Study on Diffusion Coefficient of Carburizing Process Simulation of 18CrNiMo7-6 Steel
[1]Qin Shengwei,Zhang Yufang,Zhang stick.Study on Diffusion Coefficient of Carburizing Process Simulation of 18CrNiMo7-6 Steel[J].Journal of Zhengzhou University (Engineering Science),2020,41(02):56-60.[doi:10.13705/j.issn.1671-6833.2020.03.006]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
41
Number of periods:
2020 02
Page number:
56-60
Column:
Public date:
2020-05-31
- Title:
- Study on Diffusion Coefficient of Carburizing Process Simulation of 18CrNiMo7-6 Steel
- Keywords:
- DEFORM-HT software; 18CrNiMo7-6 steel; Carburizing simulation; Diffusion coefficient; alloy element; carbide
- CLC:
- -
- DOI:
- 10.13705/j.issn.1671-6833.2020.03.006
- Abstract:
- Based on DEFORM-HT software, the gas carburizing process of 18CrNiMo7-6 steel was numerically simulated: the influence of two different diffusion coefficient models on the carburizing process of alloy steel was studied, that is, the model D(T, C) and the model D(T, M, C) considering temperature, alloy elements, and carbon atoms; and numerical simulation and experimental verification of three carburizing processes with different carburizing layer depths. The distribution of carbon content along the depth of the three carburizing processes was measured by the mechanical stripping method, and compared with the simulation results, it was found that the simulation accuracy of the D(T,M,C) model was higher; but when the carburizing layer depth reached When the thickness is 4 mm, the test results of the surface carbon content are quite different from the simulation, which is because elements such as Cr and Mo combine with carbon atoms to form a large number of carbides during the long-term carburizing process, which reduces the diffusion coefficient of carbon atoms. At the same time, the surface carbon content of the sample reached 1.0%, which was higher than the ambient carbon potential of 0.8% in the last stage of the carburizing process.
- References:
- -
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Last Update:
2020-05-30