オーステナイト系ステンレス鋼溶接金属のSSRT特性に及ぼす-45℃,106 MPa水素ガスの影響

Translated title of the contribution: Effect of 106 MPa gaseous hydrogen at -45 ℃ on SSRT properties of austenitic stainless steel weld metals

中村 眞実, 佐藤 豊幸, 山口 則和, 濱田 繁, 松永 久生, 松岡 三郎

Research output: Contribution to journalArticle

Abstract

<p>In order to study the hydrogen embrittlement behavior of austenitic stainless steel weld metals, slow strain rate tensile (SSRT) tests were performed in 106 MPa gaseous hydrogen at −45 °C. Tensile specimens, in which whole of the gauge section consists of weld metals, were machined out from a TIG welded round bar. The base metal was SUS316 (hi-Ni), and the filler metals were 317L, 316 and 316L. The nickel equivalent values of SUS316 (hi-Ni) base metal, and 317L, 316 and 316L weld metals were 29.7, 30.0, 28.9 and 28.3 mass %, respectively. Two types of weld metals were tested; one was as-welded metal, and the other was post-welded solution-treated weld metal. The relative reduction of area, RRA, was 0.55 for 317L as-welded metal, and approximately 0.9 for SUS316 (hi-Ni) base metal and 317L, 316 and 316L post-welded solution-treated weld metals. The result indicated that the resistance against hydrogen embrittlement was improved by the post-welded solution-treatment. The fracture surface of SUS316 (hi-Ni) base metal and 317L post-welded solution-treated weld metal was entirely covered with dimples, whereas the fracture surface of 316 and 316L post-welded solution-treated weld metals was covered with dimples and quasi-cleavages. Accordingly, it was concluded that 317L post-welded solution-treated weld metal with the highest nickel equivalent had an excellent resistance against hydrogen embrittlement, which was recommended for use in high-pressure hydrogen components.</p>
Translated title of the contributionEffect of 106 MPa gaseous hydrogen at -45 ℃ on SSRT properties of austenitic stainless steel weld metals
Original languageJapanese
Pages (from-to)OS16-12
JournalM&M材料力学カンファレンス
Volume2016
Issue number0
DOIs
Publication statusPublished - 2016

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