OS2204 弾性応力下における高強度鋼中の水素起因格子欠陥の形成促進と水素脆化(OS22-2 水素と材料ミクロ挙動,OS-22 水素環境の材料強度特性への影響)

概要

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The lattice defect formation behavior associated with hydrogen under elastic tensile stress of tempered martensitic steel was examined from the viewpoint of dislocation and vacancy. In addition, the relationship between hydrogen embrittlement and lattice defects associated with hydrogen was investigated. In the early stage of applying elastic stress, the amount of lattice defects decreased, and then increased gradually with time of applied stress. The most probable reason for the decrease in the amount of lattice defects is due to dislocation annihilation and rearrangement of dislocation structure. In contrast, the increase in the amount of lattice defects can be assigned to the increase in the amount of vacancy clusters. The vacancy clusters enhanced by hydrogen and elastic stress cause ductility loss of the steel, even though hydrogen is not present in tensile test. Therefore, not only hydrogen but also the vacancy clusters are concluded to be important factor causing hydrogen embrittlement.
一般社団法人日本機械学会の論文
2011-07-16