42CrMo钢离子渗氮过程氮浓度分布的数值模拟  

Nurmerical simulation of nitrogen concentration profile in 42CrMo steel during plasma nitriding

作　　者：丁一 杨兴宽[2] 彭明霞[2] 申灏[2] 石伟[1] 

机构地区：[1]清华大学机械工程系,北京100084 [2]中国铁道科学研究院金属及化学研究所,北京100081

出　　处：《材料热处理学报》2017年第12期129-138,共10页Transactions of Materials and Heat Treatment

基　　金：国家国际科技合作专项项目(2014DFG72020)

摘　　要：在氨气气氛中对42CrMo试样在510、540和560℃下离子渗氮1、3、5和7 h,并进行微观组织观察、复合层厚度测定、相成分表征和氮浓度分布测定。采用改进Wagner模型实现了对复合层氮浓度与层厚的数值模拟,考虑了(ε+γ')混合相的存在,所建模型对高渗氮量情况的模拟精度较高,复合层厚度的模拟值与实验值的相对误差小于13.6%。实现了对于扩散区α相部分的氮浓度分布模拟,计算结果与实验结果的相对误差小于19%。42 Cr Mo steel samples were plasma nitrided at 510,540,and 560 ℃ for 1,3,5 and 7 h in NH_3 atmosphere. Microstructure and thickness of the compound layer,phase composition and nitrogen concentration profile were analyzed by means of SEM,XRD and GDOES. A modified Wagner model was proposed for the simulation of the compound layer,in which the existence of the（ ε ＋ γ＇） mixed phase was considered. The simulation results show good agreement with the experimental results in the case of high nitrogen content,and the relative error between simulated and experimental values of the compound layer thickness is less than 13. 6%. Numerical simulation of the nitrogen concentration profile of the α phase in the diffusion zone is done and the simulation results are in good agreement with the experimental ones,and the relative error is less than 19%.

关 键 词：渗氮 离子表面处理 42CRMO钢 数值模拟 

分 类 号：TG156.8[金属学及工艺—热处理]