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采用自主研发的低温气体渗碳技术对AISI316奥氏体不锈钢进行处理,目的是增强耐磨性且不损害其耐蚀性。对低温气体渗碳层显微组织、硬度梯度、耐蚀性和耐磨性进行分析。结果表明:低温气体渗碳层硬度梯度变化与其组织和碳浓度有一定关系,随渗碳层深度的不同表现出不同的组织和性能。低温气体渗碳处理前后AISI316奥氏体不锈钢的磨损机制由粘着磨损转变成磨粒磨损,S相是提高耐磨性的主要因素,470℃时表现出较好的耐磨性,其耐蚀性基本保持不变。
AISI316 austenitic stainless steel is treated with a self-developed cryogenic gas carburizing technology to enhance wear resistance without compromising corrosion resistance. The microstructure, hardness gradient, corrosion resistance and wear resistance of carburized carburized layer were analyzed. The results show that the hardness gradient of carburized layer has a certain relationship with the microstructure and carbon concentration, and shows different microstructure and properties with the depth of carburized layer. The wear mechanism of AISI 316 austenitic stainless steel before and after low-temperature carburizing treatment changes from adhesive wear to abrasive wear. S phase is the main factor to improve the wear resistance and shows good wear resistance at 470 ℃, and its corrosion resistance Maintain unchanged.