Journal
ACTA MATERIALIA
Volume 56, Issue 14, Pages 3414-3421Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.03.022
Keywords
stainless steel; hydrogen embrittlement; nickel; low-temperature deformation; tension test
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The effect of nickel equivalent on hydrogen gas embrittlement (HGE) of austenitic stainless steels of Fe-(10-20)Ni-17Cr-2Mo alloys vacuum-melted in a laboratory, based on type 316 stainless steel, was investigated. Tensile tests were conducted in hydrogen and helium at 1 MPa in the temperature range from 80 to 300 K. It was found that HGE of the alloys below a nickel equivalent of 27% increased with decreasing temperature, reached a maximum at 200 K, and then decreased with further decreasing temperature, whereas no HGE occurred above the nickel equivalent of 27%. It was observed that the content of strain-induced alpha' martensite increased with decreasing temperature and nickel equivalent, and hydrogen-induced fracture occurred mainly along alpha' martensite structure. Thus, the susceptibility to HGE depended on nickel equivalent. It was discussed that HGE was controlled by strain-induced a' martensite above 200 K, whereas it was controlled by hydrogen transport below 200 K. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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