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利用高分辨率Bhr DIL-805 A/D相变仪结合金相-硬度法研究了CLAM钢过冷奥氏体连续冷却转变曲线(CCT曲线)。根据实验数据测得了A_(c1),A_(c3),M_s和M_f点,以及得到了不同冷却速率连续冷却膨胀曲线。结果表明:当冷却速率小于2℃/min时,发生了铁素体转变,主要得到块状铁素体组织,渗碳体在铁素体边界富集,并且数量随着冷却速率的升高而增加;当冷却速率在3~5℃/min时,发生铁素体和马氏体转变,得到铁素体和马氏体组织;当冷却速率大于10℃/min时,只发生马氏体转变,得到完全马氏体组织。
The CCT curve of undercooled austenite in CLAM steel was studied by high resolution Bhr DIL-805 A / D phase change instrument and metallography-hardness method. According to the experimental data, the A_ (c1), A_ (c3), M_s and M_f points were measured and the continuous cooling expansion curves with different cooling rates were obtained. The results show that when the cooling rate is less than 2 ℃ / min, the ferrite transformation takes place, the bulk ferrite structure is mainly obtained, and the cementite is enriched on the ferrite boundary, and the number increases with the cooling rate , And the ferrite and martensite changes when the cooling rate is between 3 and 5 ° C / min to obtain ferrite and martensite. When the cooling rate is greater than 10 ° C / min, only martensitic transformation occurs , Get completely martensitic tissue.