人工海水中でのSNCM439鋼の水素ぜい化割れに及ぼす水素含有量の影響

概要

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The relationship between the threshold stress intensity (K_<ISCC>) and hydrogen content in SNCM 439 steel subjected to various heat-treatments was examined. K_<ISCC> was obtained from the compact tension (CT) and wedge opening loading (WOL) type specimens immersed in artificial sea water. The hydrogen content in the steel was measured by an electrochemical method (Ni-plating method). The results showed that the diffusion coefficient of hydrogen decreased and the hydrogen content increased with increasing yield strength of steel. K_<ISCC> decreased with increasing hydrogen content,but the relationship between K_<ISCC> and hydrogen content became different at the yield strength of 1275 MPa. This phenomenon was discussed in relation to metallographic observation of the fractured surface of steel.
社団法人日本材料学会の論文
1986-10-15