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使用3 kW矩形连续波CO2激光器,在Q235钢表面制备原位自生VC-Cr7C3复相陶瓷增强铁基复合涂层。利用扫描电镜、电子能谱和X射线衍射仪研究了涂层的显微组织,并对其硬度进行了测试。结果表明:涂层中原位合成了VC-Cr7C3复相陶瓷颗粒;从涂层底部到顶部,颗粒相的含量逐步增加;颗粒尺寸为3～7μm,且无明显团聚形象。涂层的平均硬度高达1050 HV,明显高于基体平均硬度,其硬度提高主要是由于涂层中高硬度VC-Cr7C3复相陶瓷颗粒相的形成。
In-situ VC-Cr7C3 composite reinforced iron-based composite coatings were prepared on the Q235 steel surface using a 3 kW rectangular continuous wave CO2 laser. The microstructure of the coating was studied by scanning electron microscopy, electron spectroscopy and X-ray diffraction. The hardness of the coating was tested. The results show that the VC-Cr7C3 composite ceramic particles were synthesized in-situ in the coating. The grain-phase content gradually increased from the bottom to the top of the coating. The grain size was 3 ~ 7μm with no agglomeration. The average hardness of the coating is as high as 1050 HV, which is obviously higher than the average hardness of the matrix. The increase of the hardness is mainly due to the formation of the VC-Cr7C3 composite phase with high hardness in the coating.