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采用正交试验法对喷射沉积过共晶铝硅合金挤压坯的固溶+人工时效处理工艺进行优化,研究固溶和人工时效的温度及时间对挤压态合金组织结构的影响,测定不同热处理后合金的硬度和耐磨性,确定最佳的热处理工艺。结果表明,固溶温度、固溶时间、时效时间和时效温度对过共晶铝硅合金组织和性能的影响依次降低。并得出最佳的热处理工艺为520℃×3 h固溶+120℃×10 h时效,处理后合金的硬度为84.4HB,相对耐磨性为原始挤压态试样的1.22倍。
The orthogonal experiment was used to optimize the solution treatment and artificial aging treatment of spray-deposited hypereutectic Al-Si alloy extrusion billet. The effects of solution temperature, aging time and microstructure on the structure of extruded alloy were studied. After heat treatment of the alloy hardness and wear resistance, to determine the best heat treatment process. The results show that the effect of solution temperature, solution time, aging time and aging temperature on the microstructure and properties of hypereutectic Al-Si alloys decreases in turn. And the best heat treatment process is 520 ℃ × 3 h solution + 120 ℃ × 10 h aging, the hardness of the treated alloy is 84.4HB, the relative wear resistance is 1.22 times of the original extruded state sample.