基于热力耦合的塑性成形动态再结晶仿真分析
Simulation Model of Hot Forming Based on Multi-Factor Dynamic-coupling and Application
权国政1，刘克威1，周 杰1，陈 斌2
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作者单位：（1. 重庆大学 材料科学与工程学院，重庆 400044；2. 重庆大学 资源及环境科学学院，重庆400044）
中文关键字：耦合；再结晶；镦粗；临界应变
英文关键字：coupling; recrystallization; upsetting; critical strain
中文摘要：解析了微观组织演化模型与有限元传热变形相互耦合的理论方法，利用Deform软件建立了考虑材料变形、传热、生热、动态再结晶、静态再结晶、亚动态再结晶、晶粒生长等多因素的耦合计算模型。以规格?准35 mm × 70 mm的In718棒坯镦粗70%、冷却5 s为实际算例，定义了In718流动应力模型、组织演化模型，对热塑性变形、空冷过程中动态、静态、亚动态再结晶的晶粒尺寸、体积分数及发生的时机等进行了有效预测。
英文摘要：The theory methods of the microstructure evolution models coupled with heat transfer and deformation FEM were resolved. A multifactor coupled thermal-mechanical computation model considering the deformation, heat transfer, heat generation, dynamic recrystallization, static recrystallization, sub-dynamic recrystallization, grain growth was set up based on software Deform. A simulation example was carried out as upsetting seventy percent of In718 billet height, and then air-cooling 5 s. The flow stress model and microstructure evolution models of In718 were defined. The grain size, volume fraction and arising timing of dynamic, static and sub-dynamic recrystallization during forming and cooling process was forecasted effectively.