高強度鋼の水素誘起現象に及ぼす水素侵入方向の影響について

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To study the effects of hydrogen charging direction on the hydrogen phenomena and susceptibility to hydrogen embrittlement of SCM435, static bending tests, and observations of hydrogen blistering and hydrogen-induced cracking were carried out, and the plastic deformation on the specimen surface due to hydrogen introduction was investigated by X-ray diffraction technique. The main results obtained are summarized as follows; (1) The hydrogen blistering was observed in the case of hydrogen charging perpendicular to the rolling direction not only on low strength steels but also on high strength level steels having tensile strength up to 1 200 Mpa. On the other hand, in the case of hydrogen charging parallel to the rolling direction, no hydrogen blistering appeared in all specimens. (2) It was found that the susceptibility to hydrogen embrittlement depended on the strength level of material and was affected by the hydrogen charging direction in the case of materials sensitive to hydrogen such as those tempered at 300℃ and 400℃. (3) From the measurements of half-value breadth and residual stress by X-ray diffraction, it was estimated that the values of plastic deformation due to hydrogen dissolution for the specimens tempered at 500℃ and 600℃ and the annealed specimen were about 0.8%, 1.2% and 2.2%,respectively, while those of the specimens tempered at 300℃ and 400℃ were within 0.5%. (4) Hydrogen-induced cracking initiated around the nonmetallic inclusions (MnS) or micro-segregation bands and grew parallel to the rolling direction. Their fracture morphology was quasi-cleavage fracture such as river like pattern.
社団法人日本材料学会の論文
1985-02-15

高強度鋼の水素誘起現象に及ぼす水素侵入方向の影響について

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