SSRT 法による 500MN/m^2 級高張力鋼の電気防食条件下における引張性質と破壊挙動

概要

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Slow strain rate tensile tests were carried out on specimens of a high tensile structural steel (JIS SM50B) in 3.5%NaCl solution as a function of strain rate under freely corroding and cathodically polarized conditions. The main rasults obtained are as follows ; (1) A tendency of decrease in ductility was notable at potentials less than -850 mV(SCE) with strain rates less than 7×10^<-5> s^<-1>. This decrease in ductility was attributed to cathodically charged hydrogen induced cracking. (2) The hydrogen induced cracking resulted in formation of transgranular cracks and their crystallographic planes were found not to be cleavage but mainly parallel to {110} slip planes. (3) The hydrogen induced cracking was not observed under constant load condition in the range of cathodic potential studied, so it was suggested that the continuous plastic deformation played an important role for the hydrogen induced cracking to occur.
社団法人日本鉄鋼協会の論文
1985-02-01