碳化钨铁基自熔合金堆焊层的组织及性能

Microstructure and Performance of Fe-Based Self-Fluxing Alloy WC Hardfacing Layer

二氧化碳气体保护堆焊具有诸多优点,但目前少有其堆焊铁基自熔粉末的报道。利用二氧化碳气体作为热源,在Q235钢表面堆焊Fe_314自熔合金和Fe_314与WC的混合粉末。通过金相观察、硬度测试及磨粒磨损试验,分别研究了涂层厚度及WC含量对堆焊层组织及性能的影响。结果表明:当涂层厚度为3 mm,WC含量为30%时,堆焊层显微组织由多角形碳化物(碳化钨)和少量共晶组成,硬度值达到最高,为65.7 HRC,磨损量最低,为16 mg。

Using carbon dioxide gas shielded welding as a heat source, Fe314 self-fluxing alloy powder and the mixture Fe314 self-fluxing alloy and WC were surfaced on Q235 steel. The effect of thickness and WC content of the coating on the microstructure and mechanical properties of hardtacing layer was studied by metallurgical microscope, hardness test and wear- resistance test. Resuhs showed that when the thickness of coating was 3 mm and WC content was 30%, the microstructure of the hardfaeing layer was composed of WC hard phase and liltle eutectic, in the meantime the liardness of coating reaehed the maximum （65.7 HRC） and the wear resistance was the minimum （ 16 mg）.