Tribological behaviors of Fe-Al-Cr-Nb alloyed layer deposited on 45 steel via double glow plasma surface metallurgy technique

采用双辉等离子表面冶金技术在45钢表面制备Fe-Al-Cr-Nb合金层的摩擦性能（英文）

Double glow plasma surface metallurgy technique was used to fabricate a Fe?Al?Cr?Nb alloyed layer onto the surface of the 45 steel. The microstructures and composition of th?eA Fl?eCr?Nb alloyed layer were analyzed by scanning electronic microscopy, X-ray diffraction and energy dispersive spectroscopy. The results indicate thatthe 20 μm alloyed layer is homogeneous and compact. The alloyed elements exhibit a gradient distribution along the cross section. Microhardness and nanoindentation tests imply that the surface hardness of the alloyed layer reaches HV 580, which is almost 2.8 times that of the substrate. Compared with the substrate, the alloyed layer has a much smaller displacement and a larger elastic modulus. According to the friction and wear tests at room temperature, the? FeAl?Cr?Nb alloyed layer has lower friction coefficient and less wear mass, implying that the Fe?Al?Cr?Nb alloyed layer can effectively improve the surface hardness and wear resistance of the substrate.

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。