Journal ArticleDOI
Effect of ferrite transformation on the tensile and stress corrosion properties of type 316 L stainless steel weld metal thermally aged at 873 K
TLDR
In this article, the effect of microstructural changes, due to transformation of delta ferrite, on the associated variations that take place in the tensile and stress corrosion properties of type 316 L stainless steel weld deposits when subjected to postweld heat treatment at 873 K for prolonged periods (up to 2000 hours).Abstract:
This article deals with the effect of the microstructural changes, due to transformation of delta ferrite, on the associated variations that take place in the tensile and stress corrosion properties of type 316 L stainless steel weld deposits when subjected to postweld heat treatment at 873 K for prolonged periods (up to 2000 hours). On aging for short durations (up to 20 hours), carbide/ carbonitride was the dominant transformation product, whereas sigma phase was dominant at longer aging times. The changes in the tensile and stress corrosion behavior of the aged weld metal have been attributed to the two competitive processes of matrix softening and hardening. Yield strength (YS) was found to depend predominantly on matrix softening only, while sig-nificant changes in the ultimate tensile strength (UTS) and the work-hardening exponent, n, occurred due to matrix hardening. Ductility and stress corrosion properties were considerably affected by both factors. Fractographic observations on the weld metal tested for stress-corrosion cracking (SCC) indicated a combination of transgranular cracking of the austenite and interface cracking.read more
Citations
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Journal ArticleDOI
Pitting and stress corrosion cracking behavior in welded austenitic stainless steel
TL;DR: In this article, the effect of microstructural changes in 304 austenitic stainless steel induced by the processes of gas tungsten arc welding (GTAW) and laser-beam welding (LBW) on the pitting and stress corrosion cracking (SCC) behaviors was investigated.
Journal ArticleDOI
Genetic design and characterization of novel ultra-high-strength stainless steels strengthened by Ni3Ti intermetallic nanoprecipitates
Wei Xu,Pedro E.J. Rivera-Díaz-del-Castillo,Wendeng Wang,Ke Yang,Vitaliy Bliznuk,Leo A.I. Kestens,S. van der Zwaag +6 more
TL;DR: In this article, a general computational alloy design approach based on thermodynamic and physical metallurgical principles, and coupled with a genetic optimization scheme, is presented to the design of new ultra-high-strength maraging stainless steels strengthened by Ni3Ti intermetallics.
Journal ArticleDOI
Pitting and stress corrosion cracking studies on AISI type 316N stainless steel weldments
TL;DR: Pitting and stress corrosion cracking (SCC) studies on the 316N stainless steel (SS) weldments in as-welded (AW) and thermally aged (solution annealing) conditions were carried out in acidic and acidic chloride media.
Journal ArticleDOI
Effect of magnetic field applied during laser-arc hybrid welding in improving the pitting resistance of the welded zone in austenitic stainless steel
TL;DR: In this article, an external magnetic field applied during laser-arc hybrid welding was used to homogenize distribution of δ-ferrite in austenite matrix by weakening the texture intensity and promoting growth of uniform skeletal morphology.
Journal ArticleDOI
Hydrogen-assisted fatigue crack growth of AISI 316L stainless steel weld
L.W. Tsay,J.J. Chen,J.C. Huang +2 more
TL;DR: In this paper, the authors evaluated the fatigue crack growth behaviors of AISI 316L stainless steel (SS) welds in air and gaseous hydrogen, and further compared with the base plate.
References
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Journal ArticleDOI
Role of delta ferrite in thermal aging of type 316 weld metals
S. R. Keown,R. G. Thomas +1 more
TL;DR: In this paper, the effect of ferrite on the precipitation processes in type 316 austenitic stainless weld metals has been studied and it was found that the fully-astenitic deposit was particularly stable and over the time-temperature conditions investigated only discrete M23C6 carbides were observed with no evidence of any intermetallic phases.
Journal ArticleDOI
Effect of Heat Input and Microstructure on Pitting Corrosion in AISI 316L Submerged Arc Welds
TL;DR: In this paper, the pitting resistance of AISI 316L stainless steel (SS) weld metal in the as-welded and stress-relieved conditions was evaluated as a function of heat input.
Journal ArticleDOI
Ferrite decomposition in austenitic stainless steel weld metals
TL;DR: In this paper, it was shown that ferrite decomposes in α and chromium rich α′ phase at temperatures below about 490°C, whereas it transforms to σ at temperatures above 540°C.
Journal ArticleDOI
The influence of plastic straining on localized and general corrosion of stainless steels
A. Desestret,R. Oltra +1 more
TL;DR: Stress corrosion cracking of stainless steels is dependent upon different factors: (a) plastic deformation, the dissolution rate of passive and depassivated unfilmed metal, and (b) the repassivation rate.
Journal ArticleDOI
Influence of Secondary Phases on the Localized Corrosion of Thermally Aged AISI 316L Stainless Steel Weld Metal
TL;DR: The pitting resistance of AISI 316L stainless steel (SS) weld metal in asdeposited and aged conditions was evaluated by determining the critical pitting potential in an acid chloride solu... as discussed by the authors.
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