激光快速成型TC4合金显微组织及力学性能  

Microstructures and Mechanical Properties of Laser Rapid Prototyping Deposited TC4 Alloy

作　　者：刘静[1] 刘逸婷 LIU Jing;LIU Yi-ting(School of Sciences,Northeastern University,Shenyang 110819,China.)

机构地区：[1]东北大学理学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2018年第8期1132-1136,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51690161)

摘　　要：采用金相显微镜、扫描电镜、电子拉伸机等,研究了激光快速成型TC4合金沉积态在平行沉积方向和垂直沉积方向的组织和力学性能.结果表明:激光快速成型TC4合金沉积态宏观组织沿沉积方向生长的粗大β柱状晶呈明暗相间的条带状结构,具备典型的魏氏组织特征;垂直沉积方向的强度比平行沉积方向的强度高,但塑性低;合金断口为韧窝状断口,垂直沉积方向的断口韧窝尺寸比平行沉积方向的小.Microstructures and mechanical properties of laser rapid prototyping deposited TC4 alloy in the parallel and vertical directions were studied by metallographic microscope,scanning electron microscopy and electronic tensile testing machine. The results showed that the β grains growing in the deposited direction are coarse and columnar,which shows a bright and dark strip structure and is typical Widmanstatten structure. The strength vertical to deposition direction is higher than that parallel with deposition direction,but the plasticity is low. The fracture of the alloy is dimple fracture,and the size of the dimples on the fracture vertical to deposition direction is smaller than that parallel with deposition direction.

关 键 词：激光快速成型 TC4合金 显微组织 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]