Effect of pre-strain on microstructure and hydrogen embrittlement of K-TIG welded austenitic stainless steel. (1st April 2019)

• Record Type: Journal Article
• Authors: Li, Xiaogang; Gong, Baoming; Deng, Caiyan; Li, Yizhe
• Is Part Of: Corrosion science. Volume 149(2019)
• Page Start: 1
• Page End: 17
• Publication Date: 2019-04-01
• Subjects: A. Stainless steel -- B. EPMA -- B. TEM -- C. Effects of strain -- C. Hydrogen embrittlement -- C. Welding; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.12.018
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Failure location in hydrogen embrittled stainless steel joint depends on pre-strain. Severe strain-induced α′ martensite in the base metal contributes to failure mechanism transition. Tendency of strain-induced α′ martensitic transformation for the weld metal and base metal is strongly determined by local chemical homogeneity. Abstract: The effects of pre-strain on hydrogen embrittlement of 304L K-TIG welded joint were investigated. As pre-strain of joint increased, fracture location of hydrogen-charged joint changed from weld metal to base metal. In low prestrained joints, fracture may be initiated at the sites of clustered dislocations due to hydrogen in weld metal with a high density of pre-existing dislocations. In high prestrained joints, some regions in base metal suffered severe strain-induced α′ martensitic transformation due to Ni depletion bands and cracking occurred at phase boundaries where may provide more sites for the accumulation of hydrogen atoms and dislocations.