为了提高奥氏体不锈钢零件的使用寿命,利用低温离子渗碳技术对AISI 316L奥氏体不锈钢进行了表面渗碳处理.用X射线衍射仪和光学显微镜分析了渗碳层的微观组织结构,用显微硬度计测试了渗碳层的硬度分布,通过电化学极化曲线测试技术和化学腐蚀试验研究了离子渗碳AISI 316L不锈钢的腐蚀行为.渗碳层为单相碳过饱和奥氏体固溶体,由此明显提高了AISI 316L不锈钢的抗腐蚀性能,渗碳层硬度梯度平缓,表面显微硬度高达900 HV.结果表明,奥氏体不锈钢低温离子渗碳处理不仅提高了其表面硬度,而且提高了不锈钢表面的耐腐蚀性能,从而提高了其使用寿命.
Plasma carburizing of AISI 316L austenitic stainless steel was carried out at low temperature to improve the surface hardness. The microstructure, phase composition and sur-face hardness of the carburized coating were analyzed using an optical microscope, X-ray diffractometer (XRD) and a Vickers hardness tester. The corrosion behavior of the plasma carburized coating on the stainless steel was evaluated by measuring electro-chemical polarization curve and conducting chemical corrosion test as well. Results show that the carburized coating consists of carbon-expanded austenite with significant supersaturation. More-over, the hardness gradient of the carburized coating is mild, and the surface hardness is up to 900 HV0.025. Therefore, plasma car-burizing at low temperature not only increases the surface hard-ness but also increases the corrosion resistance of the anstenite stainless steel, due to the formation of carbon supersaturated solid solution.
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