摘要
采用新型铁-碳-铬-钒-钛系药芯焊丝和埋弧焊方法制备出含有初生M7C3相的堆焊层,借助光学显微镜、扫描电镜和X射线衍射仪等研究了堆焊层的显微组织及碳化物的分布、形貌,并对其进行了磨粒磨损试验。结果表明:堆焊层的显微组织由马氏体+铁素体+残余奥氏体+M7C3+M3C+VC等组成,当碳含量为1.45%和2.05%时,尺寸为10～25μm的初生M7C3相数量较多;初生M7C3相的数量和尺寸对堆焊层耐磨性能影响显著,其磨损机制以磨粒的显微切削为主。
A new type Fe-C-Cr-V-Ti flux-cored wire was used to prepared the surfacing layer containing primary M7C3 phase by submerged arc welding method.The microstructure and carbide distribution,morphology of the surfacing layer were investigated by means of optical microscope,scanning electron microscope and X-ray diffraction.The abrasive wear tests were performed.The results show that the microstructure of the surfacing layer was composed of martensite,ferrite,residual austenite,M7C3,M3C and VC.When the carbon concentration was 1.45wt% and 2.05wt%,the amount of the primary M7C3 phase with the size of 10-25 μm was the most.The effects of the amount and size of the primary M7C3 phase on the wear resistance of the surfacing layer were significant,and the main wear mechanism was the micro-cutting of abrasive particles.
出处
《机械工程材料》
CAS
CSCD
北大核心
2010年第11期42-45,共4页
Materials For Mechanical Engineering
基金
湖南省科技攻关计划资助项目(2006GK3087)
湘潭大学科研启动基金资助项目(06QDZ05)
关键词
耐磨性能
显微组织
初生相
堆焊
药芯焊丝
wear resistance
microstructure
primary phase
surfacing
flux-cored wire
