4.5 Article

Effect of Hydrogen and Strain-Induced Martensite on Mechanical Properties of AISI 304 Stainless Steel

期刊

METALS
卷 6, 期 7, 页码 -

出版社

MDPI AG
DOI: 10.3390/met6070169

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stainless steel; hydrogen embrittlement; strain-induced martensite; magnetic force microscopy

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  1. Human Resource Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry and Energy [20134030200360]

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Plastic deformation and strain-induced martensite (SIM, alpha') transformation in metastable austenitic AISI 304 stainless steel were investigated through room temperature tensile tests at strain rates ranging from 2 x 10(-6) to 2 x 10(-2)/s. The amount of SIM was measured on the fractured tensile specimens using a feritscope and magnetic force microscope. Elongation to fracture, tensile strength, hardness, and the amount of SIM increased with decreasing the strain rate. The strain-rate dependence of RT tensile properties was observed to be related to the amount of SIM. Specifically, SIM formed during tensile tests was beneficial in increasing the elongation to fracture, hardness, and tensile strength. Hydrogen suppressed the SIM formation, leading to hydrogen softening and localized brittle fracture.

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