电磁耦合处理对7050铝合金承力框铸件初始残余应力调控研究

Control of Initial Residual Stress of 7050 Aluminum Alloy Load-bearing Frame Casting by Electromagnetic Coupling Treatment

摘要: 通过电磁耦合处理工艺参数的变化研究了7050铝合金承力框铸件的力学性能及初始残余应力。结果表明，在磁场强度为1.5 T，电流强度为25 A/mm²时，7050铝合金的抗拉强度可提升10 MPa，伸长率提高16.73%，电阻率提升3.24%，塑性增强。7050铝合金承力框铸件初始残余应力小且分布均匀。采用磁场强度为1.5 T、电流强度为25 A/mm²的工艺参数，可使初始残余应力降低约10%。

Abstract: The mechanical properties and initial residual stress of 7050 aluminum alloy load-bearing frame casting were studied by changing the process parameters of the electromagnetic coupling treatment.The results show that the tensile strength of 7050 aluminum alloy can be increased by 10 MPa, elongation increased by 16.73%, the resistivity increased by 3.24% and plasticity enhanced when the magnetic field intensity is 1.5 T and the current intensity is 25 A/mm².Through the blind hole method and ultrasonic method, the initial residual stress of 7050 aluminum alloy load-bearing frame casting is small and evenly distributed.The initial residual stress can be reduced by about 10% with the magnetic field intensity of 1.5 T and current intensity of 20 A/mm².