Fe-Cr-C系高碳耐磨堆焊合金组织及性能

Microstructures and properties of Fe-Cr-C hardfacing alloys with high carbon content

研究了Fe Cr C高碳耐磨堆焊合金的显微组织及其性能 ,对含碳量为 3 .3 4 %、4 .1 1 %、5 .1 6 %、6 .5 %的四种耐磨堆焊层微观组织及初生碳化物的形态进行了研究 ,分析了碳对微观组织和力学性能的影响。试验结果表明 ,对Fe Cr C耐磨堆焊合金 ,随含碳量的增加 ,初生碳化物数量越来越多且单个碳化物颗粒的体积也变大 ;堆焊层宏观硬度一直持续增加 ;当含碳量 <5 .1 6 %时 ,耐磨性随碳含量的增加而提高 ,但当含碳量到达一定程度时 ,耐磨性反而降低。碳对耐磨堆焊层的组织及性能起着重要作用 ;从理论上分析了湿砂磨损后耐磨面上的孔洞可能就是初生碳化物上的空洞

Microstructures and properties of high carbon Fe-Cr-C series hardfacing alloys were investigated. Morphology of primary carbide was studied with four kinds of hardfacing alloys that contain 3.34%, 4.11%, 5.16%, 6.5% carbon respectively. The effects of carbon element on microstructures and mechanical properties were analyzed. The results demonstrate that the quantities and the volume of primary carbide, and macro hardness of hardfacing layer increase with increasing carbon content. The wear resistance increases with increasing carbide when carbon content is less than 5.16%, but significantly decreased when carbon content increased to some degree. Carbon content is important to microstructures and properties of hardfacing layer. The theoretical analysis suggests that the cavities appearing on the hardfacing layer abraded may be the cavities on the primary carbide where the crystal defect is.