王天祥,鲁世强,王克鲁,欧阳德来,姚泉.Ti60合金的热变形行为及工艺参数优化[J].稀有金属材料与工程,2020,49(10):3552~3561.[Wang Tianxiang,Lu Shiqiang,Wang Kelu,OUYANG Delai,Yao Quan.Hot deformation behavior and process parameter optimization of Ti60 alloy[J].Rare Metal Materials and Engineering,2020,49(10):3552~3561.]
Ti60合金的热变形行为及工艺参数优化
投稿时间:2019-10-31  修订日期:2019-12-10
中文关键词:  Ti60合金  流动应力行为  应变速率敏感指数  应变硬化指数  加工图
基金项目:国家自然科学基金资助(51964034,51761029)江西省研究生创新基金(YC2018-S365)
中文摘要:
      在变形温度600~950℃,应变速率0.001~10s-1条件下,采用Thermecmaster-Z型热加工模拟试验机对Ti60合金进行等温恒应变速率压缩实验。通过分析流动应力行为,计算应变速率敏感指数m和应变硬化指数n,并综合考虑加工图和变形微观组织来研究该合金的热变形行为,得到优化的工艺参数范围。研究结果表明,Ti60合金的流动应力-应变曲线在不同热力参数条件下分别呈现流动稳态型和流动软化型。应变速率敏感指数m随着变形温度升高和应变速率降低而增大。应变硬化指数n随着变形温度升高而减小;随着应变速率的增加在低应变速率(0.001~0.1s-1)区间增大,在高应变速率(1~10s-1)区间减小;随着应变的增加在高温段(800~950℃)的低应变速率(0.001~0.1s-1)区间较缓慢地减小,在高温段(800~950℃)的高应变速率(1~10s-1)区间以及低温段(600~750℃)的所有应变速率(0.001~10s-1)区间较明显地减小。Ti60合金存在两个功率耗散效率峰值区域,其对应的热力参数窗口分别为温度725~875℃,应变速率≤0.003s-1和温度875~938℃,应变速率≤0.04s-1。从流动应力行为、应变速率敏感指数m、应变硬化指数n以及加工图综合考虑,Ti60合金的最佳热加工工艺参数为:温度800~875℃,应变速率0.001~0.003s-1,或温度875~938℃,应变速率0.001~0.04s-1
Hot deformation behavior and process parameter optimization of Ti60 alloy
英文关键词:Ti60 alloy  Flow stress behavior  Strain rate sensitive exponent  Strain hardening exponent  Processing map
英文摘要:
      The isothermal compression tests of Ti60 alloy were conducted on the Thermecmaster-Z thermal simulator at deformation temperature of 600~950℃, strain rate 0.001~10s-1. The hot deformation behavior of Ti60 alloy were investigated, by analyzing the flow stress behavior, calculating the strain rate sensitive exponent m and strain hardening exponent n, along with the processing map and deformation microstructure, to optimize processing parameter. The results show that the flow stress-strain curve of Ti60 alloy presents flow steady state and flow softening respectively at different processing parameters. The strain rate sensitivity exponent m increases with the increase of deformation temperature and decrease of strain rate. The strain hardening exponent n decreases with the increase of deformation temperature. With the increase of strain rate, n increases in the low strain rate (0.001~0.1s-1) and decreases in the high strain rate (1~10s-1). With the increase of strain, n decreased slowly at the low strain rate (0.001~0.1s-1), the high temperature (800~950℃), while which decreased significantly at the high strain rate (1~10s-1) , the high temperature section (800~950℃) and all the strain rates (0.001~10s-1), the low temperature (600~750℃). Ti60 alloy has two peak power dissipation efficiency regions, whose corresponding processing parameter Windows : temperature 725~875℃, strain rate ≤0.003s-1 and temperature 875~938℃, strain rate ≤0.04s-1, respectively. Considering the flow stress behavior, strain rate sensitivity exponent m, strain hardening exponent n and processing map, the optimal thermal processing parameters of Ti60 alloy: temperature 800~875℃, strain rate 0.001~0.003s-1, or temperature 875~938℃, strain rate 0.001~0.04s-1.
作者单位E-mail
王天祥 南昌航空大学 1196218949@qq.com 
鲁世强 南昌航空大学  
王克鲁 南昌航空大学  
欧阳德来 南昌航空大学  
姚泉 南昌航空大学  
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