作　　者： ; ; ; ; ;

机构地区： 昆明理工大学材料科学与工程学院

出　　处： 《金属热处理》 2016年第12期52-57,共6页

摘　　要： 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。 Overlaying experiments were carried out on Q235 steel plate surfaces using high manganese steel flux-cored wire with different TiO2 content. Microstructure of the hardfaced layer were investigated by scanning electron microscopy （ SEM ） , electron microprobe analysis （EPMA） and X-ray diffractometers（XRD）, and the hardness and wear resistance properties of the hardfaced layer were also tested.. The test results show that by adding TiO2 and Al in wear-resistant overlaying welding wire, TiAl intermetallic compound is In situ formed by welding metallurgy reaction which will be able to refine grains in hardfaced layer and improve the hardness and wear resistance properties. When the TiO2 content is 0.53% , the microstructure and wear resistance of the hardfaced layer are the best. With the increase of TiO2 content, the wear mechanism of hardfacing layers transfers from serious adhesive wear to abrasive wear gradually.

关 键 词： 高锰钢 堆焊层 添加 组织 性能

领　　域： [金属学及工艺]