变形温度对反挤压耐磨锡青铜合金组织性能的影响

针对锡含量9%~11%的耐磨Cu-Sn-Pb-Ni锡青铜合金,进行了800~950℃、不同工艺条件下的反挤压成形工艺试验,测试了经塑性变形后合金的密度、硬度和强度等性能,分析了不同工艺条件下合金的微观组织,并与传统熔铸法制备的合金性能及微观组织进行了对比。结果表明:传统熔铸法制备的合金密度和硬度分别为8.8893 g·cm~(-3)和116 HB,经不同温度反挤压塑性变形后,密度和硬度均有所提高;经900℃挤压后,密度和硬度分别达9.0409 g·cm~(-3)和139 HB;较之铸态下树枝晶明显,微观组织为α固溶体+(α+δ)共析体,挤压后合金组织晶粒明显细小和致密;在试验范围内,该合金的最佳反挤压塑性成形温度为900℃。

Influence of deformation temperature on microstructure and property of wear-resisting tin bronze alloy prepared by inverse extrusion process

For the high-tin wear-resisting Cu-Sn-Pb-Ni alloy with the tin content 9%-11%, the inverse extrusion experiments were conducted under different technological conditions within 800-950 ℃, and the density, hardness and strength of alloy were tested.Then, the alloy microstructure was analyzed under different technological conditions, and the properties and microstructure of alloy prepared by traditional melt casting method were compared.The results show that the density and hardness of Cu-Sn-Pb-Ni alloy prepared by traditional melt casting method are 8.8893 g?cm-3 and 116 HB separately, and the density and hardness are increased after inverse extrusion at different temperatures.Especially after inverse extrusion at 900 ℃, the density and hardness reach the maximum values 9.0409 g?cm-3 and 139 HB respectively.Compared with the as-cast, microstructure is mainly obvious dendrite structure which is α solid solution and eutectoid(α+δ), and microstructure of alloy grain is obviously refined and densed after extrusion.Within the range of experiments, the best inverse extrusion temperature of alloy is 900 ℃.