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采用双辉等离子表面冶金技术在45钢基体表面制备Fe-Al-Cr-Nb合金层。利用扫描电镜、能谱仪和X射线衍射仪对该合金层的显微组织和物相组成进行表征。结果表明,该合金层表面形貌完整且致密;厚度约为20μm;各合金元素含量沿截面方向呈梯度分布。显微硬度和纳米压痕实验表明,Fe-Al-Cr-Nb合金层的表面硬度为HV 580,约为基体45钢的2.8倍;与基体相比,该合金层具有较小的位移偏移量和较大的弹性模量。通过室温摩擦磨损实验表明,Fe-Al-Cr-Nb合金层的摩擦因数低且磨损量小,说明该合金层可显著提高基体的表面硬度和耐磨性。
The double-hull plasma surface metallurgy was used to prepare the Fe-Al-Cr-Nb alloy layer on the surface of 45 steel substrate. The microstructure and phase composition of the alloy layer were characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The results show that the surface morphology of the alloy layer is complete and compact; the thickness is about 20μm; the contents of alloying elements are gradient along the cross-section. Microhardness and nanoindentation experiments show that the surface hardness of the Fe-Al-Cr-Nb alloy layer is HV 580, about 2.8 times that of the base 45 steel; the alloy layer has a smaller displacement offset than the substrate Amount and larger modulus of elasticity. The room temperature friction and wear tests show that the friction coefficient of the Fe-Al-Cr-Nb alloy layer is low and the amount of wear is small, indicating that the alloy layer can significantly improve the surface hardness and wear resistance of the substrate.