中文摘要：

研究了热处理工艺对17—4PH不锈钢抗菌性能的影响。结果表明，冷处理并在482℃时效能有效提高17—4PH不锈钢的抗菌性能和硬度，提高时效温度使17—4PH不锈钢的杀菌率增加，但是其硬度明显降低；时效时间增加，杀菌率提高，但是硬度略有降低。冷处理促进马氏体分解，位错密度增大，从而促进了富Cu相的析出。17—4PH不锈钢最优的抗菌热处理工艺制度为：1040℃固溶处理／0．5h＋液氮冷处理／0．5h＋482℃时效处理／6h。

英文摘要：

The antibacterial performance of 17-4PH stainless steel by different heat treatments was investigated. The results show that aging at 482℃ after cryogenic treatment at liquid nitrogen can effec- tively improve the antibacterial rate and hardness of 17-4PH steel, and the antibacterial rate increased with the increase of both aging temperature and aging time, but the hardness declined. The cryogenic treatment can promote the decomposition of the martensite, and then the dislocation density in 17-4PH steel become larger, which could increase the Cu-rich precipitations in the steel matrix and improve the antibacterial performance of the steel. An optimal antibacterial heat treatment procedure for 17-4 PH steel is recommended as solution treatment at 1040℃/0.5 h＋cryogenic treatment/0.5h＋aging at 482℃/6 h.