Model for Predicting Microhardness Profiles of Steel after Nitriding

Authors

  • Vladimír Horák University of Defence

DOI:

https://doi.org/10.3849/aimt.01001

Abstract

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 nitride 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 thus obtained is compared with experimental data for a decrease of hardness as a function of depth and time, until the core hardness is reached.

Author Biography

Vladimír Horák, University of Defence

Department of Mechanical Engineering, professor

References

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HORÁK, V., KULISH, V., HRUBÝ, V. and MRÁZKOVÁ, T. Model of the Hardness Prediction for the Diffusion. In. 9th Int. Conference on Mathematical Problems in Engineering, Aerospace and Sciences “ICNPAA 2012”. New York: American Institute of Physics, Conf. Proc. 1493, 2012, pp. 486-491.

DIN 50190-4: 1999. Hardness depth of heat-treated parts - Part 4: Determination of the diffusion hardening depth and the diffusion depth.

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POKORNÝ, Z., KADLEC, J., HRUBÝ, V., JOSKA, Z., TRAN, D.Q. and BERAN, D. Plasma Nitriding of Bored Barrels. Advances in Military Technology, 2011, Vol. 6, No. 1, pp. 69-75.

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Published

31-12-2013

How to Cite

Horák, V. (2013). Model for Predicting Microhardness Profiles of Steel after Nitriding. Advances in Military Technology, 8(2). https://doi.org/10.3849/aimt.01001

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