电子束熔丝成形的TC4钛合金的组织与性能研究  

Microstructure and Properties of TC4 Titanium Alloy Manufactured by Electron Beam Rapid Manufacturing

作　　者：黄志涛[1] 巩水利[1] 锁红波[1] 董伟[1] 杨帆[1] 杨光[1] Huang Zhitao Gong Shuili Suo Hongbo Dong Wei Yang Fan Yang Guang(Beijing Aeronatical Manufacturing Technology Research Institute, Beijing 100024, China)

机构地区：[1]中航工业北京航空制造工程研究所,北京100024

出　　处：《钛工业进展》2016年第5期33-36,共4页Titanium Industry Progress

基　　金：国家预研基金资助项目(51318030203)

摘　　要：研究了采用电子束熔丝成形(EBRM)技术制造的TC4钛合金件的组织特征及力学性能,结果表明:经EBRM技术得到的TC4钛合金件宏观组织为异常粗大的β柱状晶。经热处理后,显微组织由片状初生α相、β转变组织及晶界α相组成;室温拉伸性能呈现明显的各向异性,但各方向的强度和塑性均满足AMS 4999A—2011标准要求,其中,x、y向抗拉强度与自由锻件实测水平相当;室温冲击韧度达到70 J/cm2,约为自由锻件及铸件实测值的两倍;光滑试样轴向加载高周疲劳性能优于经β热处理的锻件;轴向加载低循环应变疲劳性能与锻件相当,但优于铸件。TC4 titanium alloy part was prepared by electron beam rapid manufacturing （EBRM） method, and the microstructure and mechanical properties of EBRM TC4 titanium alloy part was studied. The results show that TC4 titanium alloy part exhibits large columnar fl grains, and the microstructure is made of primary a phase, transformation microstructure and grain boundary α phase after heat treatment. The tensile properties have anisotropy obviously, but the strength and ductility in all directions can meet the standard requirements of AMS 4999A-2011. The tensile strength in x and y directions can meet the measured level of TC4 titanium alloy forging. The roomtemperature impact toughness is 70 J/cm2, which is about twice of forging and casting measured values. The axial loading high cycle fatigue performance of EBRM TC4 titanium alloy piece is better than that of beta heat treatment forging piece, the axial loading low cycle strain fatigue properties of EBRM TC4 titanium alloy piece is the same as forging piece, which is better than that of TC4 titanium alloy casting.

关 键 词：TC4钛合金 电子束熔丝成形 力学性能 各向异性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]