Influence of La2O3 addition on microstructure and wear resistance of Fe-Cr-C cladding formed by arc surface welding
来源期刊：JOURNAL OF RARE EARTHS2012年第10期
论文作者：周野飞 杨育林 齐效文 姜永文 杨健 任学军 杨庆祥
文章页码：1069 - 1074
摘 要：The Fe-Cr-C claddings formed by arc surface welding with different La2O3 additions were investigated. The microstructures were observed by optical microscopy （OM）, field emission scanning electron microscopy （FESEM） and transmission electron microscopy （TEM）. The phase structures were measured by X-ray diffraction （XRD）. The wear resistances of the claddings were tested by friction and wear experiment. On this basis, the carbide refinement mechanism by inclusion enriched with La was discussed theoretically. The results showed that, the microstructure of the Fe-Cr-C cladding consisted of primary （Cr,Fe）7C3 carbides and eutectic （γ-Fe+（Cr,Fe）7C3 ） structure. With La2O3 addition increasing, the primary carbides were refined, and the mass loss of the cladding decreased gradually. The Fe-Cr-C cladding with 4wt.% La2O3 addition had a best wear resistance behaviour. The RE inclusion LaAlO3 as heterogeneous nuclei of the primary M7C3 was medium effective, and could refine the M7C3 carbides. Besides, the wear resistance could be improved by adding La2O3 in the claddings.
周野飞1，杨育林1，齐效文1，姜永文1，杨健1，任学军2，杨庆祥1
1. State Key Laboratory of Metastable Materials Science & Technology, Yanshan University2. School of Engineering, Liverpool John Moores University
摘 要：The Fe-Cr-C claddings formed by arc surface welding with different La2O3 additions were investigated. The microstructures were observed by optical microscopy （OM）, field emission scanning electron microscopy （FESEM） and transmission electron microscopy （TEM）. The phase structures were measured by X-ray diffraction （XRD）. The wear resistances of the claddings were tested by friction and wear experiment. On this basis, the carbide refinement mechanism by inclusion enriched with La was discussed theoretically. The results showed that, the microstructure of the Fe-Cr-C cladding consisted of primary （Cr,Fe）7C3 carbides and eutectic （γ-Fe+（Cr,Fe）7C3 ） structure. With La2O3 addition increasing, the primary carbides were refined, and the mass loss of the cladding decreased gradually. The Fe-Cr-C cladding with 4wt.% La2O3 addition had a best wear resistance behaviour. The RE inclusion LaAlO3 as heterogeneous nuclei of the primary M7C3 was medium effective, and could refine the M7C3 carbides. Besides, the wear resistance could be improved by adding La2O3 in the claddings.
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