激光熔化沉积制造γ-TiAl合金的组织与性能  

Microstructure and Properties of γ-TiAl Alloy Fabricated by Laser Melting Deposition

作　　者：刘占起 王文博[2] 马瑞鑫 徐国建[2] 郑文涛[2] Liu Zhanqi;Wang Wenbo;Ma Ruixin;Xu Guojian;Zheng Wentao(Shenyang University of Technology,Shenyang 110870,China;School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]沈阳工业大学,辽宁沈阳110870

出　　处：《稀有金属材料与工程》2020年第6期1925-1930,共6页Rare Metal Materials and Engineering

基　　金：Intelligent Additive Manufacturing System Platform(2017YFB1103000)。

摘　　要：通过激光熔化沉积制造技术制备了X×Y×Z(40 mm×5 mm×60 mm)的Ti-48Al-2Cr-2Nb合金沉积样品。利用光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射(XRD)、透射电子显微镜(TEM)和电子背散射衍射(EBSD)分析了沉积样品的显微组织、相组成、晶粒取向及断口形貌;利用维氏硬度计测量了沉积样品不同位置的硬度分布;利用拉伸机测量了沉积样品在Z向的拉伸性能。结果表明,在最佳工艺参数条件下获得了成形良好的沉积样品,经过渗透检测后发现表面无裂纹。沉积样品的显微组织由α2+γ层片状晶团及少量块状γ-Ti Al相组成。在沉积状态下,沿试样Z方向的室温抗拉强度为425MPa,延伸率为3.3%。拉伸试样的断口形貌为准解理断口。The deposited sample of X×Y×Z(40 mm×5 mm×60 mm)Ti-48Al-2Cr-2Nb alloy was fabricated by laser melting deposition.The microstructure,phase composition,grain orientation and fracture morphology of the deposited sample were analyzed by optical microscope(OM),scanning electron microscope(SEM),X-ray diffraction(XRD),transmission electron microscope(TEM)and electron backscattering diffraction(EBSD).The hardness distribution at different positions of the deposited sample was measured by Vickers hardness tester.The tensile properties of the deposited sample in Z direction were measured by tensile machine.The results show that the well-formed deposited sample is obtained under the optimum process parameters,and no surface cracks are found after penetration detection.The microstructure of the deposited sample is composed ofα2+γlamellar colony and a small amount of bulkγphase.For as-depositedγ-Ti Al alloy,the room-temperature tensile strength along the Z direction is 425 MPa and the elongation is 3.3%.The fracture morphology of tensile specimen is quasi-cleavage fracture.

关 键 词：激光熔化沉积 Γ-TIAL合金 显微组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG665[金属学及工艺—金属材料]