通过TC18钛合金热模拟压缩实验,得到不同变形条件下的高温变形真应力-真应变曲线.通过加工硬化和动态软化效应,分析变形参数变化对TC18钛合金应力-应变曲线形态和峰值应力的影响.不同变形条件下,TC18钛合金流变曲线呈现出相似的特征,而峰值应力对变形参数的变化却十分敏感.通过Poliak-Jonas准则,分析了不同条件下TC18钛合金在高温变形过程中的软化机制.相同温度下,动态再结晶机制主要发生在低应变速率下的高温变形过程中,并且软化机制的选择对温度不敏感.基于传统的Arrhenius型方程,针对TC18钛合金热变形过程中不同的软化机制,分别建立动态再结晶和动态回复机制下的本构方程.针对识别出的TC18合金在不同变形条件下的软化机制,通过适用的本构模型来描述TC18合金在应变为0.7时真实应力对变形温度、应变速率的响应过程.以动态再结晶为主要软化机制的变形过程,其变形激活能和应变速率敏感系数远远大于以动态回复为主的过程.
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