表層加工された低炭素ステンレス鋼溶接部における粒界すべり挙動に及ぼす残留応力および加工硬化の影響

英字タイトル:
Effect of Residual Stress and Hardening on Grain Boundary Sliding in Welds of Low-carbon Stainless Steels with Surface Machining
著者:
森裕章 Hiroaki MORI 勝山仁哉 Jinya KATSUYAMA 望月正人 Masahito MOCHIZUKI 西本和俊 Kazutoshi NISHIMOTO
発刊日: 2008年4月 1日
公開日: 2019年3月 6日

カテゴリ: 論文

キーワードタグ:
Grain boundary slidingIntergranular stress corrosion cracking (IGSCC)Low-carbon austenitic stainless steelResidual stressSurface machiningWeldsWork hardening

概要

To clarify the effects of residual stress and hardening on intergranular stress corrosion cracking (IGSCC) behavior in welds of low-carbon austenitic stainless steels with surface machining, residual stress and hardness were evaluated by 3-dimentional thermo elastic-plastic analysis and grain boundary sliding behavior was examined using a constant strain rate tensile test. It was revealed that grain boundary sliding occurred in the material at 561K by the tensile test with the numerically simulated tensile residual stress due to multi-pass welding and surface machining. In addition, it was clarified that the grain boundary energy is raised by the grain boundary sliding. On the basis of these results, it was concluded that the cause of IGSCC in the welds of low-carbon austenitic stainless steel with surface hardening is the increase in grain boundary energy due to grain boundary sliding induced by residual stress of multi pass welding and surface hardening.