Microstructure Evolution and Its Effect on Mechanical Properties in an Electron Beam Weldedβ-Solidified TiAl Alloy
作者机构：State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an710072China Chongqing Innovation CenterNorthwestern Polytechnical UniversityChongqing401135China AVIC Manufacturing Technology InstituteBeijing100024China Shaanxi Key Laboratory of Electrical Materials and Infiltration TechnologySchool of Materials Science and EngineeringXi’an University of TechnologyXi’an710048China
出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)
年 卷 期：2023年第36卷第10期
页 面：1619-1629页
核心收录：
学科分类：0806[工学-冶金工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：supported by the National Key Research and Development Program of China(No.2021YFB3702603) the National Natural Science Foundation of China(No.52174377) the Research Fund of the State Key Laboratory of Solidifcation Processing(NPU),China(Grant No.2022-TS-06)
主 题：TiAl alloys Electron beam welding Microstructure Phase transformation Mechanical properties
摘 要：TiAl alloys are susceptible to cracks during electron beam welding because their limited ductility cannot accommodate the stress generated under fast cooling *** this work,pre-heating and post-heating via defocused electron beam were used to obtain well-welded joints without *** crack sensitivity of joints was attributed to the microstructure evolution to obtain more ability of stress accommodation with the increasing heating beam current and heating ***-time pre-heating of 5 min and post-heating of 12 min led to reduced volume fraction of residualβ0 phase with the growth ofα2/γlamellar colonies in the fusion zone(FZ).The refined microstructure of FZ contributed to the highest hardness of the FZ,and the fracture happened at the base material(BM)in tensile tests,indicating that the tensile properties of the welding seam surpassed that of the *** work provides an effective way to obtain TiAl joints with better mechanical properties of the welding seam than that of the BM,which is a breakthrough in the welding of TiAl alloys.
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