摘要
为揭示热处理对TC4钛合金动态力学性能及微观组织的影响,选取2种典型热处理方式和5种加载应变率开展了TC4钛合金试样的动态力学性能实验,获取了动态应力-应变数据,并进行了试样的XRD和金相分析。结果表明:高应变率下TC4钛合金应变率强化效应显著。时效处理后,TC4钛合金流动应力、屈服强度及抗压强度得到提升,而固溶时效处理后上述性能降低。时效处理和未热处理试样应力-应变曲线均具有弹性、屈服和塑性阶段,而固溶时效处理后无明显弹性和屈服阶段。固溶时效处理后流动应力随应变率增加而增加,时效处理和未热处理试样流动应力无明显变化。时效处理后试样等轴初生α相显著增大且β相含量较低,固溶时效处理后α相晶界增大且含有针状α的β转变基体,TC4钛合金力学性能与β相和亚稳β相的马氏体转变有关。
In order to reveal the effects of heat treatment on the dynamic mechanical properties and microstructure of TC4 titanium alloy,two typical heat treatment methods and five strain rates were selected to carry out the dynamic mechanical properties experiments of TC4 titanium alloy specimens.The dynamic stress-strain data were obtained,and XRD and metallographic analyses of the specimens were conducted.Results show that the strain rate strengthening effect of TC4 titanium alloy is significant at a high strain rate.After aging treatment,flow stress,yield strength and compressive strength of TC4 titanium alloy are improved,while the above-mentioned properties are reduced after solution aging treatment.The stress-strain curves of both aged and untreated specimens exhibit elastic,yield and plastic stages,while there are no obvious elastic or yield stages after solution aging treatment.After solution aging treatment,the flow stress increases with the increase of strain rate,and there is no significant change in the flow stress of the aged and untreated specimens.After aging treatment,the equiaxed primaryαphase of the specimen increases significantly and the content ofβphase is low.After solution-aging treatment,the grain boundary ofαphase increases andβmatrix containing needle-likeαappears.The mechanical properties of TC4 titanium alloy are related to the martensitic transformation ofβphase and metastableβphase.
作者
刘涛
柏威
吴乔国
孙虹
雷经发
LIU Tao;BAI Wei;WU Qiaoguo;SUN Hong;LEI Jingfa(School of Mechanical and Electrical Engineering,Anhui Jianzhu University,230601 Hefei,China;Anhui Province Key Laboratory of Human Safety,230601 Hefei,China;School of Civil Engineering,Hefei University of Technology,230009 Hefei,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2023年第4期805-813,共9页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金资助项目(No.51805003)
安徽省高校优秀拔尖人才培育资助项目(No.gxyqZD2019057)
灾害环境人员安全安徽省重点实验室开放课题资助项目(No.DEPS-2021-02)。
关键词
TC4钛合金
固溶处理
时效处理
动态力学性能
金相组织
TC4 titanium alloy
solution treatment
aging treatment
dynamic mechanical property
metallographic structure
