W-Ni-Fe高比重合金板材冷轧变形行为及其显微组织特征研究

采用冷轧变形工艺制备了93W-4.9Ni-2.1Fe高比重合金板材试样,并用数码金相显微镜和扫描电镜观察和分析了冷轧前后显微组织的演变。研究结果表明,在轧制过程中,随着变形量的增大,试样在宏观上表现为纵向延伸与横向宽展,微观上近球形的钨颗粒首先椭球化,最终变成纤维状。钨颗粒长短轴比随轧制变形量的增大而增大,出现各向异性特征。当试样压延变形量〈10%时,Ni-Fe粘结相的变形对宏观变形起主导作用;当10%〈变形量〈60%时,钨颗粒和Ni-Fe粘结相的变形对宏观变形共同作用;而变形量〉60%时,钨颗粒变形成为宏观变形的主要因素。

Deformation Behavior and Microstructure Characteristics of Cold Rolled W-Ni-Fe Heavy Alloys Sheet

Microstructures development,hardness and mechanical properties of cold rolled 93W-4.9Ni-2.1Fe alloy sheets were investigated.Microstructure morphology and grain size were analyzed with digital microscope and SEM.The experimental results showed that the ratio of the long-short axis of tungsten particles and the hardness of sheets increased with the increasing of the cold deformation in thickness of 93W-4.9Ni-2.1Fe samples.If the reduction was less than 10%,microdeformation of the samples was mainly dependent on the deformation amount of Ni-Fe binder phase.Otherwise,the deformation of both tungsten and Ni-Fe binder phases contributed to the sample deformation if the deformation in thickness was between 10% and 60%.Deformation of tungsten grains played a crucial role when the reduction in thickness was more than 60%.