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为了改善金属拉拔卷筒的耐磨性能,采用CO2激光对40Cr钢拉拔卷筒表面进行激光合金化处理,利用OM、XRD、显微硬度计、SEM、磨损试验机研究了Y2O3对合金化层的组织性能的影响。结果表明:Y2O3添加量在0～2.5%变化时,随着Y2O3含量的增加,合金化层组织逐渐变细,Y2O3含量在1.0%时,合金化层组织最细,Y2O3的含量大于1.0%时,合金化层的组织反而变的粗大。未添加Y2O3时,合金化层除了基体相α-Fe外,同时还包括MoC、Cr3Mo、Cr7C3和Fe2MoC等相。添加Y2O3后,还生成了少量的FeCrMo相。Y2O3还可以抑制Mo、Cr等原子由晶内向晶界扩散。Y2O3添加量为1.0%时,合金化层具有最高的硬度和耐磨性,当Y2O3含量大于1.0%时,合金化层的硬度和耐磨性随着Y2O3含量的增加反而降低。
In order to improve the wear resistance of the metal pull-out drum, CO2 laser was used to laser alloyed the surface of the 40Cr steel pull-out drum. The effect of Y2O3 on the alloying was studied by using OM, XRD, microhardness tester, SEM and wear tester. The impact of the layer’s organizational performance. The results show that the microstructure of the alloying layer decreases with the increase of Y2O3 content when Y2O3 content is 0-2.5%. When the Y2O3 content is 1.0%, the microstructure of the alloy layer is the thinnest and the Y2O3 content is more than 1.0% , The alloying layer of the organization becomes coarse instead. In the absence of Y2O3, the alloying layer includes, in addition to the matrix phase α-Fe, MoC, Cr3Mo, Cr7C3 and Fe2MoC phases. After adding Y2O3, a small amount of FeCrMo phase was also formed. Y2O3 can also inhibit Mo, Cr and other atoms from the grain to the grain boundary diffusion. Y2O3 dosage of 1.0%, the alloying layer has the highest hardness and wear resistance, when the Y2O3 content is greater than 1.0%, the alloying layer hardness and wear resistance with Y2O3 content increases but decreases.