鋼の再熱割れに関する基礎的研究(第 6 報) : 粒界き裂発生応力に及ぼす粒径の影響

概要

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The effects of grain size and impurity elements on an intergranular crack initiation stress at 600℃ were investigated to clarify the mechanism of reheat cracking. Two kinds of steels were used, one was crack sensitive A387-12,the other one was insensitive A533B-Class 1. The results obtained in this study are as follows; 1) There is a linear relationship between intergranular crack initiation stress at 600℃ and inverse square root of grain size. The stress increases with decreasing grain size. 2) In case of same grain size, the stress decreases with increasing content of phosphorus or antimony. 3) Phosphorus or antimony influences the effective surface energy to nucleate or propagate intergranular crack. The energy is lowered by increasing content of phosphorus or antimony.
社団法人溶接学会の論文
1981-11-05