PSI - Issue 19

Available online at www.sciencedirect.com Available online at www.sciencedirect.com

ScienceDirect ScienceDirect

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 19 (2019) 494–503

Fatigue Design 2019 Effect of high-pressure H 2 gas on tensile and fatigue properties of stainless steel SUS316L by means of the internal high-pressure H 2 gas method Akira Ueno a * and Guenec Benjamin b Fatigue Design 2019 Effect of high-pressure H 2 gas on tensile and fatigue properties of stainless steel SUS316L by means of the internal high-pressure H 2 gas method Akira Ueno a * and Guenec Benjamin b

a Ritsumeikan Univ., 1-1-1 Noji-higashi, Kusatsu, Siga 525-8577, Japan b Toyama Prefecture Univ., 5180 Kurokawa, Imizu, Toyama 939-0398, Japan a Ritsumeikan Univ., 1-1-1 Noji-higashi, Kusatsu, Sig 525-8577, Jap n b Toyama Prefecture Univ., 5180 Kurokawa, Imizu, Toyama 939-0398, Japan

Abstract Abstract

For prohibiting a global warming, fuel-cell systems without carbon dioxide emissions are a one of the promising technique. In case of a fuel-cell vehicle (FCV), high-pressure H 2 gas is indispensable for a long running range. Although there are lot of paper for studying a hydrogen embrittlement (HE), there are few paper referred to the effect of high-pressure H 2 on the HE phenomenon. In this study, an effect of high-pressure H 2 gas on tensile & fatigue properties of stainless steel SUS316L were investigated by means of the internal high-pressure H 2 gas technique . Main findings of this study are as follows; 1) Although there are almost no hydrogen embrittlement effect on the 0.2 % proof stress and tensile strength, elongation and reduction of area decrease in H 2 gas environment, 2) For case of low Ni eq material, fatigue life and fatigue limit decrease in H 2 gas environment, 3) For case of low Ni eq material, not a few  ’ martensitic phase generated on the fatigue fractured specimen . For prohibiting a global warmin , fuel-cell systems without carbon di xide emissions are a one of the promising t chnique. In case of a fuel-cell vehicle (FCV), high-pressure H 2 gas is indispensable for a long running range. Although there are lot of paper for studying a hydrogen embrittlement (HE), there are few paper referred to the effect of high-pressure H 2 on the HE phenomenon. In this study, an effect of high-pressure H 2 gas on t nsile & fatigue properties of stainless steel SUS316L were investigated by means of the internal high-pressure H 2 gas technique . Main findings of this study are as follows; 1) Although there are almost no hydrogen embrittle ent effect on the 0.2 % proof stress and tensile strength, elongation and reduction of ar a decre se in H 2 gas environment, 2) r s f l i eq t ri l, fatigue life and fatigue limit decrease in H 2 gas environment, 3) For case of low Ni eq material, not a few  ’ martensitic phase generated on the fatigue fractured specimen .

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers.

Keywords: Ultra high-pressure H 2 gas; Internal high-pressure H 2 gas technique; SUS316L; Tensile tests; Fatigue tests Keywords: Ultra high-pressure H 2 gas; Internal high-pressure H 2 gas technique; SUS316L; Tensile tests; Fatigue tests

1. Introduction 1. Introduction

For stopping a global warming and/or for saving fossil fuel, hydrogen gas is a one of promising clean energy. For designing metallic components of hydrogen systems, effect of hydrogen embrittlement (HE) should be considered. On For stopping a global warming and/or for saving fossil fuel, hydrogen gas is a one of promising clean energy. For designing metallic components of hydrogen systems, effect of hydrogen embrittlement (HE) should be considered. On

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. * Correspon ing a th r. Tel.: +81-77-561-4806; fax: +81-77-561-2665. E-mail address: ueno01@fc.ritsumei.ac.jp * Corresponding author. Tel.: +81-77-561-4806; fax: +81-77-561-2665. E-mail address: ueno01@fc.ritsumei.ac.jp

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 10.1016/j.prostr.2019.12.053