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Journal ArticleDOI

Laser deposition of carbide-reinforced coatings

W. Cerri, R. Martinella, G.P. Mor, P. Bianchi1, D.D. 'Angelo1 
10 Dec 1991-Surface & Coatings Technology (Elsevier)-Vol. 49, pp 40-45
TL;DR: In this paper, the results of laser cladding experimental results using families of carbides (tungsten and titanium) mixed with metallic alloys are reported as substrates, low alloy construction steel (AISI 4140) (austenitic stainless steel) samples have been utilized, depending on the particular carbide reinforcement application.
Abstract: CO2 laser cladding with blown powder presents many advantages: fusion bonding with the substrate with low dilution, metallurgical continuity in the metallic matrix, high solidification rates, ease of automation, and reduced environmental contamination In the present paper, laser cladding experimental results using families of carbides (tungsten and titanium) mixed with metallic alloys are reported As substrates, low alloy construction steel (AISI 4140) (austenitic stainless steel) samples have been utilized, depending on the particular carbide reinforcement application The coating layers obtained have been characterized by metallurgical examination They show low dilution, absence of cracks, and high abrasion resistance The WC samples, obtained with different carbide sizes and percentages, have been characterized with dry sand rubber wheel abrasion tests and the specimen behaviour has been compared with the behaviour of materials used for similar applications The abrasion resistance proved to be better than that of other widely used hardfacing materials and the powder morphology have a non-negligible influence on the tribological properties
Citations
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Journal ArticleDOI
TL;DR: In this article, a review on the various synthesis routes of TiC reinforced Fe-based composites, i.e., powder metallurgy, conventional melting and casting, carbothermic reduction, combustion synthesis, aluminothermic reductions, electron beam radiation, laser surface melting, and plasma spray synthesis, highlighting the advantages and disadvantages associated with the different routes of synthesis.
Abstract: The major thrust underlying the processing of Fe-based composites has been directed towards improving the wear resistance of steel or castiron by incorporating some reinforcing phase, e.g., carbides, oxides, etc. The present article provides a review on the various synthesis routes of TiC reinforced Fe-based composites, i.e., powder metallurgy, conventional melting and casting, carbothermic reduction, combustion synthesis, aluminothermic reduction, electron beam radiation, laser surface melting, and plasma spray synthesis, highlighting the advantages and disadvantages associated with the different routes of synthesis.

205 citations

Journal ArticleDOI
TL;DR: In this article, a pulsed Nd:YAG laser was used to deposit multi-layer overlapped cladding on low carbon steel substrate using dynamic powder blowing technique, and the results showed that fully dense and crack free clad surfaces of WC-Co with an excellent metallurgical bonding and low dilution were deposited.
Abstract: Laser cladding is an advanced material processing technology that has potential to deposit various materials locally on highly non-planar and complex surfaces. It can be used to refurbish or improve corrosion, wear and other surface related properties of components. The laser cladding of WC–Co using continuous wave (CW) laser has been tried and problems, like—cracks, porosity, poor bonding, partial melting of WC particles in the Co matrix, etc., have been observed. To resolve these issues, the successful laser cladding with alternate binder materials, like—Ni, Fe, Co–Cr, Ni–B–Si, etc., have been reported. In the present study, a pulsed Nd:YAG laser was used to deposit multi-layer overlapped cladding on low carbon steel substrate using dynamic powder blowing technique. Thus, produced laser cladding samples were subjected to various mechanical tests and metallurgical analyses. The results showed that fully dense and crack free clad surfaces of WC–Co with an excellent metallurgical bonding and low dilution were deposited. No melting of WC particles in the Co matrix was observed during the microscopy. The average microhardness at the clad surface was about 1350 HV, while that at substrate was 200 HV. The observed adhesion strength of the WC–Co cladding to the substrate was about 60 MPa.

174 citations

Journal ArticleDOI
27 Jan 2012-Wear
TL;DR: The microstructures and performance of Ni-tungsten carbide composite overlays deposited by plasma transferred arc welding are studied using a combination of microscopy, hardness, and wear testing.

91 citations


Cites background from "Laser deposition of carbide-reinfor..."

  • ...The abrasive wear resistance increases strongly with the addition of tungsten carbide (WC) into the metallic matrix [2,4–8]....

    [...]

Journal ArticleDOI
TL;DR: In this article, the authors examine methods of assessing the wear resistance of coated and uncoated materials, and present a simple procedure for conducting wear tests to simulate industrial wear problems, in order for specialists to make adequate judgement on the life of a particular component in service.

89 citations


Cites methods from "Laser deposition of carbide-reinfor..."

  • ...[33], using similar equipment, examined the abrasion resistance of carbide powders with several materials and coatings used for applications in abrasive environments....

    [...]

Journal ArticleDOI
TL;DR: In this paper, a wear-resistant surface of metal matrix composite on AA6061 aluminum alloy by laser surface melting of pre-pasted Mo-WC powder was successfully achieved using a 2kW CW Nd-YAG laser.
Abstract: The creation of a wear-resistant surface of metal matrix composite on AA6061 aluminum alloy by laser surface melting of pre-pasted Mo–WC powder was successfully achieved using a 2-kW CW Nd-YAG laser. A high-quality coating without porosity or cracking was obtained. Excellent bonding between the coating and the aluminum alloy substrate was ensured by the strong metallurgical interface. Different ratios of Mo and WC powders were investigated. The chemical composition, microstructure and surface morphology of the clad layer were analyzed using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffractometry (XRD). The surface hardness of the Al specimens clad with Mo/WC is increased seven-fold. The samples have been characterized with abrasive pin-on-disc wear tests. The test results show that the composite coating with a WC hard phase has improved abrasive wear resistance when compared with the as-received Al substrate. The wear mechanism of the specimens is discussed based on microscopic observation of the worn surface.

83 citations

References
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Journal ArticleDOI
01 Jan 1989-Wear
TL;DR: In this paper, the effects of size and volume fraction of a reinforcing phase on the wear behavior of multiphase materials were investigated using pin-on-paper abrasion tests.

64 citations

Journal ArticleDOI
01 Apr 1989-Wear
TL;DR: Hard coatings, consisting of WC, TiC or Cr3C2 particles with a nickel or cobalt matrix were compared with conventional wear-resistant materials like hardened steel 100 Cr6, Ferro TiC P143, WC-Co hard metal and a widely used thermal spray layer NiCrBSi.

37 citations

Proceedings ArticleDOI
24 Oct 1988
TL;DR: In this paper, an in situ composite surface layer of particulate material in a matrix made up of the parent metal is formed by the laser melt/particle injection process, which makes the injected surface layer hard and wear resistant.
Abstract: By the laser melt/particle injection process, an in situ composite surface layer of particulate material in a matrix made up of the parent metal is formed. The particles are usually metal carbides which makes the injected surface layer hard and wear resistant. In this paper, the processing technique and the microstructures obtained are described. In addition, the hardness and wear characteristics of the modified surface are discussed.

4 citations