高铝钛镍基高温合金激光增材制造裂纹抑制研究OA

High alumina titanium nickel based high-temperature alloys are widely used in aerospace and other fields due to their excellent high-temperature performance.However,cracks are prone to occur during laser additive manufacturing,which seriously hinders their engineering applications.This article comprehensively explores the mechanism of crack formation in laser additive manufacturing of high alumina titanium nickel based high-temperature alloys,and suppresses crack formation by adjusting process parameters,improving material composition,and enhancing post-treatment processes.According to the theory of thermal stress and the principle of solidification and crystallization,combined with a large amount of experimental data and analysis,we have clarified how parameters such as laser power,scanning speed,and powder feeding rate affect the formation of cracks.Experiments have shown that with improved process parameters and treatment methods,the crack rate can be reduced to below 5%,providing theoretical basis and technical support for the engineering application of laser additive manufacturing of high alumina titanium nickel based high-temperature alloys.