【摘要】 考察了 316 L奥氏体不锈钢高温氮离子注入层的摩擦磨损性能 ,并分析了其组织结构 .结果表明 :在相同注入工艺条件下 ,高温注入后的含氮层深度较常温注入下的提高约 10倍 ;在 15 0～ 46 0℃下注入处理时 ,在距离注入层表面大约 40 nm深度内的组织结构与注入温度有关 ,含氮层主要以膨胀奥氏体组织为主 ;由于膨胀奥氏体、Cr N和微晶组织等对含氮层的强化作用 ,使显微硬度显著提高 ,摩擦系数明显下降 ,耐磨性能得到改善 ;46 0℃下注入处理后试样的摩擦系数较 15 0℃下处理后的略高 ,而前者的耐磨性明显较高 .更多还原

【Abstract】 The microstructure and tribological properties of 316L stainless steel implanted with nitrogen at elevated temperature have been investigated. As the results, the depth of the N containing layer of 316L stainless steel implanted at elevated temperature is nearly 11 times of that implanted at ambient temperature. The N containing layer of about 40 nm thick on the stainless steel surface implanted from 150 ℃ to 460 ℃ is mainly composed of expanding austenite that strengthens the surface layer. Thus the microhardness and wear resistance of the surface layer of stainless steel implanted from 150 ℃ to 460 ℃increases significantly, while the friction coefficient in dry sliding decreases greatly. Though the friction coefficient for the specimen implanted at 460 ℃ is a little bit higher than that implanted at 150 ℃, the former shows higher wear resistance due to the formation of a strengthening layer over 2 μm thick.更多还原