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在Q235钢板上,用不同TiO_2含量的高锰钢堆焊药芯焊丝进行堆焊试验。采用扫描电镜、电子探针和X射线衍射仪等对堆焊层的显微组织进行分析,测试熔敷金属的硬度及耐磨性。结果表明:在耐磨堆焊焊丝中添加TiO_2和Al,通过焊接冶金反应原位生成TiAl金属间化合物颗粒,能对堆焊层组织产生细化作用,并能提高堆焊层的硬度和耐磨性。添加0.53%的TiO_2堆焊层熔敷金属具有最优的微观组织及耐磨性能;随着TiO_2的添加,熔敷金属磨损机制由黏着磨损逐渐转变为磨料磨损。
In the Q235 steel, with different content of TiO_2 high manganese steel surfacing flux cored welding surfacing test. The microstructure of surfacing layer was analyzed by scanning electron microscopy, electron probe and X-ray diffractometer to test the hardness and wear resistance of deposited metal. The results show that the addition of TiO_2 and Al to the hardfacing welding wire can generate TiAl intermetallic particles in situ through the welding metallurgy reaction, which can refine the surfacing layer and improve the hardness and wear resistance of the surfacing layer Sex. Adding 0.53% of the deposited layer of TiO_2 has the best microstructure and wear resistance. With the addition of TiO_2, the wear mechanism of the deposited metal gradually changes from adhesive wear to abrasive wear.