Strengthening mechanism and forming control of linear friction welded GH4169 alloy joints  

作　　者：Yu SU Xiawei YANG Tingxi MENG Xinyuan HE Dong WU Wenya LI Shuo YIN 

机构地区：[1]State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China [2]Shaanxi Key Laboratory of Friction Welding Technologies,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China [3]Department of Mechanical,Manufacturing and Biomedical Engineering,Parsons Building,Trinity College Dublin,The University of Dublin,Dublin 2,Ireland

出　　处：《Chinese Journal of Aeronautics》2024年第4期609-626,共18页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 52305420, 52074228 and 51875470);the China Postdoctoral Science Foundation (No. 2023M742830);the Xi’an Beilin District Science and Technology Planning Project, China (No. GX2349)。

摘　　要：Numerical simulation and experimental research on Linear Friction Welding(LFW) for GH4169 superalloy were carried out. Based on the joint microstructure and mechanical properties,a suitable welding process was determined, which provided an important theoretical basis for the manufacture and repair of aeroengine components such as the superalloy blisk. The results show that the joint strain rate gradually increases with the increase of welding frequency, and the deformation resistance of the thermoplastic metal increases in the welding process, resulting in the interface thermoplastic metal not being extruded in time to form a flash, so the joint shortening amount gradually decreases. The thermoplastic metal in the center of the welding surface is kept at high welding temperature for a long time, resulting in the decrease of the joint strength. The microhardness of the joint shows a “W” distribution perpendicular to the weld, and most of the joints break in the Thermo-Mechanically Affected Zone(TMAZ) with high tensile strength and low elongation.When the welding area is increased without changing the aspect ratio of the welding surface, the interface peak temperature increases gradually, and the joint shortening amount decreases with the increase of the welding interface size.

关 键 词：Linear Friction Welding(LFW) Microstructure Mechanical properties Numerical simulation Joint shortening amount 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程]