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通过挤压铸造方法制备了ZA27合金蜗轮,并研究了固溶和时效工艺对挤压铸造ZA27合金组织和力学性能的影响。结果表明:挤压铸造工艺制备的ZA27合金蜗轮,各部位组织均匀、致密,力学性能优异。在370℃保温5 h固溶处理,合金的力学性能显著提高,抗拉强度和断后伸长率分别达到450 MPa和18.5%,分别较蜗轮本体提高14.8%和49.2%。合金在50℃和70℃时效时,硬度先升高,出现峰值后不断下降;合金在100℃和150℃时效时,硬度呈不断下降的趋势。
The ZA27 alloy worm gear was prepared by squeeze casting method and the effect of solution and aging process on the microstructure and mechanical properties of ZA27 alloy by squeeze casting was studied. The results show that the ZA27 alloy worm gear prepared by the squeeze casting process has uniform and dense structure and excellent mechanical properties. After heat treatment at 370 ℃ for 5 h, the mechanical properties of the alloy were significantly improved. The tensile strength and elongation at break reached 450 MPa and 18.5%, respectively, which were 14.8% and 49.2% higher than that of the worm wheel body respectively. When aging at 50 ℃ and 70 ℃, the hardness first increased and then decreased after the peak appeared. The hardness of the alloy tended to decrease when aged at 100 ℃ and 150 ℃.