熔模铸造成型的钛合金连接件的微观组织和拉伸性能  

Microstructure and Tensile Properties of Titanium Alloy Connector Formed by lnvestment Casting

作　　者：宗学文[1] 刘文杰 杨学东[2] ZONG Xuewen;LIU Wenjie;YANG Xuedong(College of Mechanical Engineering,Xi'an University of Science and Technology,Xian 710054,China;725th Research nstitute of China Shipbuilding Industry Corporation,Luoyang 471023,China)

机构地区：[1]西安科技大学机械工程学院,陕西西安710054 [2]中国船舶重工集团公司第七二五研究所,河南洛阳471023

出　　处：《热加工工艺》2020年第15期36-38,42,共4页Hot Working Technology

摘　　要：采用真空重力熔模铸造技术制备了TC4钛合金连接件铸件,借助光学显微镜(OM)、扫描电镜对其随炉试棒进行了组织观察,借助拉伸试验机对其强度进行了测量,并探讨了合金组织对性能的影响。结果表明:采用真空重力熔模铸造技术制备的连接件化学成分均匀分布,微观组织为魏氏组织,晶体分布均匀,晶间层状α相粗大,板条状α相取向一致,无缺陷存在。铸件的平均抗拉强度为920MPa,屈服强度为828.5MPa,伸长率为9.3%,力学性能符合GB/T6614-2014要求。The TC4 titanium alloy connection castings were prepared by vacuum gravity investment casting technology.The microstructure of the smaples with furnace was observed by means of optical microscope(OM)and scanning electron microscope(SEM).The strength of the alloy was measured with the help of tensile testing machine,and the influence of alloy microstructure on the properties was discussed.The results show that the chemical composition of the connectors prepared by vacuum gravity casting technology is uniformly distributed,the microstructure is Widmanstatten microstructure,the crystal distribution is uniform,the intergranular layeredαphase is coarse,the lathαphase orientation is consistent,and there are no defects.The average tensile strength of castings is 920 MPa,the yield strength is 828.5 MPa,the elongation is 9.3%,and the mechanical properties meet GB/T6614-2014 requirements.

关 键 词：连接件 TC4钛合金 元素分析 微观组织 拉伸性能 

分 类 号：TG249.5[机械工程—精密仪器及机械]