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采用Gleeble 15 0 0热模拟机测定了H0 8Mn2SiA钢的临界点θAc1 ,θAc3以及θMs;通过测定不同温度下等温转变和不同冷却速度下连续冷却转变的膨胀曲线 ,结合金相组织观察和硬度测定 ,获得了该钢的等温转变曲线和连续冷却转变曲线 ;研究了其等温转变和连续冷却转变产物的组织形态 ,比较了所得曲线和同类转变曲线的差别 ,两者产生差别的原因主要是由于其化学成分、试样原始状态以及奥氏体化条件不同 .此外 ,确定了避免产生贝氏体组织的临界冷却速度为 0 .5 0℃ s ,为该钢的工艺制订和进一步加工提供了依据 .
The critical points θAc1, θAc3 and θMs of H0 8Mn2SiA steel were measured by Gleeble1500 thermal simulator. By measuring the expansion curves of the continuous cooling transformation under isothermal transformation and different cooling rates at different temperatures, combined with the microstructure observation and hardness measurement, The isothermal transformation curves and continuous cooling transformation curves of the steel were obtained. The isomorphic and continuous cooling transformation products were studied. The differences between the obtained curves and the same transition curves were compared. The differences between the two curves were mainly attributed to their chemical Composition, the original state of the sample and the austenitizing conditions.Furthermore, the critical cooling rate to avoid the formation of bainite was determined to be 0.50 ℃, which provided a basis for the formulation and further processing of the steel.