高張力鋼の水素ぜい化挙動と水素含有量との関係

概要

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The relationship between hydrogen embrittlement behavior and hydrogen content was studied on SCM 435 steel by employing the technique of fracture mechanics. The hydrogen content of specimen, which was measured with a modified electrochemical technique, was varied by using different electrolytes and additives as well as by changing cathodic polarization. The specimens used had different tensile strength, prior austenite grain size and thickness. An increase of hydrogen content caused a decrease of K_<ISCC> and an increase of crack growth rate at stage II, (da/dt)_<II>. In the range of tensile strength from 150 to 180kg/mm^2, log-log plots of hydrogen content against K_<ISCC> or (da/dt)_<II> showed a linear relation. It was concluded that both K_<ISCC> and (da/dt)_<II> were determined only by the hydrogen content and were independent of the composition of electrolyte or cathodic polarization.
社団法人日本材料学会の論文
1983-10-15