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Michler, Thorsten; Lee, Yongwon; Gangloff, Richard P.; Naumann, Joerg
Publication
Influence of macro segregation on hydrogen environment embrittlement of SUS 316L stainless steel
Volume
Journal Article
Pages
2009
Abstract
International Journal of Hydrogen Energy
Corporate Author
Publisher
34
Editor
7
Summary Language
3201-3209
Series Editor
Hydrogen embrittlement; Austenitic stainless steel; Macro segregation; Nickel
Abbreviated Series Title
The objective of this work is to identify microstructural variables that lead to the large scatter of the relative resistance of 316 grade stainless steels to hydrogen environment embrittlement. In slow displacement rate tensile testing, two almost identical (by nominal chemical composition) heats of SUS 316L austenitic stainless steel showed significantly different susceptibilities to HEE cracking. Upon straining, drawn bar showed a string-like duplex microstructure consisting of α'-martensite and γ-austenite, whereas rolled plate exhibited a highly regular layered α'-γ structure caused by measured gradients in local Ni content (9.5-13 wt%). Both martensite and austenite are intrinsically susceptible to HEE. However, due to Ni macro segregation and microstructural heterogeneity, fast H-diffusion in martensite layers supported a 10 times faster H-enhanced crack growth rate and thus reduced tensile reduction in area. Nickel segregation is thus a primary cause of the high degree of variability in H2 cracking resistance for different product forms of 316 stainless steel.
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ISBN
0360-3199
no
NU @ karnesky @
10957
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