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Metals 2016, 6(7), 169; doi:10.3390/met6070169

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

School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Korea
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Academic Editor: Soran Birosca
Received: 12 May 2016 / Revised: 11 July 2016 / Accepted: 16 July 2016 / Published: 20 July 2016
(This article belongs to the Special Issue Process-Structure-Property Relationships in Metals)
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Abstract

Plastic deformation and strain-induced martensite (SIM, α′) transformation in metastable austenitic AISI 304 stainless steel were investigated through room temperature tensile tests at strain rates ranging from 2 × 10−6 to 2 × 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. View Full-Text
Keywords: stainless steel; hydrogen embrittlement; strain-induced martensite; magnetic force microscopy stainless steel; hydrogen embrittlement; strain-induced martensite; magnetic force microscopy
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MDPI and ACS Style

Bak, S.H.; Abro, M.A.; Lee, D.B. Effect of Hydrogen and Strain-Induced Martensite on Mechanical Properties of AISI 304 Stainless Steel. Metals 2016, 6, 169.

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