低ひずみ速度引張試験による低合金鋼の硫化物応力腐食割れ感受性の評価(<小特集>腐食防食小特集)

概要

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An application of slow strain rate tensile (SSRT) test to evaluation of sulfide stress cracking (SSC) susceptibility of low alloyed steel was investigated. A ductility loss parameter of I_L = (L_0 - L)/L_0 × 100% was used, where L_0 is the elongation to failure in air and L is that in H_2S containing media. The dependence of I_L on strain rate in the range of 10^<-4> to 10^<-7>s^<-1> was influenced by test temperature. I_L increased with decreasing strain rate below 50℃, while the maximum embrittlement was attained at 10^<-5>s^<-1> when the test was performed at 80℃. This phenomenon might suggest the importance of an interaction between dislocation and hydrogen. The ductility loss I_L showed a significant correlation with strength level and microstructure. I_L increased with increasing strength level, and the limiting strength, above which extremely poor ductility was obtained, became higher as the homogeneity of microstructure was improved. These behaviors were in good agreement with the results of conventional uniaxial tensile type SSC tests.
社団法人日本材料学会の論文
1988-01-15