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研究了不同熔体温度对真空差压铸造分级加压凝固A357合金的相对致密度、微观组织及力学性能的影响。结果表明,熔体温度显著影响真空差压铸造分级加压凝固A357合金的补缩效果、微观组织及力学性能。在熔体温度为590℃时进行分级加压凝固A357合金可以获得高的相对致密度,此时有利于形成较强的补缩流碎断初生相使补缩通道畅通,提高致密度,碎断的初生树枝晶将作为新晶核,形成等轴晶,细化了组织,且获得了最佳的综合力学性能。
The effects of different melt temperatures on relative density, microstructure and mechanical properties of A357 alloy by vacuum differential pressure casting were investigated. The results show that the melt temperature significantly affects the shrinkage effect, microstructure and mechanical properties of A357 alloy under vacuum differential pressure casting. When the melt temperature is 590 ℃, the A357 alloy is graded and solidified to obtain a high relative density, which is beneficial to form a strong feed stream to break the nascent phase so as to make the supplement passage clear and improve the densification and fragmentation Of the nascent dendrites will act as new nuclei, forming equiaxed grains, refining the structure, and obtaining the best overall mechanical properties.