【摘要】 借助 X射线分析方法 ,研究了 4 0 Cr钢经不同时间渗氮处理后渗氮层ε相的形成以及经不同氨流量和温度渗氮后的转变。结果表明 ,在渗氮温度和氨流量相同的条件下 ,渗氮层深度和ε相体积分数随渗氮时间的延长而增加 ,在一定时间后 ,渗氮层深度增加缓慢 ,相组成几乎不再随渗氮时间变化。调整渗氮温度和氨流量 ,通过渗氮温度和气氛氮势的变化 ,可有效地控制渗氮层形成和转变 ,以加快离子渗氮速度更多还原

【Abstract】 The formation of ε phase in ion nitrided layer of 40Cr steel via different nitriding time and its transformation under different ammonia flow and nitriding temperature have been researched by X ray diffraction.It was showed that the nitrided layer depth and ε phase volume percent had been respectively increased with having prolonged nitriding time under same temperature and ammonia flow,but the nitrided layer depth had been slowly increasd and phase constitution hardly had been changed after certain time.Having adjusted nitriding temperature and ammonia flow will effectively control ion nitrided layer formation and transformation and speed ion nitriding by change of nitriding temperature and nitrogen potential.更多还原