Stress corrosion cracking of maraging steel weldments
TL;DR: In this article, the authors investigated the stress corrosion characteristics of 18 wt-%Ni (MDN-250) maraging steel and its weldments made under different welding conditions.
Abstract: The stress corrosion characteristics of 18 wt-%Ni (MDN-250) maraging steel and its weldments made under different welding conditions have been investigated. The threshold stress intensity factor K ISCC in stress corrosion conditions has been determined in 3.5 wt-%NaCl environment for the base metal and weldments. The fractured surfaces were analysed to study the types of fracture during stress corrosion cracking in base and weld metals. Fracture toughness tests were carried out and the results obtained from these tests have been compared with K ISCC values.
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01 Jan 2012
TL;DR: In this article, experimental studies of the hydrogen embrittlement of high strength steels have been conducted and the focus has been on six types of steel, having distinctly different microstructures.
Abstract: This chapter reviews experimental studies of the hydrogen embrittlement of high strength steels. The focus has been on six types of steel, having distinctly different microstructures. The six steel types are the low alloy steels, high toughness secondary hardening steels such as AF1410, hot work die steels, martensitic secondary hardening stainless steels, maraging steels and precipitation strengthened martensitic stainless steels. The susceptibilities of these classes of steel to hydrogen embrittlement as measured by the effects of hydrogen on fracture initiation and subsequent crack growth are discussed when the steels are tested in hydrogen gas, when the hydrogen has been introduced by charging and when the hydrogen embrittlement is associated with stress corrosion cracking in distilled water or salt water.
21 citations
TL;DR: In this paper, the effect of stress concentration at the notch of 18Ni2400 maraging steel on the tensile strength of cylindrical specimens has been investigated in air and synthetic seawater environments.
17 citations
TL;DR: In this paper, three fusion welding processes, namely interpulse TIG welding, and high energy density fusion processes like electron beam welding (EBW) and laser beam welding, were used to join ultra-high-strength maraging steel and corrosion-resistant 13-8 Mo stainless steel in the solution-annealed and cold-worked condition.
Abstract: The frequently used aerospace materials, i.e., ultra-high-strength maraging steel (250) and corrosion-resistant 13-8 Mo stainless steel in the solution-annealed and cold-worked condition, have been joined by three fusion welding processes, namely interpulse TIG welding, and high energy density fusion processes like electron beam welding (EBW) and laser beam welding (LBW). The interpulse TIG welding process was carried out by using W2 grade maraging steel filler wire. The dissimilar joints were welded by EBW and LBW processes without any filler wire. All the dissimilar welded joints were characterized by microstructural observations and validated by mechanical properties in the as-welded as well as precipitation-hardened conditions after welding. The weld microstructures and microhardness profiles were correlated to the tensile strength of weld. Electron beam welded joint with precipitation hardening after welding, i.e., soaking at 510 °C and subsequent air cooling, demonstrated the superior mechanical properties among all the welds.
14 citations
TL;DR: In this article, the effect of different filler materials and composition of the filler material were also investigated to understand the SCC behavior for the weldment of 18 Ni maraging steel.
12 citations
TL;DR: In this article, the degradation of maraging steel by diacetyl monoxime thiosemicarbazone (DAMTSC) was investigated by potentiodynamic polarization, EIS, and SEM techniques.
Abstract: The corrosion inhibition of the aged 18 Ni 250 grade maraging steel in 0.5 M sulphuric acid by diacetyl monoxime thiosemicarbazone (DAMTSC) at 303–323 K has been investigated by potentiodynamic polarization, EIS, and SEM techniques. Good inhibition efficiency of DAMTSC was revealed even at low concentrations, which increased with the increase in DAMTSC concentration and decreased with the increase in temperature. The activation energies, , as well as other thermodynamic parameters (; ; ), were evaluated and discussed. The adsorption of DAMTSC on the aged maraging steel surface was found to obey the Langmuir adsorption isotherm model and shows mixed type inhibition behavior.
12 citations
Cites background from "Stress corrosion cracking of maragi..."
...Maraging steels are special class of ultrahigh strength steels that differ from conventional steels in that they are hardened by a metallurgical reaction that does not involve carbon [1]....
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TL;DR: Maraging steels are a class of high-strength steels characterised by very low carbon contents and the use of substitutional elements to produce age-hardening in iron-nickel martensites as mentioned in this paper.
Abstract: Maraging steels are a class of high-strength steels characterised by very low carbon contents and the use of substitutional elements to produce age-hardening in iron–nickel martensites. The term 'maraging' was coined from a combination of martensite and age-hardening.
103 citations
TL;DR: In this article, a simple test to predict the effect of various small surface flaws on cracking of other specimens under various stresses, and the predictions are compared with experience with a martensitic steel of the AISI 4340 type.
94 citations
TL;DR: In this article, slow displacement rate tensile tests were performed to find out the influence of ageing condition and hydrogen-charging on the notched tensile strength and fracture characteristics of T-250 maraging steel aged at various conditions.
49 citations
01 Jan 1959
40 citations
TL;DR: The microstructure of oxides formed on 250 maraging steel in steam at elevated temperatures was established as discussed by the authors, which consisted of at least two sub-layers, an innermost layer of austenitic phase and a layer of magnetite Fe 3 O 4.
36 citations