Modeling the Nitrogen Diffusion Enhancement Resulting from a NanoPeening® Treatment on a Pure Iron – Influence of the Grain Morphology

Abstract:

It is well known that nanocrystalline materials have enhanced diffusion properties due to their high grain boundary density which act as fast diffusion channels compared to the lattice. In this paper, we aim at simulating the nitriding process of a pure iron nanostructured by NanoPeening® process. We use a simple diffusional approach taking into account the grain size and the grain morphology resulting from the NanoPeening® treatment. EBSD measurements are carried out to extract morphological parameters which are used in the homogenization method to extract the effective diffusivity distribution. Then a 1D diffusion simulation is performed with this distribution and shows that the grain morphology resulting from the NanoPeening® treatment does not deteriorate the diffusion properties of the material but in fact, improves the nitrogen penetration depth and the diffusion kinetics in addition to the effect of the grain size reduction.

• Periodical: Defect and Diffusion Forum (Volume 363)
• Pages: 178-185
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.363.178
• Online since: May 2015
• Authors: Victor Lacaille, Guillaume Kermouche, David Yezid Tumbajoy-Spinel, Eric Feulvarch, Constance Morel, Jean Michel Bergheau
• Keywords: Aspect Ratio, Diffusion, Finite Element, Grain Morphology, Grain Size, Nanocrystalline, Nitriding

References

[1] K. Lu et J. Lu, «Nanostructured surface layer on metallic materials induces by surface mechanical attrition treatment, » Materials Science & Engineering, A, Vols. %1 sur %2375-377, pp.38-45, (2004).

DOI: 10.1016/j.msea.2003.10.261

[2] T. Roland, D. Retraint, K. Lu et J. Lu, «Fatigue life improvement through surface nanostructuring of stainless steel by means of surface mechanical attrition treatment, » Scr. Mater., vol. 54, pp.1949-1954, (2006).

DOI: 10.1016/j.scriptamat.2006.01.049

[3] N. Tao, Z. Wang, W. Tong, M. Sui, J. Lu et K. Lu, «An investigation of surface nanocrystallization mechanism in Fe induced by surface mechanical attrition treatment, » Acta Mater., vol. 50, pp.4603-4616, (2002).

DOI: 10.1016/s1359-6454(02)00310-5

[4] W. Tong, N. Tao, Z. Wang, J. Lu et K. Lu, «Nitriding Iron at Lower Temperatures, » Science, vol. 299, pp.686-688, (2003).

DOI: 10.1126/science.1080216

[5] H. -W. Zhang, L. Wang, Z. -K. Hei, G. Liu, J. Lu et K. Lu, «Low-temperature plasma nitriding of AISI 304 stainless steel with nano-structures surface layer, » Z. Metallkd., vol. 10, pp.1143-1147, (2003).

DOI: 10.3139/146.031143

[6] Y. Lin, J. Lu, L. Wang, T. Xu et Q. Xue, «Surface nanocrystallization by surface mechanical attrition treatment and its effect on structure and properties of plasma nitrided AISI 321 stainless steel, » Acta Mater., vol. 54, pp.5599-5605, (2006).

DOI: 10.1016/j.actamat.2006.08.014

[7] W. -P. Tong, C. Liu, W. Wang, N. -R. Tao, Z. -B. Wang, L. Zuo et J. -C. He, «Gaseous nitriding of iron with a nanostructured surface layer, » Scr. Mater., vol. 57, pp.533-536, (2007).

DOI: 10.1016/j.scriptamat.2007.05.017

[8] S. -M. Hassani-Gangaraj, A. Moridi, M. Guagliano, A. Ghidini et M. Boniardi, «The effect of nitriding, severe shot peening and their combination on the fatigue behavior and micro-structure of a low-alloy steel, » International Journal of Fatigue , vol. 62, pp.67-76, (2014).

DOI: 10.1016/j.ijfatigue.2013.04.017

[9] S. -M. Hassani-Gangaraj, A. Moridi, M. Guagliano et A. Ghidini, «Nitriding duration reduction without sacrificing mechanical characteristics and fatigue behavior: The beneficial effect of surface nano-crystallization by prior severe shot peening, » Materials & Design, vol. 55, pp.492-498, (2014).

DOI: 10.1016/j.matdes.2013.10.015

[10] T. Prezeau, T. Muller, E. Dransart et Y. Giraud, «Amélioration par un prétraitement mécanique de NanoPeening, des performances des traitements thermochimiques : Cas de la nitruration et de la carbonitruration basse pression., » Traitements et Matériaux, vol. 412, pp.37-43, (2011).

DOI: 10.51257/a-v1-m1224

[11] D. Gryaznov, J. Fleig et J. Maier, «Finite element simulation of diffusion into polycrystalline materials, » Solid State Sci., vol. 10, pp.754-760, (2008).

DOI: 10.1016/j.solidstatesciences.2008.03.030

[12] I. -V. Belova et G. -E. Murch, «Diffusion in nanocrystalline materials, » Journal of Physics and Chemistry of Solids , vol. 64, pp.873-878, (2003).

DOI: 10.1016/s0022-3697(02)00421-3

[13] L. Bassman, N. Ibrahim, P. Pinsky, K. Saraswat et M. Deal, «Mesoscale Modeling of Diffusion in Polycrystalline Structures, » chez Simulation of Semiconductor Processes and Devices, 1997. SISPAD '97., 1997 International Conference on, (1997).

DOI: 10.1109/sispad.1997.621359

[14] E. Hart, «On the role of dislocations in bulk diffusion, » Acta Metallurgica, vol. 5, p.597, (1957).

[15] V. Lacaille, E. Feulvarch, G. Kermouche, C. Morel et J. -M. Bergheau, «Finite element analysis of the grain size effect on diffusion in polycrystalline materials, » Com. Mat. Sci., (2014).

DOI: 10.1016/j.commatsci.2014.07.026

[16] V. Lacaille, G. Kermouche, D. -Y. Tumbajoy-Spinel, E. Feulvarch, C. Morel et J. -M. Bergheau, «Modeling the nitriding enhancement resulting from the NanoPeening treatment of a pure iron, » IOP Conf. Series : Materials Science and Engineering, vol. 63, (2014).

DOI: 10.1088/1757-899x/63/1/012124

[17] «DREAMD 3D, » 2014. [En ligne]. Available: http: /dream3d. bluequartz. net.

[18] C. Herzig et Y. Mishin, chez Diffusion in Condensed Matter Chap. 8, Springer, 2005, pp.337-366.

[19] «Sysweld User's manual, » (2014).

[20] W. -P. Tong, Z. Han, L. -M. Wang, J. Lu et K. Lu, «Low-temperature nitriding of 38CrMoAl steel with a nanostructured surface layer induced by surface mechanical attrition treatment, » Surf. Coat. Tech., vol. 202, pp.4957-4963, (2008).

DOI: 10.1016/j.surfcoat.2008.04.085