摘要：對HP40Nb耐熱鋼行粉末法滲鋁，通過改善材料表面的成分和組織，可以提高其在高溫和含碳氣氛環境下的抗氧化和抗滲碳性能。耐熱鋼的常規粉末法滲鋁往往要在高溫下（1000℃以上）通過長時間保溫來實現，不僅生產成本高，還會對基體材料組織與性能帶來負面影響。本實驗對耐熱鋼表面進行在交流電場作用下的粉末包埋法滲鋁研究，優化滲劑配比以及滲鋁工藝。粉末包埋法滲鋁在700℃-800℃下進行。采用X射線衍射儀分析了滲鋁層組織的相成分，并利用顯微硬度計對滲鋁層的力學性能進行了測試。實驗發現，相對于常規的包埋法滲鋁，電場增強粉末法滲鋁具有更低的外熱溫度和較快的滲速，可以顯著提高實驗效率和滲劑的利用率；提高溫度，增大交流電場電流可以增加滲鋁層的滲速和厚度。

關鍵詞：粉末包埋法滲鋁；耐熱鋼；交流電場

Abstract:The HP40Nb heat-resistant steel’s anti-oxidation property and anti-carburizing property in high temperature and carbon-containing atmosphere environment can be improved by pack aluminizing to improve material’s surface components and structure. The conventional pack aluminizing of heat-resistant steel was carried out by long time thermal retardation at high temperature (above 1000℃) which costs much and has negative impact on matrix material’s structure and properties. Researches were carried out on pack cementation aluminizing by applying AC electric field at heat-resistant steel’s surface, optimizing the mixture ratio of agent and aluminizing process. Pack cementation aluminizing was carried at temperature 700℃ to 800℃。 X ray diffraction and microhardness testing were employed for analyzing the phases and hardness of the aluminizing coating structures respectively. The results showed that compared with conventional pack cementation aluminizing, electric field enhanced pack aluminizing can lowered treating temperature and accelerate infiltrating speed so that can remarkably improve the experimental efficiency and the utilization ratio of agents; the aluminizing coating’s penetrating speed and thickness can be improved by increasing the temperature or increasing the AC field current.

Key words：pack aluminizing；Heat resistant steel ；alternating current field