摘要
采用等离子表面熔覆技术,以高能等离子束为热源在Q235基体钢板上熔覆无钛以及含钛(其它粉末成分基本不变)的铁基合金涂层.利用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)、电子探针(EPMA)、显微硬度计对涂层的组织、相组成和显微硬度等进行分析.结果表明,与无钛铁基粉末涂层相比,含钛铁基合金熔覆层晶粒组织明显细化,且含有较多带状晶,但随着合金粉末中钛含量的增多,熔覆层共晶组织中硬质相(Cr,Fe)7C3逐渐增多,抑制了硬质相的析出,熔覆涂层的平均和最高显微硬度值也相应降低.
Fe-based alloy coatings,with and without adding titanium(keeping other powder ingredients constant),were produced on Q235 steel substrate by plasma cladding process with high-energy plasma jet as the heat source.The microstructure,phase composition and microhardness of the coatings were investigated by optical microscope(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD),electron probe microanalysis(EPMA) and microhardness tester,respectively.The results showed that the grain of the Fe-based coating containing Ti was obviously finer than that without Ti,and more band-like crystals formed in the coatings containing Ti.However,with the increase of Ti content in the coating,the hard phase(Cr,Fe)7C3 in the eutectic increased gradually and restrained the precipitation of carbides in the coating,consequently,the average and maximum microhardness of the cladding coating decreased.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2013年第6期61-64,116,共4页
Transactions of The China Welding Institution
基金
山东省自然科学基金资助项目(ZR2011EMM017)
山东省高等学校科技计划资助项目(J12LA56)
关键词
等离子熔覆
碳化钛
晶区分布
plasma cladding
titanium carbide
crystal distribution
