creep rate and the consecutive load reduction method was used to determine the values of backstress (σ0). The values for the effective stress exponent and activation energy suggested that the transition between the rate-controlling creep mechanisms was dependent on effective stresses (σ e =σ a σ0) and the transition occurred at σ e ≅ 135 MPa. The 10 to 40 pct CR samples exhibited the greatest 650 °C strength, while IN 718SPF exhibited the greatest room-temperature (RT) tensile strength (>1550 MPa) and ductility (e f >16 pct). After the 954 °C annealing treatment, the 20 pct CR and 30 pct CR microstructures exhibited the most attractive combination of elevated-temperature tensile and creep strength, while the most severely cold-rolled materials exhibited the poorest elevated-temperature properties. After the 1050 °C annealing treatment, the IN 718SPF material exhibited the greatest backstress and best creep resistance. Electron backscattered diffraction was performed to identify the GBCD as a function of CR and annealing. The data indicated that annealing above 1010 °C increased the grain size and resulted in a greater fraction of twin boundaries, which in turn increased the fraction of coincident site lattice boundaries. This result is discussed in light of the potential to grain boundary engineer this alloy.

Photographing impact of plasma-sprayed particles on metal substrates

Abstract: Plasma-sprayed, molten molybdenum particles (∼40 µm diameter) were photographed during impact (with velocity ∼110 m/s) on Inconel surfaces that were maintained at either room temperature or at 400 °C. Some samples were also preheated at 400 °C for 3 h and then air-cooled to room temperature before spraying. A droplet approaching the surface was sensed using a photodetector, and after a known delay, a fast charge-coupled device camera was triggered to capture images of the spreading splat from the substrate front surface. A rapid two-color pyrometer was used to collect the thermal radiation from the impacting particles to follow the evolution of their temperature and size after impact. Molten molybdenum particles impacting the surfaces at room temperature disintegrated and splashed after achieving a maximum diameter >400 µm. Impact on preheated and heated Inconel produced splats with maximum diameters between 200 and 300 µm with less fragmentation. The cooling rate of splats on preheated Inconel was larger than that of splats on nonheated Inconel. Surface analysis showed that preheating Inconel reduced the surface skewness and kurtosis, resulting in improved splat-substrate contact.

Precipitation and residual stress relaxation kinetics in shot-peened Inconel 718

Abstract: Mechanical surface treatment by shot peening followed by aging at 700 and 740 °C was performed on Inconel 718. A previously proposed XRD method (Ref 10) for the quantitative phase analysis of Inconel 718 allowed for the determination of the precipitation kinetics of the γ″ phase in the shot-peened layer and the matrix, respectively. The residual compressive stress field induced by shot peening and its relaxation behavior during aging were also determined. The relaxation process can be described by the Zener-Wert-Avrami function. The precipitation rate in the γ″ phase in the shot-peened layer is greatly accelerated, which causes differences in the γ″ phase amounts between the skin and the core during aging, especially during the initial stage. The high precipitation rate of the γ″ phase in the shot-peened layer can be interpreted by the nonequilibrium segregation of niobium.

Densification and microstructural evolution during co-sintering of Ni-base superalloy powders

Abstract: This work presents the effect of co-sintering on the densification and microstructural evolution in the two-layer stepwise graded composite of INCONEL 718 and INCONEL 625 superalloys. A pressure-less co-sintering method in conjunction with a powder layering technique was used. The sintering was carried out in solid state and liquid phase in temperature ranging from 1260 °C through 1300 °C for 60 minutes in a low pressure of an argon atmosphere. Nonisothermal sintering behavior was also examined by dilatometric analysis. Similarly, the sintering response of the individual layers was characterized. The results reveal an enhanced densification rate during co-sintering of the composite layers. Sintering at low temperatures (T<1270 °C) led to formation of a narrow dense region at the interface while the sintered layers were porous. In contrast, sintering at higher temperatures resulted in significant densification of the layers, although formation of a pore band at the interface was realized. It is suggested that the strain rate incompatibility between the layers during sintering induces mismatch stresses at the interface region. The resulting strain energy influences the densification of the boundary region by exerting a pressure on the sintering neck and affecting the material flow during liquid phase sintering. The induced densification of the bilayer configuration was experimentally measured and was shown to be in good agreement with the strain rate incompatibility.

Measurement of total hemispherical emittance and specific heat of aluminum and inconel 718 by a calorimetric technique

Abstract: An apparatus for the measurement of the total hemispherical emittance and specific heat of metals has been developed. The measurement principle is based on the calorimetric technique: the sample, heated by Joule effect and placed in a vacuum chamber; exchanges radiative heat transfer with the walls of the container, kept at a relatively low temperature. Emittance is deduced from the radiative heat transfer laws at the steady state. When the heating power is switched off the specific heat of the sample can be recovered from the time history of the sample temperature during the cooling transient. Measurements have been performed on samples of aluminum Anticorodal alloy and Inconel 718 alloy under different surface conditions in the 350-635 K range.

A new high-velocity oxygen fuel process for making finely structured and highly bonded inconel alloy layers from liquid feedstock

Abstract: High-velocity oxygen fuel (HVOF) thermal spray processes are used in applications requiring the highest density and adhesion strength, which are not achievable in most other thermal spray processes. Similar to other thermal spray processes, however, a normal HVOF process is unable to apply fine powders less than 10 µm via a powder feeder. The advantages of using smaller and even nanosized particles in a HVOF process include uniform microstructure, higher cohesion and adhesion, full density, lower internal stress, and higher deposition efficiency. In this work, a new process has been developed for HVOF forming of fine-grained Inconel 625 alloy layers using a liquid feedstock containing small alloy particles. Process investigations have shown the benefits of making single and duplex layered coatings with full density and high bond strength, which are attributed to the very high kinetic energy of particles striking on the substrates and the better melting of the small particles.

Pre-oxidation of Inconel Alloys for Inhibition of Carbon Deposition from Heated Jet Fuel

Abstract: Exposure of superalloy surfaces to jet fuel at elevated temperatures leads to the formation of carbonaceous deposits and metal sulfides. The formation of stable oxide layers on alloy surfaces can reduce the activity of the constituent transition metals that catalyze the dehydrogenation of hydrocarbons and the subsequent carbon deposit growth. The metals Ni, Cr, Fe, Mn, Al, Ti and Nb + Ta form thermodynamically stable oxide layers after oxidation above 800°C under O2 flow. In this study, we investigated the formation of oxides and spinels on three different Ni-base superalloys (Inconel 600, Inconel 718, and Inconel X750) and their activity towards carbon and sulfur deposit formation from jet fuel (JP-8) thermal stressing at 600°C and 34 atm (500 psig) for 5 hr. Metal oxide formation during pre-oxidation and the behavior of pre-oxidized samples in thermal stressing were found to depend strongly on the minor element composition of these superalloys.

Surface chemical analysis on the corrosion of alloys in the supercritical water oxidation of halogenated hydrocarbon

Abstract: A surface chemical analysis on the corrosion of various alloys under supercritical water oxidation (SCWO) conditions with relatively high concentrations of halogenated compounds and hydrogen peroxide was conducted using an Auger electron spectroscopy/scanning Auger-electron spectroscopy. The tested alloys (Inconel 600, Hastelloy C-276, Monel 400, stainless steel (SUS 316), Titanium G2, and Zirconium 702) were exposed to the same conditions: 4000 mg/L of 2,4-DCP at 400 °C and 250 bar, with 700% stoichiometric H2O2 in a Hastelloy C-276 batch reactor. Even under the supercritical water (SCW) condition of 4.8 pH without H2O2, a certain degree of corrosion was observed on the surface of all the alloys, especially SUS 316. Under the severe SCWO condition with excess H2O2, the surface corrosion of all the alloys was significant, but the types of corrosion on the alloy surfaces differed. Chromium in the SCWO process that contained H2O2 for halogenated compounds could potentially lead to the corrosion type and de...

Characterization of the interfacial properties of compound-extruded lightweight profiles using the push-out-technique

Abstract: The use of aluminium in lightweight profiles for vehicle spaceframes is state of the art due to the material's low density combined with good specific mechanical properties. Nevertheless, the absolute stiffness and strength of aluminium is rather low in comparison to steels. A possibility to increase both stiffness and strength of aluminium-based structures is the use of compound-extruded profiles in which high-strength metallic reinforcements are incorporated. Within the scope of the present investigations, compound-extruded profiles with wire-reinforcements made of stainless spring steel 1.4310 (X10CrNi18-8), nickel-base superalloy Inconel 718 or cobalt-base alloy Haynes 25 in an AA6060 aluminium matrix were characterized in terms of the debonding shear strength using the push-out-technique. In addition to varying the reinforcement materials, the investigations focussed on the influence of different chemical and mechanical pre-treatments.