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高張力 鋼材의 急速入熱後 冷却速度에 따른 組織 및 硬度變化의 硏究
裵且憲,金雨烈,玉英建 釜山工業大學校 1982 論文集 Vol.23 No.2
The weld heat-affected zone of high strength steel was studied and then temperature range is from 1350℃ to 1400℃ Experiment was conducted about high strength steel, SM 58. Their structural and hardening properties were observed by rapid heating and cooling. The results obtained are as follows: 1) The structure was changed by rapid heating above 1350℃ and cooling. That is, the anisotropic structure before rapid heating became isotropic structure after cooling. 2) When the cooling temperature range was from 800℃ to 500℃ and cooling rate range was from 1.6℃/sec to 4.3℃/sec, structures changed were similar each other, but except 23℃/sec. 3) The hardness value had Hv from 190 to 230 when the heating temperature was from 800℃ to 500℃ and cooling rate was changed from 1.6℃/sec to 4.3℃/sec, but for 23℃/sec, vickers hardness had the value from 410 to 430.