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采用力学性能测试、光学显微镜、扫描电镜、X射线衍射分析、切削性能测试等技术手段,研究了热处理对易切削变形Zn-1.1Cu-0.5Bi合金组织与性能的影响。结果表明:使Zn-1.1Cu-0.5Bi合金强度、硬度提高的较佳热处理工艺为350℃,保温30 min。350℃×30 min热处理态合金组织变得更均匀,但伴随有晶粒的明显长大;热处理态合金比挤压态屈服强度稍有下降,抗拉强度提高11.7%,伸长率有所下降。Zn-1.1Cu-0.5Bi合金铸态切削性能最好,挤压态和热处理态切削性能稍有下降,热处理对合金切削性能改善不明显。
The effects of heat treatment on the microstructure and properties of Zn-1.1Cu-0.5Bi alloy with free-cutting deformation were studied by mechanical tests, optical microscopy, scanning electron microscopy, X-ray diffraction analysis and cutting performance test. The results show that the better heat treatment process for increasing the strength and hardness of Zn-1.1Cu-0.5Bi alloy is 350 ℃ and holding time is 30 min. At 350 ℃ for 30 min, the microstructures of the as-treated alloy became more uniform but with the obvious grain growth. The yield strength of the heat-treated alloy was slightly lower than that of the extruded state, the tensile strength increased by 11.7% and the elongation decreased . The cutting performance of Zn-1.1Cu-0.5Bi alloy is the best, the cutting performance of the extruded state and the heat-treated state is slightly decreased, and the improvement of the machinability of the alloy is not obvious.