Effect of Residual Hydrogen Content on Cold Crack Susceptibility in Weld Metal of High Strength Steels

概要

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Recently, the lower critical stress in the Implant test of high strength steel has been approximately correlated with residual hydrogen content at temperature 100℃, which seemes to relate with HAZ cracking more closely than initial hydrogen content, independently of initial hydrogen content and preheating temperature. In this investigation, the residual hydrogen content at 100℃ was measured by means of gas chromatograph in the LB-TRC test specimen in which the susceptibility of weld metal cold cracking could be quantitatively evaluated, and the relationship between the residual hydrogen content and the lower critical stress in the LB-TRC test was investigated using HT60, HT80, HY130 and HY180. Consequently, the experimental equations between (ΣDΔt)_<100> and the residual hydrogen content of all materials used were deduced, respectively. The lower critical stress strongly depended on the residual hydrogen content at 100℃ in weld metal than the total amount of residual hydrogen content at 100℃.
大阪大学の論文