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采用不同温度对Cr12MoV钢进行电弧等离子体辅助渗氮处理。采用X射线衍射(XRD)分析渗氮层的相组成,采用扫描电子显微镜(SEM)及光学显微镜分别观察渗氮样品表面形貌及横截面形貌,利用显微硬度计测试渗氮层的硬度分布。结果表明:实验钢渗氮层的结构由CrN+γ’-Fe4N+ε-Fe3N的化合物层及由含氮马氏体相α-Fe(N)组成,渗氮层的厚度随处理温度的升高而增加。渗氮处理后能明显提高Cr12MoV钢基体的显微硬度。
Arc-plasma-assisted nitriding treatment of Cr12MoV steel at different temperatures. The phase composition of nitrided layer was analyzed by X-ray diffraction (XRD). The surface morphology and cross-sectional morphology of nitrided sample were observed by scanning electron microscope (SEM) and optical microscope respectively. The hardness of nitrided layer distributed. The results show that the structure of nitrided layer is composed of compound layer of CrN + γ’-Fe4N + ε-Fe3N and α-Fe (N) containing nitrided martensite. The thickness of nitrided layer increases with the increase of treatment temperature High and increase. After nitriding treatment can significantly improve the hardness of Cr12MoV steel substrate.