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研究了连续空冷冷却速度、等温温度对新型中高碳Mn-B系贝氏体钢组织的影响规律,测试了其连续空冷及等温转变(CCT及TTT)整体动力学曲线。与TTT曲线相比,CCT高温珠光体转变曲线明显右移,而中温贝氏体转变及低温马氏体转变曲线位置几乎不变。此外,观察了不同冷却系条件及等温温度下,试验合金的金相组织。结果表明,试验合金具有优良的淬透性,在空冷条件下可获得贝氏体和马氏体复相组织。
The effect of continuous cooling rate and isothermal temperature on the microstructure of a new type of medium-carbon Mn-B bainitic steel was studied. The overall kinetic curves of continuous air cooling and isothermal transformation (CCT and TTT) were tested. Compared with the TTT curve, the CCT high temperature pearlite transformation curve shifted to the right, while the mid-temperature bainite transformation and the low-temperature martensite transformation curve almost unchanged. In addition, the microstructure of the test alloy was observed under different cooling conditions and isothermal temperature. The results show that the experimental alloy has excellent hardenability, bainite and martensite duplex structure can be obtained under air-cooled conditions.