稀土CeO_2对Ni60A激光熔覆层组织与性能的影响

Effect of CeO_2 on microstructures and properties of Ni60A laser cladding layer

利用CO_2激光器在38CrMoAl钢表面熔覆含稀土CeO_2的Ni60A熔覆层,研究稀土含量对Ni60A熔覆层组织与性能的影响。结果表明:稀土CeO_2能够细化和净化Ni60A熔覆层组织,并促使短菱状碳化物M23C6(M=Fe,Ni,Cr)的生成;随着稀土CeO_2含量的增加,熔覆层的显微硬度、耐磨性能与耐蚀性能均呈先升后降的趋势;质量分数为1.0%时,显微硬度与耐磨性能达到最高值,硬度为731.87HV0.1,与未添加稀土熔覆层(557.2HV0.1)相比,提高了31.34%;磨损率为3.057×10^(-14)m^3/(N·m),是未添加稀土熔覆层磨损率(13.29×10^(-14)m^3/(N·m))的23%;质量分数为0.5%和1.0%时,具有最好的耐腐蚀性能,耐蚀性保护评级均为5。

Ni60 A cladding layer with rare earth oxide CeO2 was prepared on the surface of 38 Cr Mo Al steel by using CO2 laser machine. The effects of rare earth content on the microstructures and properties of Ni60 A cladding layer were researched. The results show that the addition of rare earth CeO2 plays a role in refining and purifying the microstructure of Ni60 A cladding layer,it also can promote the formation of short rod carbide M（23）C6（M=Fe,Ni,Cr）. With the increase of rare earth CeO2 content,the microhardness,wear resistance and corrosion resistance of the cladding layer increase first and then decrease. When the addition amount of rare earth is 1.0%,the surface hardness reaches the highest（731.87 HV0.1）,which is 31.34% higher than the cladding layer without rare earth（557.2 HV0.1）,and the wear resistance is the best and the wear rate is 3.057×10^（-14）m^3/（N·m）,which is 23% of the cladding layer without rare earth（13.29×10^（-14）m^3/（N·m））. When the addition amount of rare earth is0.5% and 1.0%,the cladding layers have the best corrosion resistance,and both corrosion protection ratings are 5.