真空自耗熔炼对钨锆合金显微组织与力学性能的影响  

Microstructure and mechanical properties of W-Zr alloy prepared by vacuum consumable arc-melting

作　　者：刘凯[1] 梁栋[1] 朱曦光[2] 刘桂涛[1] 陈敏[1] 王志威[1] 葛文艳[1] 李德林[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103 [2]北京航天长征飞行器研究所,北京100076

出　　处：《兵器材料科学与工程》2016年第1期79-84,共6页Ordnance Material Science and Engineering

基　　金：总装备部预先研究项目(51312030805)

摘　　要：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。W- Zr alloy was melted by vacuum consumable arc- melting to improve the density,strength and toughness. The microstructure,mechanical property and fracture morphology of W- Zr alloy before and after melting were investigated and characterized by means of metallographic microscope,SEM and EDS. The results show that vacuum arc-melting process can eliminate the porosity of alloy,and prepare W-Zr alloy with uniform microstructure;the microstructure of melted alloy is mainly composed of Zr-Ti and W-Ti phases,in which tungsten does not melt in the melting and randomly agglomerates;Fracture morphologies of melted alloy show the ductile and brittle fracture mode,and the density and strength are significantly improved compared with those prepared by powder metallurgy.

关 键 词：钨锆合金 真空自耗熔炼 显微组织 力学性能 断口形貌 

分 类 号：TJ7[兵器科学与技术—武器系统与运用工程]