铌钨钼合金中的碳化物

随着航空航天技术的发展,要求各种高温部件的使用温度、强度、使用寿命等不断提高。中、高强铌合金具有密度小、强度高、可焊性和冷塑性好等优点,适于用作航空航天结构件。中、高强度铌合金主要通过添加一定质量分数的W、Mo、Ta、Ti、Zr、Hf等金属元素固溶强化,同时添加C元素形成碳化物进行第二相强化,产生固溶强化+弥散强化的复合强化效果。通过调整各组分元素的添加量、碳化物的结构和颗粒尺寸,来实现合金强度与塑性的合理匹配。随着合金元素添加种类、数量的增加,合金强度提高,使用温度也相应提高。本文探索了碳化物的新分析方法——电解法,将铌合金中的碳化物以电解阳极泥的形式全部分离出来,以获得合金中C的准确含量,这将有利于对中、高强度铌钨钼合金的合金化学成分和力学性能的精确调控。

THE METAL CARBIDES IN Nb-W-Mo ALLOYS

With the development of aerospace technology,the performance including service temperature,strenghth and life of components used as high temperature strucrure were required to improve increasingly.Medium-strength、high-strenghth niobium alloys having virtues such as lower density,higher high temperature strength,good solderbility and cold plasticity etc,are suitable to be used as aerospace structure components.Nb alloys providing high strength via solid solution strengthening by adding W、Mo、Ta、Ti、Zr、Hf etc,and strengthening by carbides have been considered.By adjusting element,amount,constructure and particle size of carbides,the strength and plasticity of Nb alloys would be realized well.With increasing alloy element and amount,the strength and service temperature will be improved.In the research,a new analysis method—electrolysis of carbides was studied.By electrolysis method,the carbides of Nb alloys were separated all in the anode mud,the C content of Nb-W-Mo alloys was determined.Thus,it is in favor of exactly adjusting chemical amount and mechanical property of Nb-W-Mo alloys.