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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。
Using plasma surface cladding technique, boron-free and boron-based (other powder components remain unchanged) iron-based alloy coatings are clad on Q235 base steel. The microstructure, phase composition and microhardness of the coating were analyzed by optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), electron microprobe (EMPA) and microhardness tester. The results show that the content of (Fe, Cr) 7 (C, B) 3 and other carbide phases in boron - And produced a large amount of eutectic boride FeB and a small amount of Fe2B, uniformly dispersed in the coating; there is interstitial dissolved boron in α-Fe; and with the increase of boron content of the powder composition, (Fe, Cr) 7 (C, B) 3 The content of boride phase increases, and the average and maximum microhardness values of the cladding coatings increase accordingly.