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Effect of pre-strain on microstructure and hydrogen embrittlement of K-TIG welded austenitic stainless steel.
- Source :
-
Corrosion Science . Apr2019, Vol. 149, p1-17. 17p. - Publication Year :
- 2019
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0010938X
- Volume :
- 149
- Database :
- Academic Search Index
- Journal :
- Corrosion Science
- Publication Type :
- Academic Journal
- Accession number :
- 134597647
- Full Text :
- https://doi.org/10.1016/j.corsci.2018.12.018