激光熔化沉积TiAl合金微观组织和磨损性能研究  

Study on microstructure and wear properties of TiAl alloy deposited by laser melting

作　　者：王海江 刘占起 梁健慧 尹桂丽[1] 朱晓欧 Wang Haijiang;Liu Zhanqi;Liang Jianhui;Yin Guili;Zhu Xiaoou(School of Materials Science and Engineering,Liaoning University of Technology,Jinzhou 121001,Liaoning,China)

机构地区：[1]辽宁工业大学材料科学与工程学院,辽宁锦州121001

出　　处：《钢铁钒钛》2024年第3期86-91,共6页Iron Steel Vanadium Titanium

基　　金：辽宁省博士科研启动项目(编号:2023-BS-195);辽宁省教育厅基本科研项目(编号:LJKMZ20220960)。

摘　　要：采用激光同轴送粉沉积制造工艺在TC4基板上分别制备了一层、三层和五层的Ti-48Al-2Cr-2Nb合金样品。利用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)分析了沉积层的显微组织、裂纹形貌、磨损面形貌、相组成。试验结果表明,沉积一层的样品表面裂纹数量较少,沉积三层和五层的样品表面裂纹较多且裂纹数量相差不大。随着沉积层数的增加,沉积层中的显微组织结构由网篮组织向片层组织过渡,组织中相的变化是由单相α2→α2+γ双相转变。随着α2相含量的降低,耐磨性能随之降低,平均摩擦系数由0.34增加到0.55。One-layer,three-layer and five-layer Ti-48Al-2Cr-2Nb alloy samples were prepared on TC4 substrate by coaxial laser powder-feeding deposition manufacturing process.The microstructure,crack morphology,wear surface morphology and phase composition of the deposited layer were analyzed by optical microscope(OM),scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and X-ray diffraction(XRD).The test results show that the number of cracks on the surface of the sample deposited with one layer is less,and the samples deposited with three and five layers have more surface cracks and the number of cracks is not much different.As the number of sedimentary layers increases,the microstructure in the sedimentary layer transits from a basket structure to a lamellar structure,and the phase change in the structure is from a single phaseα2 toα2+γdual phase transition.As theα2 phase content decreases,the wear resistance decreases,and the average friction coefficient increases from 0.34 to 0.55.

关 键 词：激光沉积制造 TIAL合金 显微组织 磨损性能 

分 类 号：TF823[冶金工程—有色金属冶金]