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利用脉冲单电源在碳钢表面进行等离子渗铬,对850℃和1100℃条件下得到的渗层组织进行了分析。结果表明:850℃所得渗层和基体之间有两条明显的分界线,说明在渗铬过程中,发生了两次反应扩散相变;在1100℃条件下,渗层和基体之间有一条明显的分界线,说明在渗铬过程中,发生了一次反应扩散相变;两种工艺得到的渗层厚度分别为170μm和140μm,表面的含铬量分别为9.25%和40%(质量分数),渗铬层主要相组成为Fe-Cr固溶体;在1100℃条件下,渗层是由沉积层+扩散层组成,沉积层的形成阻碍了扩散层的进一步加厚。
Pulsed single power supply was used to plasma-chromate the surface of carbon steel, and the infiltrated microstructure was analyzed at 850 ℃ and 1100 ℃. The results show that there are two obvious demarcation lines between the infiltrated layer and the matrix at 850 ℃, indicating that two reaction-diffusion transformations occur during the chromizing process. At 1100 ℃, there is one The clear dividing line indicates that during the chromizing process, a reaction-diffusion transformation took place. The thickness of the two layers obtained was 170μm and 140μm, respectively, and the content of chromium in the surface was 9.25% and 40% respectively (mass fraction) , The main phase of the chromizing layer is composed of Fe-Cr solid solution. At 1100 ℃, the diffusion layer is composed of the deposition layer and the diffusion layer, and the formation of the deposition layer hinders the further thickening of the diffusion layer.