铸造工艺对ADC-12再生铝合金显微组织和力学性能的影响

Effect of Casting Process on Microstructure and Mechanical Properties of ADC-12 Recycled Aluminum Alloy

本文采用钢模浇铸和离心浇铸真空熔炼商用ADC-12再生铝合金,研究铸造工艺对ADC-12再生铝合金的显微组织和力学性能的影响。结果表明:离心浇铸对ADC-12再生铝合金显微组织和力学性能有良好促进作用,共晶Si相由片状或血小板状转变为网状或点状,α-Al相逐渐变得圆整、轮廓清晰且分布均匀,β-Fe相由粗大长针状转变为聚集的圆球状;相比钢模浇铸样品,离心铸造后凝固组织结构的细化,使得机械性能进一步提高,具体表现在抗拉强度相比钢模浇铸样品提升了37.6%,断面延伸率提高了97.9%;断口分析表明,离心铸造后断裂类型转变为韧脆混合断裂,材料塑韧性得到大幅度增强。实验结果表明在再生铝合金熔炼过程中,离心浇铸工艺可明显提高合金性能,有效改善产品质量。

In this paper, the influence of solidification process on the microstructure and mechanical properties of ADC-12 recycled aluminum alloy was studied by steel mold casting and centrifugal casting after vacuum melting. The results show that centrifugal casting has a good effect on the microstructure and mechanical properties of ADC-12 recycled aluminum alloy. The eutectic Si phase changes from flake or platelet-like to net-like or pointlike, α-Al phase gradually becomes round, clear with even distribution, and β-Fe phase changes from thick and long needle-like to thin clustered spherical feature. Compared with the steel mold casting sample, the refinement of microstructure after centrifugal casting improves mechanical properties, which is reflected in the tensile strength increased by 37.6%, and the section elongation increased by 97.9%. The results prove that the centrifugal casting process can significantly improve the mechanical properties and structure quality of recycled aluminum alloy.