基于热力耦合的42CrMo支撑座成形动态再结晶模拟分析
Numerical Simulation on Dynamic Recrystallization in Supporting Pedestal Forging of 42GrMo Based on Thermal-mechanical Coupling
周 杰， 邱媛媛， 王熠昕
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作者单位：重庆大学 材料科学与工程学院，重庆400044
中文关键字：支撑座； 热力耦合； 动态再结晶； 数值模拟
英文关键字：supporting pedestal; thermal coupling; dynamic recrystallization; numerical simulation
中文摘要：在综合考虑了成形、热传导、产热及动态再结晶的情况下，采用了刚粘塑性有限元与动态再结晶演化热力耦合的方法，建立了宏观与微观相结合的工艺模型，对42CrMo钢支撑座进行了锻造过程变形和动态再结晶的热力耦合模拟。结果表明：在宏观上，支撑座制件成形良好；从微观角度分析，晶粒尺寸介于18.6～22.1 μm的金属所占体积百分比最大，为28.962%；约有67.244%的金属发生了完全动态再结晶。此外还分析了该锻件的一个重要受力截面，该截面内部晶粒尺寸较锻件顶部与底部的晶粒尺寸略大些，这是由于内部长时间高温使得晶粒二次长大。
英文摘要：Combining formation, heat transfer, heating generation and dynamic recrystallization, a rigid visco-plastic finite element method and dynamic recrystallization coupled thermo-mechanical method was adopted to set up a macro-micro coupled model, and the deformation and dynamic recrystallization of the thermo-mechanical coupling in the forming process for 42CrMo supporting pedestal was simulated. The results show that the supporting pedestal is formed well at macro level; at micro-level, the grains in 18.6～22.1 μm take up the most percentage, which is 28.962%; about 67.244% metal get a complete dynamic recrystallization in the forming process. Meanwhile, an important force's cross-section is analyzed, it is showed that the size of the internal grain is larger than that of the top and bottom zone, the reason is that a long time internal heat makes the grain grow secondly up.