鋼の再熱割れに関する基礎的研究(第 2 報) : 切欠底部の塑性変形能におよぼす P の影響

概要

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In this report, the effect of P on the critical crack opening displacement at the tip of notch (φ_c) in HT 80 steel was investigated in detail. The experimental results obtained in this study are as follows; 1) φ_c at 600℃ of synthetic bond depends on P content in the range of cooling time from 800℃ to 500℃ being 10 sec to 50 sec. φ_c at 600℃ decreases and intergranular cracking ratio becomes larger with increasing P content from 0.018% to 0.074%. 2) φ_c at 600℃ of synthetic bond decreases sharply when heating time from 450℃ to 600℃ becomes 15min. However, decreasing tendency of φ_c at 600℃ becomes slow when the heating time is longer than 15min. On the same heating conditions, φ_c at 600℃ decreases with increasing P content from 0.008% to 0.097%. Synthetic bond (0.008% P) heated from 450℃ to 600℃ for 3 sec fractured in the grain interior. However, intergranular cracking ratio becomes larger with increasing heating time. 3) In HT 80 steel, P segregates to grain boundaries during heating to 600℃ after affecting synthetic weld thermal cycle and as a result, intergranular cracking at reheating temperature is promoted.
社団法人溶接学会の論文
1978-07-05