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采用真空自耗熔炼工艺对粉末冶金态钨锆合金进行熔炼,得到高密度、高强韧的熔炼态钨锆合金。通过金相显微镜、SEM、EDS等对粉末冶金态和熔炼态钨锆合金的显微组织、力学性能和断口形貌进行分析与表征。结果表明:自耗熔炼可以消除烧结态存在的气孔,得到组织均匀的熔炼态钨锆合金;熔炼态合金显微组织主要由Zr-Ti相和W-Ti相组成,其中钨组元在熔炼中没有熔化,主要发生随机团聚现象;熔炼态钨锆合金断口形貌表现出韧性和脆性两种断裂方式共存特征,且密度与强度较粉末冶金态有明显提高。
Using vacuum consumable smelting process of tungsten powder metallurgy tungsten alloy smelting, high density, high toughness of tungsten-zirconium alloy melting. The microstructure, mechanical properties and fracture morphology of powder metallurgy and smelting tungsten-zirconium alloy were analyzed by metallographic microscope, SEM and EDS. The results show that the consumable smelting can eliminate the pores in the sintered state and obtain the homogeneous tungsten-zirconium alloy. The microstructure of the alloy is composed of Zr-Ti phase and W-Ti phase. Without melting, random reunion mainly occurred. The fracture morphology of the melt tungsten-zirconium alloy showed the coexistence characteristics of ductile and brittle fracture, and the density and strength of the alloy were obviously higher than that of powder metallurgy.