摘要
为研究Ti-5553合金在高应变率载荷下的动态响应和微结构变化,利用分离式霍普金森压杆(SHPB)和霍普金森拉杆(SHTB)装置对Ti-5553合金分别进行单纯SHTB加载和SHPB+SHTB加载,采用光学显微镜和扫描电子显微镜对加载后的试样进行观察,分析其显微组织和断口形貌,并结合定量金相分析方法进行相关计算。结果表明:SHPB加载和SHTB加载均会使Ti-5553合金发生应力诱发马氏体相变;Ti-5553合金在SHPB加载发生应力诱发马氏体相变之后再进行SHTB加载时,发生应力诱发马氏体相变的能力受到抑制;Ti-5553合金在SHPB加载后,材料的变形抗力降低,SHPB加载后再采用SHTB加载与单纯SHTB加载相比,材料的塑性变差、抗拉强度降低。
In order to study dynamic response and microstructure evolution under high-strain-rate load,the dynamic mechanical performance of near-β Ti-5553 titanium alloy respectively loaded by Split Hopkinson Pressure Bar（SHPB）and Split Hopkinson Tensile Bar（SHTB）was studied. The microstructures were characterized by optical microscopy（OM）,scanning electron microscope（SEM）and quantitative metallographic method. The experimental results demonstrate that stress-induced martensite is generated in Ti-5553 titanium alloy both loaded by SHPB and SHTB. The transformation of stress-induced martensite in Ti-5553 titanium alloy is restricted when stress-induced martensite already exists after SHPB loading. Compared with Ti-5553 titanium alloy loaded only by SHTB,the alloy firstly loaded by SHPB and then by SHTB exhibits poorer plasticity and lower tensile strength.
作者
代华湘
王琳
王丁
刘安晋
DAI Huaxiang WANG Lin WANG Ding LIU Anjin(School of Materials Science and Engineering, National Key Laboratory of Science and Technology on Materials in Impact Environment, Beijing Institute of Technology, Beijing 100081, China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2017年第1期84-88,共5页
Ordnance Material Science and Engineering
基金
冲击环境材料技术国家级重点实验室项目基金
关键词
钛合金
分离式霍普金森压杆
分离式霍普金森拉杆
应力诱发马氏体
定量金相
titanium alloy
Split Hopkinson Pressure Bar
Split Hopkinson Tensile Bar
stress-induced martensite
quantitative metallography
