固溶处理对高真空压铸AlSi10MnMg铝合金组织及力学性能的影响

Effects of Solution Treatment on Microstructure and Mechanical Properties of High Vacuum Die-casting Automobile Shock Absorption Tower

为优化高真空压铸汽车减震塔的力学性能,采用硬度测试、拉伸测试及扫描电镜等手段研究了固溶时间、温度对Al Si10MnMg合金减震塔显微组织及力学性能的影响。结果表明:减震塔压铸态组织细小,其中,硅相的平均直径只有0.37μm,经460℃固溶0.5 h后即能使硅相溶断并球化。铸件T6处理后的强度随固溶温度的上升而不断提高,经T6(530℃×0.5 h+180℃×2 h)热处理后,减震塔获得的强度最高,其材料的屈服强度为263.24 MPa,抗拉强度为344.53 MPa,伸长率为15.83%。

In order to optimize the mechanical properties of high vacuum die-casting automobile shock absorber tower,the effects of solid solution time and temperature on the microstructure and mechanical properties of Al Si10 MnMg alloy shock absorbing tower were studied by means of hardness test, tensile test and scanning electron microscope. The results show that the die-casting microstructure of the damping tower is fine. The average diameter of silicon phase is only 0.37 μm. After solid solution at 460 ℃ for 0.5 h, silicon phase can be dissolved and globalized. The strength after the T6 treatment of the casting is continuously increased with the rise of the solid-dissolving temperature. After T6 heat treatment of 530 ℃ for 0.5 h+180 ℃ for 2 h, the strength of the shock-absorbing tower is the highest, and the yield strength, tensile strength and elongation of the material are 263.24 MPa, 344.53 MPa and 15.83%, respectively.