基于新型亚稳β钛合金Ti2448在温度范围为1023～1123 K,应变速率范围为63.000～0.001 s-1的等温热压缩流动应力曲线特征,采用经典的应力-位错密度关系式和动态再结晶动力学模型构建了完整描述亚稳β钛合金热变形流动应力与应变、应变速率和变形温度关系的本构模型.位错密度变化方程和Avrami方程被用来分别描述合金在高(≥1s-1)低(＜1 s-1)应变速率下呈现的动态回复(DRV)和动态再结晶(DRX)两种不同的变形机制.最终通过应用全局优化求解非线性方程的新方法确定本构模型中的相关参数.根据本文所建模型得到的预测曲线和实验曲线吻合较好,能够有效预测Ti2448在热变形过程中的流动应力,为构建亚稳β钛合金热变形本构模型提供一种有效方法.
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