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

焼き戻しマルテンサイト鋼の定荷重下における水素誘起格子欠陥成長と水素脆化

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

欠陥のプローブとして、水素昇温脱離と陽電子プローブマイクロアナライザーを用い、弾性応力下における焼戻マルテンサイト鋼中における水素の挙動、及び水素による格子欠陥成長を、転位と空孔に関して明らかにした。水素脆化に及ぼす、水素による格子欠陥成長の影響についても調べた。水素存在下では、弾性応力範囲内においても、格子欠陥量は応力を負荷している時間とともにゆっくりと増大し、試料は脆性破壊する。弾性応力下でも、転位と水素の相互作用によって空孔が導入され、延性低下し、その影響は水素が抜けた後でも残存すると考えられる。以上のことから水素脆化において空孔の形成と蓄積が重要な要因であると結論できる。

Hydrogen behavior and hydrogen-enhanced lattice defect formation under elastic stress of tempered martensitic steel were clarified with respect to dislocations and vacancies by thermal desorption analysis (TDA) using hydrogen as a probe of defects and a positron probe microanalyzer (PPMA). The relationship between hydrogen embrittlement and lattice defects associated with hydrogen was also investigated. The amount of lattice defects increased gradually with increasing time of applied stress. The specimen fractured under elastic stress. The enhanced vacancies due to interactions between dislocations and hydrogen under elastic stress directly caused ductility loss. Even though hydrogen was completely removed by degassing the vacancies remain. Besides hydrogen content and applied stress, the time of formation and accumulation of vacancies are also concluded to be important factors causing hydrogen embrittlement.

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パーセンタイル:7.66

分野:Metallurgy & Metallurgical Engineering

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