锻态TB6钛合金热变形行为及组织演变  

Investigation on the hot temperature deformation behavior and microstructure evolution of forged titanium alloy TB6

作　　者：邱伟[1] 鲁世强[1] 欧阳德来[1] 余兴强[1] 黄旭[2] 雷力明[2] 

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063 [2]北京航空材料研究院,北京100095

出　　处：《塑性工程学报》2010年第3期38-43,共6页Journal of Plasticity Engineering

基　　金：国家重点基础研究发展计划资助项目(2007CB613803);航空科学基金资助项目(2009ZE56014);江西省自然科学基金资助项目(2008GZC0041);江西省教育厅科技资助项目(GJJ08203);南昌航空大学研究生科技创新基金资助项目(YC2007001)

摘　　要：在THERMECMASTER-Z型热模拟试验机上,对锻态TB6钛合金在真应变为0.92、变形温度为800℃～1150℃、应变速率为0.001s-1～1s-1的条件下进行等温恒应变速率压缩试验,分析合金在β单相区条件下的热变形特点,并观察金相组织。结果表明,应变速率对合金流动应力的影响较显著;而变形温度对合金流动应力的影响在较高应变速率时较大,在较低应变速率时较小。动态再结晶晶粒尺寸和动态再结晶体积分数,随温度的升高而增大,随应变速率的增大而减小。从晶粒细化和动态再结晶组织均匀性考虑,当真应变为0.92时,变形温度选择在950℃～1050℃之间,应变速率选择在0.01s-1为宜。Isothermal constant strain rate compression tests for forged TB6 alloy at 800℃～1150℃ with strain rate 0.001s-1～1s-1 were conducted up to a true strain of 0.92 adopting THERMECMASTER-Z hot temperature simulator.The characteristics of hot deformation and microstructure of the alloy were studied at the β phase field.The results show that the strain rate affects flow stress obviously;while the effect of deformation temperature on flow stress is more obvious at high strain rate than that at low strain rate.The grain size and volume fraction of dynamic recrystallization increase with the increase of temperature,whereas decrease with the increase of strain rate.According to the effect of grain refinement and uniformity in the dynamic recrystallization microstructure,the deformation temperature 950℃～1050℃ and the strain rate 0.01s-1 are preferable for hot deformation.

关 键 词：锻态TB6钛合金 变形温度 应变速率 流动应力 显微组织 

分 类 号：V252[一般工业技术—材料科学与工程] TG311[航空宇航科学与技术—航空宇航制造工程]