Ti-55511合金热变形行为及组织演变研究  

Study on thermal deformation behavior and microstructure evolution of Ti-55511 alloy

作　　者：牟芃威 吕书锋 杨培杰 康煦东 杜赵新[3] Mu Pengwei;LüShufeng;Yang Peijie;Kang Xudong;Du Zhaoxin(College of Science,Inner Mongolia University of Technology,Hohhot 010051,Inner Mongolia,China;China North Rare Earth(Group)Hi-tech Co.,Ltd.,Baotou 014060,Inner Mongolia,China;College of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,Inner Mongolia,China)

机构地区：[1]内蒙古工业大学理学院,内蒙古呼和浩特010051 [2]中国北方稀土(集团)高科技股份有限公司,内蒙古包头014060 [3]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051

出　　处：《钢铁钒钛》2023年第5期61-67,共7页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金项目(12172182,52071185);内蒙古自治区直属高校基本科研业务费项目(JY20220086);国家级大学生创新创业训练项目(202210128005)。

摘　　要：通过等温热压缩模拟方法在温度为700~950℃和应变速率为0.001~10 s^(-1)的工艺下研究了Ti-55511合金的热变形行为。结果表明,合金的软化机制对热加工参数的变化很敏感,在高应变速率及低变形温度的匹配下,合金因动态回复/再结晶所造成的软化行为在与形变硬化的竞争中占据主导地位,表现为流变应力的降低。此外,再结晶软化与形变硬化在高变形温度与低应变速率的匹配下达到平衡状态。对比功率耗散因子(η)可以发现,低应变速率条件下的η值较高,组织分布较为均匀,热加工性能良好。The thermal deformation behavior of Ti-55511 alloy was studied by isothermal compression simulation method at the temperature of 700~950℃and strain rate of 0.001~10 s^(-1).The results show that the softening mechanism of the alloy is very sensitive to the change of hot working parameters.Under the matching of high strain rate and low deformation temperature,the softening behavior of the alloy caused by dynamic recovery/recrystallization plays a dominant role in the competition with deformation hardening,which is manifested as the reduction of flow stress.In addition,recrystallization softening and deformation hardening reach an equilibrium state under the matching of high deformation temperature and low strain rate.By contrast,the power dissipation factor(η)is higher under the condition of low strain rate,the microstructure distribution is more uniform,and the thermal processing ability is good.

关 键 词：Ti-55511合金 热压缩模拟 显微组织 回复再结晶 热加工性能 

分 类 号：TF823[冶金工程—有色金属冶金] TG146.2[一般工业技术—材料科学与工程]