通过OM、XRD以及TG/DTA等测试技术，系统研究了（α+β）双相、单一β相以及（β+γ）双相无铅硅黄铜的组织结构、硬度、铣削性能以及脱锌腐蚀等性能.结果表明：（α+β）硅黄铜虽然铣削力较低，但切屑形态欠佳，且平均脱层厚度大，为438.12μm；而（β+γ）相硅黄铜不仅切屑形态最差，硬度最高，达273.7 HB，因而铣削力也最大，增加刀具的磨损，降低刀具寿命；β相硅黄铜虽然铣削力稍高，但切屑形态为细小卷筒状，呈最优切屑形态，且在抗脱锌腐蚀测试中，β相硅黄铜平均脱锌层厚度最小，为262.94μm，所以β相硅黄铜综合性能最佳，（β+γ）硅黄铜不适合做切削黄铜，而（α+β）硅黄铜的切削性能和耐腐蚀性能都有待改进.%The test techniques of OM, XRD and TG/DTA are used to study the microstructure, cutting proper-ties and dezincification corrosion resistance systematically of the lead-free silicon brass with different phase composition, namely(α+ β) , β and (β+ γ). Results show the cutting force of silicon brass with the matrix of(α+β) phases is low enough, however, it's chip morphology is dissatisfactory. The average thickness of dezincifica-tion layer is 438.12μm. The silicon brass with the matrix of (β+ γ) phases has the worst chip morphology and the highest Brinell hardness, namely 273.7 HB, which means the highest cutting force, increasing tool wear and reducing the tool life. The silicon brass with just single phase β has higher cutting force, but the smaller roll chips, with the best chip morphology, meanwhile it performs the minimum average dezincification layer, specifically 262.94 μm, during the dezincification corrosion resistance test. Therefore, the silicon brass with just single phase β has the best comprehensive properties, brass with the matrix of (β+ γ) phases is not suit-able for cutting brass, while the cutting performance and corrosion resistance of the brass with (α+β) phase are yet to be improved.
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