弾性応力下における焼戻しマルテンサイト鋼中の水素誘起格子欠陥の形成と水素脆化

Enhanced lattice defect formation associated with hydrogen and hydrogen embrittlement under elastic stress of a tempered martensitic steel

土信田 知樹*; 鈴木 啓史*; 高井 健一*; 大島 永康*; 平出 哲也  

Doshida, Tomoki*; Suzuki, Hiroshi*; Takai, Kenichi*; Oshima, Nagayasu*; Hirade, Tetsuya

焼戻しマルテンサイト鋼の一定弾性引張応力下における吸蔵水素量の変化、および格子欠陥量の変化、さらには形成された水素誘起格子欠陥と水素脆化の関係を調査した。その結果、吸蔵水素量と負荷応力だけでなく、空孔および空孔クラスターの形成・蓄積に要する時間も一定弾性応力下で起こる水素脆化において重要な因子であることが見出された。

Changes in hydrogen content and lattice defect formation associated with hydrogen under elastic tensile stress of tempered martensitic steel were examined. The relationship between hydrogen embrittlement and lattice defects associated with hydrogen was also investigated. The results obtained in this study can be summarized as follows. Besides hydrogen content and applied stress, time of the formation and accumulation of vacancies was also closely involved in hydrogen embrittlement and is concluded to be an important factor causing hydrogen embrittlement.