Fe-xC-1.5B合金的微观组织及耐磨性

Microstructure and wear resistance of Fe-xC-1.5B alloy

利用OM、XRD、SEM、宏观硬度测试与冲击磨料磨损试验,研究Fe-xC-1.5B合金（x=0.6mass%1.5mass%）的微观组织演变以及硬度与耐磨性的变化规律。结果表明：Fe-xC-1.5B合金的凝固组织主要由α-Fe、Fe3C和共晶硼化物或者硼碳化物（Fe2B、Fe3（C,B）和Fe23（C,B）6）组成,共晶硼化物和硼碳化物分别呈鱼骨状和菊花状分布;随着碳含量的增加,共晶硼化物或者硼碳化物明显增多,合金的硬度为4047HRC、相对耐磨性是亚共晶高铬铸铁的0.91.3倍,表现出优异的耐磨性。

Microstructure evolution,hardness and wear resistance of Fe-xC-1.5B alloy（x = 0.6 mass%-1.5 mass%） were studied by means of optical microscope（OM）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,macrohardness test and impact abrasive wear test.The results show that the solidification microstructure of the Fe-xC-1.5B alloy is mainly composed of α-Fe,Fe3C and eutectic boride or boron carbide（Fe2B,Fe3（C,B）,Fe23（C,B）6）,and the eutectic boride and boron carbide exhibit fishbone shape and chrysanthemum-like distribution,respectively.With the increasing of carbon content,the amount of the eutectic boride or boron carbide increases significantly.The hardness of the alloy is 40-47HRC,and the relative wear resistance is about 0.9-1.3 times of hypoeutectic high chromium cast iron,showing excellent wear resistance.