摘要
研制一种Fe-B-Nb-Ni系钻杆耐磨带堆焊药芯焊丝,采用CO_2气体保护堆焊方法,制备Fe-B-Nb-Ni耐磨堆焊合金,利用OM,SEM,XRD等方法对堆焊合金的显微组织进行了观察分析,对堆焊层的硬度及耐磨性能进行了测试分析。结果表明,Fe-B-Nb-Ni堆焊合金耐磨性能比国外某进口药芯焊丝提高了约37%,其宏观硬度值达到HRC60.5～62.2。Fe-B-Nb-Ni堆焊合金的显微组织为马氏体+铁素体+少量渗碳体+颗粒状NbC+包晶Fe_3(B,C)+共晶Fe_(23)(B,C)_6、Fe_3(B,C)+少量共晶Fe_2B相,其中NbC硬质颗粒弥散的分布于基体中,基体中的马氏体组织具有优异的强度和耐磨性,起到了很好的耐磨骨架的作用。Fe-B-Nb-Ni堆焊合金的磨损机理主要是犁沟式微切削和局部的硬质相剥落。
A kind of flux cored wire was developed to deposited the wear resistant band on drill pipe.The deposited alloys of Fe-B-Nb-Ni were prepared by CO_2 gas shielded flux cored arc welding.The microstructures of the Fe-B-Nb-Ni alloys were investigated by optical microscopy, scanning electron microscopy,X-ray diffraction,etc.At the same times,its hardness and the wear resistance of the surfacing layer were tested. The results show that the Fe-B-Nb-Ni alloy exhibits excellent wear resistance which is higher 37%than the imported flux-cored wire.The hardness value of the Fe-B-Nb-Ni alloy is up to HRC60.5～62.2.The microstructure of the Fe-B-Nb-Ni alloy consists of ferrite + martensite + Fe_3C + NbC + eutectic structure Fe_3(B,C) + Fe_(23)(B,C)_6 + Fe_2B.A large number of fine niobium carbides are randomly dispersed in the microstructure of the alloys.The martensite as wear skeleton shows well strength and wear resistance.The wear mechanism of Fe-B-Nb-Ni abrasive wear resistant layer was mainly plough and brittle peeling.
出处
《焊接》
北大核心
2013年第2期29-32,70,共4页
Welding & Joining
关键词
钻杆耐磨带
药芯焊丝
堆焊
耐磨性
hardbanding
flux cored wire
hardfacing
wear resistance
