鉄の水素ぜい化に及ぼす負荷応力および冷間加工の影響

概要

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The effects of applied stress and work on the hydrogen embrittlement of iron have been examined by constant load tests under cathodic charging. The results obtained are summerized follows. (1) Hydrogen embrittlement of the annealed iron specimen was induced by applying a stress higher than the yield one. This result indicates that the mobile dislocations play an important role for hydrogen embrittlement of annealed iron. (2) With the prestrained iron specimen, hydrogen embrittlement occurred even at an applied stress less than the yield one. This result means that the dislocations induced by preplastic deformation play an important role for hydrogen embrittlement of prestrained iron. (3) The quasi-cleavage fracture which was characterized by petal-like pattern was recognized on both annealed and prestrained iron. In this case, the average diameter of facets decreased with increasing prestrain. On the other hand, the density of facets increased with increasing prestrain. It is suggested that the inclusions and the dense regions of dislocations contribute to the susceptible nucleus for hydrogen cracking.
社団法人日本材料学会の論文
1985-09-15