NDLI: Effect of Grain Size and Dislocation Density on Strain-Induced Martensitic Transformation in Austenitic Stainless Steels

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Effect of Grain Size and Dislocation Density on Strain-Induced Martensitic Transformation in Austenitic Stainless Steels

Content Provider	Semantic Scholar
Author	Furukane, Shun Torizuka, Shiro
Copyright Year	2019
Abstract	オーステナイト(γ)系ステンレス鋼であるSUS316L鋼は,耐食性や耐水素脆化特性などの優れた物理的性質を有しており,圧縮水素貯蔵用の圧力容器などに利用されている。Ni量が多いSUS316L鋼は,γ系ステンレス鋼の中でも比較的 γ相の安定性が高い鋼種として知られているが,室温においても強加工を施すことで微量ではあるが加工誘起マルテンサイト(α’)相が形成される。FCC構造である母相の γ相に比べてBCC構造であるα’相の水素拡散係数は格段に大きく,α’相が水素の拡散経路として働くことで耐水素脆性を低下させる。これに対して,α’相は硬質相であるため材料の高強度化にも寄与する。したがって,用途に応じてSUS316L鋼の加工誘起変態挙動を制御することは, 水素社会実現に向けた重要な課題の一つである。準安定 γにおける加工安定性の指標として,Md30やNi当量などが提案されている。Noharaらは,Md30の結晶粒度依存性について,Md30を補正した次式を提案した。 (1)
Starting Page	827
Ending Page	836
Page Count	10
File Format	PDF HTM / HTML
DOI	10.2355/tetsutohagane.tetsu-2019-004
Volume Number	105
Alternate Webpage(s)	https://www.jstage.jst.go.jp/article/tetsutohagane/105/8/105_TETSU-2019-004/_pdf
Alternate Webpage(s)	https://doi.org/10.2355/tetsutohagane.tetsu-2019-004
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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