铈含量对高速钢堆焊层组织及性能的影响

Effect of Cerium Content on Microstructure and Properties of High Speed Steel Surfacing Layer

采用钨极氩弧焊在低碳钢板上堆焊了含不同质量分数(0~0.4%)铈的高速钢堆焊层,研究了堆焊层的显微组织、物相组成、硬度和耐磨性能。结果表明:当铈质量分数在0~0.4%时,堆焊层的显微组织均由马氏体、残余奥氏体和VC、WC、Cr_(23)C_6等碳化物组成;随着铈含量的增加,堆焊层的表面硬度和耐磨性能均先增后降;当铈质量分数为0.1%时,堆焊层的表面硬度最高,为61.6HRC,磨损量最小,为87.75×10~2 g·m^(-2),磨损形成的沟槽最浅,耐磨性能最好。

High speed steel surfacing layers containing different mass fractions（0-0.4%）of cerium were deposited by tungsten inert gas arc welding on the low carbon steel plate,and then the microstructure,phase composition,hardness and wear resistance of surfacing layers were studied.The results show that with the cerium mass fractions of 0-0.4%,the microstructure of the surfacing layer was composed of martensite,retained austensite and carbides,such as VC,WC and Cr（23）C6.With the increase of cerium content,the surface hardness and wear resistance of the surfacing layer increased first and then decreased.When the cerium mass fraction was 0.1%,the surface hardness of the surfacing layer reached the highest value of 61.6 HRC,the wear loss had the lowest value of 87.75×10^2 g·m^-2,and the groove formed by wear was the shallowest,indicating that the wear resistance was the best.