热处理对激光选区熔化AlSi10Mg合金力学性能与组织的影响

进行了激光选区熔化AlSi10Mg合金退火态显微组织观察、力学性能测试,并对AlSi10Mg合金进行不同热处理。结果表明,激光选区熔化AlSi10Mg合金的力学性能优于ZL104和LD2合金,扫描方向组织呈扫描道带状堆积结构,成形方向呈不规则的鱼鳞状结构;随着固溶温度从525℃提高到545℃,AlSi10Mg合金的抗拉强度和屈服强度均降低,伸长率和断面收缩率均有降低的趋势,显微组织过烧现象越来越严重,导致AlSi10Mg铝合金力学性能随之下降。从力学性能和金相组织综合考虑,AlSi10Mg铝合金在525℃下固溶最佳。

Effects of Heat Treatment on Microstructure and Mechanical Properties of Laser Selective Melting AlSi10Mg Alloy

The microstructure and mechanical properties of 3 D-printed AlSi10 Mg alloy in annealing state were analyzed, and AlSi10 Mg alloy was treated in different heat treatment. The results reveal that the mechanical properties of laser forming AlSi10 Mg alloy are superior to those of ZL104 and LD2 alloy, and the microstructure of scanning direction presents strip-shaped piled-up structure, while microstructure of the forming direction shows irregular fish scale structure. With the increase of solution temperature from 525 ℃ to 545 ℃, the mechanical properties of the AlSi10 Mg alloy are decreased,such as tensile strength, yield strength, elongation and fracture contraction rate as a result of the increasingly serious over-burning phenomenon of microstructure. Taking into account mechanical properties and metallographic structure, the optimized solution temperature for AlSi10 Mg alloy is 525 ℃.