昇温定荷重試験による 21/4Cr-1Mo 鋼の応力除去焼なまし割れの検討 : 低合金鋼の応力除去焼なまし割れ防止に関する研究(第 2 報)

概要

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An investigation was carried out on the effects of impurity contents and cooling time from 800℃ to 500℃ of weld thermal cycle on stress relief cracking susceptibility in 21/4 Cr-1 Mo steel synthesized HAZ. In this study, critical displacement to crack initiation (Δl'/c) and critical stress to crack initiation (σ_<SR>) obtained by constant loading test on heating in stress relief thermal cycle was adopted as a parameter to evaluate the stress relief cracking susceptibility. The results are summerised as follows; 1) Δl'/c decreased with increasing of X^^-=(10P+5Sb+4Sn+As)/100. 2) σ_<SR> at 600℃ on heating decreased with increasing of X^^-. 3) Δl'/c increased when the cooling time from 800℃ to 500℃ becomes shorter than 10 sec. and longer than 60 sec. In the former conditions austenite grain is refined and in the latter conditions upper bainite structure is formed.
社団法人溶接学会の論文
1982-01-05