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Metals 2017, 7(2), 58; doi:10.3390/met7020058

Effect of Low-Temperature Sensitization on Hydrogen Embrittlement of 301 Stainless Steel

1
Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan
2
Institute of Materials Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Robert Tuttle
Received: 7 January 2017 / Revised: 1 February 2017 / Accepted: 10 February 2017 / Published: 15 February 2017
(This article belongs to the Special Issue Alloy Steels)
View Full-Text   |   Download PDF [4899 KB, uploaded 15 February 2017]   |  

Abstract

The effect of metastable austenite on the hydrogen embrittlement (HE) of cold-rolled (30% reduction in thickness) 301 stainless steel (SS) was investigated. Cold-rolled (CR) specimens were hydrogen-charged in an autoclave at 300 or 450 °C under a pressure of 10 MPa for 160 h before tensile tests. Both ordinary and notched tensile tests were performed in air to measure the tensile properties of the non-charged and charged specimens. The results indicated that cold rolling caused the transformation of austenite into α′ and ε-martensite in the 301 SS. Aging at 450 °C enhanced the precipitation of M23C6 carbides, G, and σ phases in the cold-rolled specimen. In addition, the formation of α′ martensite and M23C6 carbides along the grain boundaries increased the HE susceptibility and low-temperature sensitization of the 450 °C-aged 301 SS. In contrast, the grain boundary α′-martensite and M23C6 carbides were not observed in the as-rolled and 300 °C-aged specimens. View Full-Text
Keywords: stainless steel; hydrogen embrittlement; hydrogen charging; G and σ phases; α′ martensite stainless steel; hydrogen embrittlement; hydrogen charging; G and σ phases; α′ martensite
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Yu, C.; Shiue, R.-K.; Chen, C.; Tsay, L.-W. Effect of Low-Temperature Sensitization on Hydrogen Embrittlement of 301 Stainless Steel. Metals 2017, 7, 58.

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