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采用等离子熔覆技术制备硼化物强化铁基堆焊合金,借助OM、SEM和XRD等方法对合金组织和硼化物相形貌进行了分析,并与未加入硼的Fe-Cr-C堆焊合金进行对比。结果表明:向堆焊合金中加入2.5%硼,能诱发基体的马氏体转变,使堆焊层形成大量硼化物,从而改善耐磨性;硼化物由大量层片状M23(C,B)6和少量蜂窝状M7(C,B)3相组成,BC4与Cr2B的数量较少;加入2.5%硼的堆焊层中形成的大量高硬度硼化物分布在具有较高强韧性的马氏体和奥氏体上,使其具有最佳的耐磨性。
The plasma enhanced welding process was used to prepare the boride reinforced iron based surfacing alloy. The morphology of the alloy and the boride phases were analyzed by OM, SEM and XRD. The results showed that the addition of boron to the Fe-Cr-C surfacing alloy comparing. The results show that adding 2.5% boron to the surfacing alloy can induce the martensite transformation of the matrix and form a large amount of borides in the surfacing layer to improve the wear resistance. Boride is composed of a large number of lamellar M23 (C, B) 6 and a small amount of cellular M7 (C, B) 3 phase, the amount of BC4 and Cr2B is less; a large amount of high hardness boride formed in the surfacing layer with 2.5% boron is distributed in the martensite with higher toughness and Austenitic, so that it has the best wear resistance.