【摘要】 用热模拟试验机、光学显微镜、MATLAB软件研究了双态组织Ti80合金在变形温度860～1020℃、应变速率0.001～10 s-1、最大变形量50%下的热变形和热加工特性。结果表明:Ti80合金为负温度敏感型、正应变速率敏感型材料,主要软化机制随温度的升高由动态再结晶转变为动态回复。利用MATLAB编程构建了应变补偿本构方程与热加工图,计算应力与试验应力的相关系数R=0.994、平均相对误差AARE=7.443%;合金最佳热加工工艺参数区间为:温度980～1015℃、应变速率-0.013～0.100s^-1,该区峰值功率耗散系数h=64%。更多还原

【Abstract】 The thermal deformation behavior and heat processability of Ti80 alloy with bimodal microstructure was investigated in temperature range of 860 ～ 1020 ℃ and strain rate range of 0.001 ～ 10 s^-1 with the maximal deformation of 50% by hot simulator, optical microscope and MATLAB software. Results show that the Ti80 alloy is negative temperature and positive strain rate sensitive material.Main softening mechanism changes from dynamic recrystallization to dynamic recovery when the temperature increases. In addition, the strain compensation constitutive equation and processing map were constructed by MATLAB programming. Correlation coefficient R between the predicted value and the experimental value of constitutive equation is 0.994, and average relative error AARE is 7.443%. The optimum processing parameter interval of Ti80 alloy is（980 ～ 1015 ℃） in temperature and（0.013 ～ 0.100 s-1） in strain rate, in which the peak of power dissipation h is 64%.更多还原