一、引言虽然氨气氮化是迄今使用最普遍的氮化方法,但离子氮化工艺近年来在工业应用上日益变得重要,[1-3]已有大量研究成果报导[4-9]。曾经有许多关于Fe—N二元合金的组织与形貌的研究[9-12],而关于低合金钢和高合金钢氮化层组织的研究是比较少的。Philips和Seybolt[9]将Fe—1 Cr—0.4C钢、Fe—1 Cr—1.2Al—0.4C钢和Fe—1 Gr—2Ti—0.4C钢进行氮化,他们发现这些钢的显微组织与Fe—N二元合金的组织相似,还存在相对粗的 I. INTRODUCTION Although ammonia gas nitriding is by far the most commonly used nitriding method, the ion nitriding process has become increasingly important in industrial applications in recent years [1-3] and a large number of studies have reported [4-9] . There have been many studies on the microstructure and morphology of Fe-N binary alloys [9-12], while the research on the nitride layer structure of low-alloy steel and high-alloy steel is relatively rare. Nitriding Fe-1 Cr-0.4C steel, Fe-1 Cr-1.2Al-0.4C steel and Fe-1 Gr-2Ti-0.4C steel by Philips and Seybolt [9] found that the microstructure of these steels Similar to the structure of Fe-N binary alloys, there is also relatively coarse