応力除去焼鈍に関する研究(第 5 報) : HT 60 の応力除去焼なまし効果の推定について

概要

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On the basis of results shown in reports 1∿4,a method of predicting the reduction in residual stress due to stress relief heat treatment was studied. As the behaviour of welded part in stress relieving process is different from that of base metal, a proper method was applied individually for each part. Next, stress relieving process was divided into three stages, heating, holding and cooling. Estimation formulae were established for each stage besides cooling stage, in which stress drop was neglected. From these studies, the following findings are obtained. 1 Reduction of residual stress in the base metal part due to S. R. Treatment could be estimated from creep curves in transient region. 2 Reduction of residual stress in the welded part could be estimated from test results on HL specimen. 3 Estimated residual stress by the above method showed a little higher value than experimental value, especially for welded part. 4 Effect of heating rate became negligibly small after holding over 30 mimutes. Thus the stress drop in the heating stage is less-important when holding is made.
社団法人溶接学会の論文
1970-02-25