论文部分内容阅读
在不同混料时间相同烧结工艺下制备了两件钨合金。采用金相显微镜、扫描电子显微镜以及能谱技术对两件钨合金的微观组织以及成分进行了表征,并对其进行了冲击性能测试。微观组织观察表明两件钨合金晶粒形貌、尺寸差别不大,钨颗粒晶粒尺寸介于10~50μm。微区成分测试表明两件样品钨颗粒微区成分基本相同,而粘结相区差别较大。混料时间较长的钨合金粘结相区W元素含量较高,Ni、Fe、Co元素含量较低;而混料时间较短的钨合金微区成分正好相反。冲击韧性测试表明混料时间较长的钨合金冲击韧性明显降低。冲击断口显示混料时间较长的钨合金粘结相区撕裂棱较短,而混料时间较短的钨合金粘结相区撕裂棱较长。
Two tungsten alloys were prepared under the same sintering process at different mixing times. The microstructure and composition of two tungsten alloys were characterized by optical microscope, scanning electron microscopy and energy dispersive spectroscopy, and their impact properties were tested. Microstructure observation shows that the grain shape and size of the two tungsten alloys are not significantly different, and the grain size of the tungsten particles is between 10 and 50 μm. The micro-zone composition test shows that the tungsten micro-zone composition of the two samples are basically the same, but the difference of the bonding phase area is larger. The W element content in the binder phase of the tungsten alloy with longer mixing time is higher, and the content of Ni, Fe and Co elements is lower. However, the composition of the tungsten alloy with the shorter mixing time is just the opposite. Impact toughness test showed that the longer the mixing time of tungsten alloy significantly reduced impact toughness. The impact fracture shows that the torn edge of the tungsten alloy bonded phase with longer mixing time is shorter and the torn edge of the tungsten alloy bonded phase with shorter mixing time is longer.