中频熔敷WC、铬铁、SiC增强铁基复合层组织和耐磨性研究

IF Deposited WC,Chrome Iron,SiC Reinforced Iron Matrix Composite Layer and the Wear Resistance

为了进一步提高Fe55自熔性合金粉末熔敷层的耐磨性能,在Fe55合金粉末中添加了碳化钨、铬铁、碳化硅颗粒,利用中频感应加热在42CrMo钢表面进行熔敷。通过正交试验研究了碳化钨、铬铁、碳化硅颗粒加入量对熔敷层组织、结构、硬度及耐磨性的影响。研究表明:铬铁添加量在10%,碳化钨添加量在8%,碳化硅添加量在3%时,熔敷层组织形态为细小的树枝晶和胞状晶,组织主要为马氏体组织和残余奥氏体组织,并有Cr9.1Si0.9,W3Cr12Si5,Cr2B等硼化物和碳化物的硬质点分布,熔敷层硬度高达60HRC,耐磨性较Fe55提高1.7倍。

In order to further improve the wear resistance of the Fe55 spray melt alloy powder cladding layer, the Fe55 melt alloy powder in adding different compositions of tungsten carbide, ferrochrome, silicon carbide particles was deposited on the 42CrMo surface with medium frequency induction heating. The effect of addition of tungsten carbide, chromium iron, silicon carbide particle on the organization, structure, hardness and wear resistance of coating was stud ied by orthogonal experiment. Research shows that： when ferrochrome additives quantity in 10%, tungsten carbide in 8 %, silicon carbide in 3%, the cladding layer organization form for tiny branches crystal and cellular crystal, the organization mainly for martensite organizations and retained austenite organization, and have Cr9.1Si0.9 , W3Cr12Si5 , Cr2 B etc of carbide and carbon boron carbide distribution on cladding layer, HRC reach up to 60, wearability improving 1.7 times than Fe55.