Combined macro-meso scale modeling of the nitriding process by the IDW interpolation method
The nitriding process is one of the most important thermochemical heat treatment processes in metallurgy for the production of case-hardened surface layers in low-carbon steel. The diffusion of nitrogen into steel leads to formation of a nitrided layer, which comprises an extremely thin outer compound layer (ε+ γ) and a thick inner diffusion layer (α). The improvement of corrosion and wear properties can be attributed to the compound layer. Therefore, it is necessary to predict the phase composition of the compound layer. A macro-meso coupled model has been developed which combines finite difference (FD) model at the macro-scale with a phenomenological model at a meso-scale. The macro model is used to calculate the diffusion process of nitrogen. The meso model is implemented to simulate the iron-nitrogen (Fe-N) phase composition and hardness. The macro model and meso model are linked by Inverse Distance Weighting (IDW) interpolation method. The macro-meso model is employed to simulate the nitriding process of low-alloy steels. The comparison between simulated results and experimental ones shows the reliability of the macro-meso model.
Nitriding Macro-meso coupled model Inverse Distance Weighting Iron-nitrogen phase Hardness
Dongying Ju Xiaohu Deng
Department of Mechanical Engineering, Saitama Institute of Technology, Saitama, 369-0293,Japan School of Mechanical Engineering, Tianjin University of Technology and Education, Tianjin, 300222, C
国际会议
北京
英文
893-897
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）