基于TiC-VC耐磨堆焊的硬度与合金过渡的试验研究

Research on the Hardness and Alloy Element Transition of Hardfacing Welding Based on TiC-VC

基于TiC、VC的高显微硬度 ,利用药皮中钛铁、钒铁、石墨等组分的高温电弧冶金反应在堆焊层中生成碳化物硬质相。系统研究了药皮组分对堆焊层硬度和合金元素过渡系数的影响 ,利用扫描电镜 (SEM )、电子探针(EMPA)观察和分析了堆焊层中碳化物的分布、形貌和成分。结果表明 :随着药皮中钛铁、钒铁、石墨组分的增加 ,堆焊层硬度提高 ,但当石墨组分超过1 2 %时 ,堆焊层硬度下降。随着药皮中钛铁、钒铁、石墨组分增加 ,熔敷金属中Ti、V、C元素含量不断提高 ,Ti、V、C元素过渡系数提高 ,但V、C元素过渡系数分别在钒铁 1 2 %、石墨 1 4%时达到最大。

Based on high micro-hardness of TiC and VC, the hardness phases of carbides in welding metal were formed by using arc high temperature metallurgic reaction of Fe-Ti, Fe-V and graphite in the coat. The surfacing metal hardness and alloy element transition coefficients were systematically investigated. By means of SEM and EMPA, the distribution, appearance and ingredient of carbides were observed and analyzed. The results show that hardness of surfacing welding increases with increasing of Fe-Ti, Fe-V and graphite in the coat, however, the hardness decreases when graphite is beyond 12%.Elements Ti, V and C in the deposited metal increase Transition coefficients of Ti, V, C increase with the increasing of Fe-Ti, Fe-V and graphite in the coat, however, the transition coefficients of V and C decrease when the Fe-V is beyond 12% and graphite is beyond 14%.