水素発生電位下におけるSUS430ステンレス鋼の低ひずみ速度引張試験 : カソード電位の保持時間の影響

概要

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In the previous paper, the holding time was found to be an influencing factor for the hydrogen embrittlement of stainless in 3% NaCl solution. In this study, in order to elucidate the relation between the cathodic potential and mechanical properties, the slow strain rate tension tests were held for various time periods in hydrogen evolution potential. (1) The embrittlement ratio obtained from the reduction of area decreased continuously with in creasing holding time in each setting potential. This tendency became more pronounced at lower setting potential. Consequently, although the contraction of specimen decreased only slightly in every direction, a remarkable embrittlement phenomenon could be found. The same results were also obtained for the time to fracture. (2) The degradation of mechanical properties accompanied with the hydrogen embrittlement was also noticed in the rupture behavior or the observation of fracture surface by S. E. M. . In particular, the results observed by S. E. M. indicated that the transgranular fracture including quasi-cleavage fracture increased in the outside region of specimen and the dimple caused by ductile fracture decreased in the inside region of specimen.
社団法人日本材料学会の論文
1988-02-15