Finite Element Modeling and Experimental Verification of Nitriding Process in S30C Steel
Finite Element Modeling and Experimental Verification of Nitriding Process in S30C Steel
复制标题
S30C钢渗氮过程的有限元建模与实验验证
DOI：
10.1590/1980-5373-mr-2016-0531
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发表时间：
2017
影响因子：
1.7
通讯作者：
Min Li
中科院分区：
文献类型：
--
作者：
X. Deng;D. Ju;Min Li
建立了一个模拟普碳钢渗氮过程的数学模型，该模型考虑了氮在不同Fe-N相中的同时扩散以及Fe 2 O3和铁氮化物的析出动力学。该模型可以预测氮浓度、Fe-N相体积分数和硬度的分布。此外，本文还提出了一种有限元后处理技术，避免了有限元网格优化的局限性，节省了计算时间。网格局部加密算法采用均匀和除算法。采用改进的反距离加权法对有限元模拟结果进行插值。然后，氮化模型和后处理技术的框架内开发的有限元程序COSMAP（计算机模拟的MANUFACTURING过程）的基础上金属热力学理论。为了验证渗氮模型和有限元后处理技术的有效性，利用COSMAP软件对S30 C钢的渗氮过程进行了数值模拟。模拟得到的氮含量和硬度分布与实测值吻合较好。此外，还对二维模型在不同网格尺寸下的模拟结果进行了比较。结果表明，插值结果与细网格模型的模拟结果和实验结果吻合较好.关键词：有限元，渗氮，S30 C，氮化铁，反距离加权
A mathematical model has been developed to simulate the nitriding process of plain carbon steel, considering the simultaneous diffusion of nitrogen in different iron-nitrogen (Fe-N) phases and the precipitation dynamics of γ’e and iron-nitride. The model can predict the distribution of nitrogen concentration, volume fraction of Fe-N phases and hardness. Furthermore, a finite element method (FEM) post-process technology is presented to avoid the limit of FEM mesh improvement and time-saving. The uniform-sum-division algorithm is adopted as local refinement algorithm (LRA) of meshes. The modified inverse distance weighting (IDW) method is used to interpolate the FEM simulated results. Then, the nitriding model and post-process technology are incorporated within the framework of the developed FEM code COSMAP (COmputer Simulation of MAnufacturing Process) based on metallo-thermo-mechanical theory. In order to validate the nitriding model and FEM post-process technology, the nitriding process of S30C steel is modeled by COSMAP software. The simulated distributions of nitrogen content and hardness are consistent with the measured ones. In addition, the simulated results at different mesh size are compared for two-dimensional model. It is indicated that the interpolated results agree well with the simulated results of fine mesh model and the experimental ones.Keywords: finite element, nitriding, S30C, iron nitride, inverse distance weighting