不同处理工艺对高合金堆焊合金层组织及耐磨性影响

Effect of Different Treatment Processes on Microstructure and Wear Resistance of High Alloy Hardfacing Layer

采用高合金堆焊药芯焊丝对9CrMoV轧辊钢基体表层进行堆焊修复,焊后分别对堆焊试样进行空冷、砂冷及淬火回火处理。采用金相显微镜观察以及磨损试验对焊后不同处理条件下的熔覆层组织及耐磨性进行对比分析。结果表明:焊后不同处理条件熔覆层组织以及耐磨性具有较大的差异,焊后空冷条件下熔覆层主要为粗大的片状马氏体,耐磨性较差;焊后砂冷条件下,粗大的片状马氏体减少,出现部分细小的板条马氏体,同时耐磨性提高;当焊后处理条件为调质时,熔覆层几乎全部为细小的板条回火马氏体,并出现部分贝氏体,耐磨性较高。

Taking high alloy flux-cored welding wire on 9CrMoV roll steel for surfacing welding restoration, air-cooled,sand colded, quenched and tempered treatment were carried out after welding, respectively. The microstructure and wear resistance of the samples were analyzed under different different treatment conditions by microscope. The results show that the microstructure and wear resistance of high alloy hardfacing layer appear obvious differences under the different postweld treatment conditions. When taking air-cooled, there are mainly coarse plate martensite in cladding layer, at the same time, the wear resistance is poor. Under the sand cooling condition after welding, the thick plate martensite decreases,and generates small part of lath martensite, while the wear resistance increases. When taking as quenched and tempered treatment after welding, the cladding layer of high alloy hardfacing layeral generates most all small tempered lath martensite and a part of bainite, and the wear resistance is highest.