采用等离子表面熔覆技术,在Q235基体钢板上熔覆无硼以及含硼（其它粉末成分不变）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（EMPA）、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,含硼粉末熔覆涂层含有（Fe,Cr）7（C,B）3等硼化物相,含量比无硼粉末涂层的（Fe,Cr）7C3等碳化物相含量明显增多;并且产生了大量的共晶硼化物FeB以及少量的Fe2B,均匀弥散的分布在涂层中;在α-Fe中也有间隙固溶的硼;且随着粉末成分含硼量的增加,（Fe,Cr）7（C,B）3硼化物相含量增多,熔覆涂层的平均和最高显微硬度值也相应增加。
Fe-based alloy coatings with and without boron were prepared on Q235 steel by plasma cladding process.Composition,phases and hardness of the coatings were investigated by means of optical microscope,scanning electron microscopy（SEM）,X-ray diffraction（XRD）,electron probe microanalysis（EPMA） and microhardness test.The results show that more amount of boride of（Fe,Cr）7（C,B）3 is observed in the coatings containing B compared with that of carbide in the coating without B,and a large mount of FeB and a small amount of Fe2B disperse uniformly in the coatings containing B.In addition,some B atoms also dissolve in α-Fe as interstitial atoms.Both the content of eutectic（Fe,Cr）7（C,B）3and hardness of the coatings increase with the increase of content of boron in the alloying powders for plasma cladding.
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