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采用计算机模拟40Cr钢冷却过程中的CCT曲线和TTT曲线并预测其组织分布状态,最后采用硬度测试、OM和SEM等对其组织进行分析并对计算机模拟结果进行验证。结果表明,当电机转速为350 r/min时,试验钢表层组织由奥氏体向贝氏体转变,心部组织由奥氏体向马氏体和贝氏体转变;当转速为550 r/min时,试件表层已经全部转变为马氏体;随着离表层距离的增加,试验钢硬度降低,且硬度分布曲线与计算机预测结果一致。
The CCT curve and TTT curve during the cooling process of 40Cr steel were simulated by computer and the distribution of the structure was predicted. Finally, the hardness and OM and SEM were used to analyze the microstructure and the computer simulation results. The results show that when the motor speed is 350 r / min, the microstructure of the test steel changes from austenite to bainite and the heart tissue changes from austenite to martensite and bainite. When the rotating speed is 550 r / min, the specimen surface layer has all been transformed into martensite; with the distance from the surface increases, the hardness of the test steel decreases, and the hardness distribution curve and the computer prediction results.