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基于热模拟试验机上单道次热压缩试验,通过控制变形温度、变形程度和冷却速率研究了40Cr钢的热变形行为及变形后的连续冷却过程。利用二值化处理和中值滤波处理技术获得了不同实验参数下的铁素体含量。结果表明,变形程度增大加速奥氏体分解,提高相变组织中铁素体含量,变形程度影响效果较强且基本不受冷却速率影响;变形温度降低促进奥氏体向珠光体转变,但影响效果对冷却速率变化比较敏感。
Based on the single-pass sub-thermal compression test on the thermal simulator, the deformation behavior and the continuous cooling process of 40Cr steel were studied by controlling the deformation temperature, the degree of deformation and the cooling rate. The ferrite content under different experimental parameters was obtained by binary and median filtering techniques. The results show that the deformation degree increases to accelerate the austenite decomposition and improve the ferrite content in the phase transformation microstructure. The effect of the deformation degree is strong and basically unaffected by the cooling rate. The decrease of the deformation temperature promotes the transformation from austenite to pearlite, The effect is sensitive to changes in cooling rate.