轧制变形对93WNiCu合金微观结构和力学性能的影响

摘要

选用93WNiCu高比重合金,采用冷轧的方法对其进行轧制变形处理,变形量分别为5％、10％、15％、20％,通过对变形前后材料内部组织结构的观测,分析了材料内部轧制变形机理,并对变形前后的材料进行力学性能测试,对比分析轧制变形对93WNiCu合金性能的影响.结果表明:93WNiCu合金材料经过轧制变形后内部钨颗粒呈条带状,粘结相均匀分布在钨颗粒之间；轧制变形可有效地提高合金的抗拉强度,20％变形量的轧制变形就可使材料的室温抗拉强度由烧结态的900 MPa提高到1 270 MPa,延伸率由7.6％降低到4％；通过金相以及拉伸断口显微观测,分析了93WNiCu轧制变形强化机理.%The microstructure and the deformation strengthening mechanism of the 93WNiCu tungsten alloy by cold rolled deformation are studied by the transmission electron microscopy (SEM) analysis and the static tensile experiments. The results show that rolling deformation leads to fibrous microstructures, strength improvement and elongation reduction. The microstructure in 93WNiCu tungsten alloy of rolled deformation shows that tungsten particles turned to be fibrous and the binding phase distributed homogeneously around the tungsten particles. The tensile strength of 93WNiCu by cold rolled deformation is 1 270 Mpa and the elongation is 4 %.