气体软氮化是以渗氮为主的低温氮碳共渗,钢表面渗入氮原子的同时,还有少量的碳原子渗入而形成极其细小的碳化物,碳化物作为媒介可促进渗氮.由于该工艺处理温度低,时间短,所以工件变形小,脆性低.综述了以提高表面硬度、抑制表层脆性、高温短时等为主的气体软氮化工艺的发展状况,分别从稀土催渗、多元共渗、周期循环渗氮、可控气氛渗氮和奥氏体软氮化等5个方面阐述了气体软氮化渗层性能的影响机理和研究现状,并介绍了35钢增压喷丸表面纳米化对气体软氮化过程的影响,展望了表面纳米化用于气体软氮化的发展前景.
Gas soft-nitriding is low-temperature nitrocarburising which is mainly based on nitriding. While the nitrogen atoms infiltrate into the steel, a small number of carbon atoms infiltrate as well to form some extremely small carbides, which act as the medium for nitriding. As the processing temperature is low and the time is short, so the deformation of the steel would become small, brittle could also be reduced. The development of gas soft nitriding, which could improve the surface hardness, inhibit the surface brittle and possess the properity of high-temperature and short-time, was reviewed; The mechanism and reasearch of the performance of gas soft-nitrided layer were described from five aspects respectively as followes: rare-earth catalyzing infiltration, multicomponent co-cementation, cyclic nitriding, controlled atmosphere nitriding and austenitic soft-nitriding. The influences of nano-crystallization by surface strengthens pressure shot penning on gas soft-nitriding of 35 steel were introduced; Development perspectives of the surface nanocrystallization for soft nitriding process were forecasted.
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