摘要
Hardox400耐磨板是集高强度、韧性,良好的可加工性以及高耐磨性于一身的国外优质进口钢板。从耐磨板的堆焊修复着手,通过对3个不同合金体系的4组药芯焊丝进行堆焊试验,对比观察各组堆焊焊缝成形效果和微观金相组织,并对堆焊层进行宏观洛氏硬度测试,最后优选出了一组最适合于Hardox400耐磨板修复用FeB-C-Nb-Ni系堆焊药芯焊丝,并对其进行磨粒磨损试验考察其耐磨性能。结果表明:该堆焊层硬度值为HRC60.1,堆焊焊缝成形美观、饱满,焊缝中形成的低碳马氏体为耐磨骨架,细小NbC,Fe●B硬质相弥散分布的组织能够与基体组织很好的熔合。堆焊层合金相对耐磨性为基体材料的5.2倍,具有比Hardox400耐磨板优异的耐磨性能。
Hardox400 wear- resistant steel plate is the high- quality imported steel with high strength,toughness,good machinability and high wear resistance.In order to repair the damaged wear- resistant steel plate,flux- cored wire of Fe- B- C- Nb- Ni alloy was developed for hardfacing.Hardfacing experiment were carried out by using 4 groups of flux- cored wire for 3 alloy system.The weld appearances and microstructures with each group flux-cored wire were analyzed and compared,and the Rockwell hardness of the deposited layer was tested.Finally,the most suitable hardfacing flux cored wire of Fe- B- C- Nb- Ni alloy for Hardox400 steel repairing was obtained,and the abrasion performance of the deposited metal was studied.The results showed that:the hardness can reach 60.1 HRC,and hardfacing weld appearance is beautiful.The carbon martensite was formed as wear skeleton in the deposited metal,and the finer NbC and Fe_2B microstructure are well integrated with the substrate microstructure.The relative abrasion performance of the deposited metal is 5.2 times of that of the substrate material and it has more excellent abrasion performance than the Hardox400 steel.
出处
《焊接》
北大核心
2013年第9期42-45,71,共4页
Welding & Joining
关键词
堆焊
药芯焊丝
显微组织
耐磨性
hardfacing
flux cored wire
microstructure
abrasion performance
