W-Ni-Fe高比重合金断口形貌研究

Research on Fracture Surface of W-Ni-Fe Tungsten Heavy Alloy

通过对W-Ni-Fe高比重合金力学性能差别很大的两组断口形貌进行分析,在一些高比重合金钨颗粒内发现有W-Ni-Fe的沉淀相,该沉淀相对合金力学性能的提高有益。沉淀相形成主要与成分配比以及烧结后期的真空处理有关。断口形貌可以反应高比重钨合金的烧结状况,而材料的力学性能与合金断口形貌又有很明显的对应关系,因此,要获得很高的力学性能,烧结及热处理工艺是十分重要的工序。

Tow fracture surfaces of W-Ni-Fe tungsten heavy alloy which have a world of difference in mechanical property are analysed. It is observed that there is precipitated phase containing iron, nickel and tungsten in tungsten grain of tungsten heavy alloy, and the precipitated phase is favourable to enhancing mechanical property of the alloy. The formation of the precipitated phase appeared to be associated with post-sintering vacuum treatment. The sintering state of tungsten heavy alloy can be showed on fracture surface, and the mechanical property of materials corresponds to the fracture surface obviously. Sintering process and heat treatment are the most important to mechanical property of tungsten heavy alloy.