论文部分内容阅读
研究了经不同加热温度锻造、固溶和７５０℃时效后钢的晶粒度、孪晶、碳化物的分布及纯氨和氨加氩做介质离子渗氮后渗层组织、相组成、应力状态、氮碳浓度分布、剥落坑形貌。分析表明：纯氨离子渗氮后表面层的碳向里扩散，并出现一峰值；氨加氩渗氮降低了渗层中氮浓度，从而降低了渗层中的应力，这是消除该钢渗氮层剥落的有效途经。
The grain size, twin and carbide distribution of the steel after forging at different heating temperature, solution treatment and aging at 750 ℃ were studied. The microstructure, phase composition and stress state of the steel after plasma nitriding with pure ammonia and ammonia plus argon , Nitrogen and carbon concentration distribution, peel pit morphology. The results show that the carbon in the surface layer diffuses and shows a peak value after the pure ammonia ion nitriding. Ammonia plus argon nitriding reduces the nitrogen concentration in the diffusion layer, thus reducing the stress in the diffusion layer, which is to eliminate the steel seepage Effective way to peel nitrogen layer.