文章基本信息

标题：Model for Predicting Microhardness Profiles of Steel after Nitriding
本地全文：下载
作者：V. Horák ; V. Hrubý ; T. Mrázková 等
期刊名称：Advances in Military Technology
印刷版ISSN：1802-2308
电子版ISSN：2533-4123
出版年度：2013
卷号：8
期号：2
语种：English
出版社：University of Defence
摘要：The plasma nitriding process produces a hard near-surface thin layer of the nitrided material. The thickness of the diffused layer,produced in the course of this process,is between 0.001 and 0.6 mm. The paper presents a study of influence of the nitriding temperature,pressure,and time on the steel microhardness profiles. The one- dimensional transient diffusion model is applied to a thin nitrided layer. That allows one to predict the material hardness distribution within the near-surface layer as a function of time for a modified nitrogen diffusion coefficient. The temperature and pressure dependence of the diffusion coefficient is considered. Hence,the model involves the reaction rates of nitrides formation. The solution obtained in this way is compared with experimental data for a decrease of hardness as a function of depth and time,until the core hardness is reached.
关键词：Diffusion;nitriding;surface hardness;logistic function