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采用等离子合金化技术,在含一定碳量的AISI 420F马氏体不锈钢表面制备Zr/Zr C合金层。研究了等离子渗Zr合金化温度和时间对Zr/Zr C合金层组织、相结构、渗层厚度以及硬度和摩擦磨损性能的影响。利用扫描电镜和光导放电光谱分析仪分析Zr/Zr C合金层表面和截面的形貌及成分分布,用X射线衍射表征渗层的物相组成。结果表明:AISI 420F不锈钢渗Zr后,得到组织连续且致密的渗Zr合金层,合金层由表面富Zr层/富Zr C层/Fe-Cr-Zr-C扩散层组成。在900~1000℃合金化范围内,形成的Zr合金层厚度随渗Zr温度的升高由17μm增加至23μm。在950℃渗Zr时,合金层和富Zr C层厚度随着渗Zr时间的延长分别呈直线和抛物线规律增加;渗Zr后试样的硬度最大值为865HV0.025,与基体(269HV0.025)相比有显著提高;摩擦磨损检测表明,与基材相比,AISI 420F不锈钢经渗Zr处理后,划痕宽度由540降低至360μm,摩擦系数由0.8明显降低为0.4左右,耐磨性得到改善。
Plasma alloying technology was used to prepare Zr / Zr C alloy layer on AISI 420F martensitic stainless steel with a certain carbon content. The effects of plasma alloying temperature and time on the microstructure, phase structure, the thickness of the diffusion layer and the hardness and friction and wear properties of the Zr / Zr C alloy were investigated. The morphology and composition distribution of the surface and cross section of the Zr / Zr C alloy layer were analyzed by SEM and photoconductive discharge spectrometer. The phase composition of the layer was characterized by X-ray diffraction. The results show that the infiltration of Zr into AISI 420F stainless steel can result in the continuous and compact infiltration of Zr alloy layer. The alloy layer consists of Zr-rich / Zr-rich C / Fe-Cr-Zr-C diffusion layers. In the range of 900 ~ 1000 ℃, the thickness of the formed Zr alloy layer increases from 17μm to 23μm with the increase of the temperature of the infiltration Zr. When Zr is infiltrated at 950 ℃, the thickness of the alloy layer and the Zr-rich C layer increase linearly and parabolically with the increase of the Zr-infiltration time. The maximum hardness of the sample after infiltration Zr is 865HV0.025, which is close to that of the matrix (269HV0.025 Compared with the substrate, the AISI 420F stainless steel with Zr treatment reduced the scratch width from 540 to 360μm and the friction coefficient decreased from 0.8 to about 0.4, and the wear resistance was obtained improve.