基于振动条件下高铬铸铁组织和性能的变化

Microstructure and Properties of High Chromium Cast Iron Under Vibration Condition

高铬铸铁在凝固过程中,易形成粗大的初生碳化物,降低了材料的冲击韧性。通过在高铬铸铁凝固过程中外加机械振动处理,探究了振动工艺参数对碳化物形态、冲击韧性及耐磨性能的影响。采用光学显微镜和扫描电镜观察高铬铸铁显微组织的变化;利用X射线衍射和电子探针分析了物相组成。结果表明:与未经过振动处理的高铬铸铁相比,振动处理的高铬铸铁中M_(7)C_(3)型碳化物得到了细化,其冲击韧性较未处理高铬铸铁提高了16.36%;耐磨性提高了2.9倍。

In the solidification process of high chromium cast iron,coarse primary carbides are easily formed,which reduces the impact toughness of the material.The effect of vibration process parameters on carbide morphology,impact toughness and wear resistance of the high chromium cast iron was investigated by mechanical vibration treatment during solidification.The microstructure of the high chromium cast iron was observed by optical microscope and scanning electron microscope(SEM).The phase composition was analyzed by X-ray diffraction and electron probe.The results showed that compared with the high chromium cast iron without vibration treatment,the M_(7)C_(3) carbides in the high chromium cast iron with vibration treatment were refined,and the impact toughness-increased by 16.36%.The wear resistance increased by 2.9 times.