摘要
采用热压烧结(压力25 MPa,800~1100℃)及780℃×2 h再结晶退火工艺制备了具有优异性能的Ti-6Al-4V(TC4)合金。研究了Ti-6Al-4V合金相结构及随温度的变化规律,分析了不同热压烧结温度对Ti-6Al-4V合金的烧结致密度、微观组织及力学性能的影响。结果表明,Ti-6Al-4V合金从α相到β相转变的开始温度与结束温度分别为627℃和941℃。在800℃热压烧结没有实现烧结致密化,900℃热压烧结获得了较为均匀、细小的组织,1000℃及1100℃烧结均导致组织异常长大。在900℃烧结并退火处理的Ti-6Al-4V合金抗拉强度达到894.6 MPa,断后伸长率达到了15.7%,获得了极好的强度与塑性。
Ti-6Al-4V(TC4)alloy with excellent properties was prepared by hot pressing sintering at 800-1100℃under 25 MPa and recrystallization annealing at 780℃for 2 h.The phase structure of the tested alloy and its evolution with temperature were studied,and the effects of different hot pressing sintering temperatures on the sintering density,microstructure and mechanical properties were analyzed.The results show that the starting and finishing temperatures ofα→βphase transformation of the prepared Ti-6Al-4V alloy are 627℃and 941℃,respectively.The sintering densification cannot be achieved when sintering at 800℃.Uniform microstructure is obtained by sintering at 900℃,while sintering at 1000℃and 1100℃causes abnormal coarsening of the microstructure.By hot pressing sintering at 900℃+annealing,the tensile strength of the Ti-6Al-4V alloy reaches to 894.6 MPa,and the elongation after fracture reaches to 15.7%,the tested alloy obtains excellent strength and plasticity.
作者
李季
曹振
罗平
肖治同
李炯利
王旭东
Li Ji;Cao Zhen;Luo Ping;Xiao Zhitong;Li Jiongli;Wang Xudong(Beijing Institute of Graphene Technology,Beijing 100094,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Engineering Research Centre of Graphene Application,Beijing 100095,China;Beijing Research Institute of Mechanical and Electrical Technology Co.,Ltd.CAM,Beijing 100083,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第5期166-173,共8页
Heat Treatment of Metals
基金
北京市科技新星计划(Z191100001119102)
河北省科技冬奥专项(21471101D)。
关键词
TI-6AL-4V合金
热压烧结
烧结温度
相结构
力学性能
Ti-6Al-4V alloy
hot pressing sintering
sintering temperature
phase structure
mechanical properties
作者简介
李季(1993-),男,工程师,硕士,主要研究方向为高性能金属材料及表面改性技术,E-mail:lijiyjs@163.com;通讯作者:曹振,高级工程师,硕士,E-mail:caozhen917@163.com。
