Retained Austenite and Residual Stress Evolution in Carbonitrided Shot-Peened Steel

Abstract:

Carbonitriding followed by shot peening is an important industrial process to improve the mechanical properties of components, especially by producing compressive residual stresses. In addition, a high hardness and strength produced by this process enhances the surface properties and leads also a high resistance to fatigue. In this study, shot peening with different parameters have been employed to treat the carbonitrided specimens. The measurements of residual stress and residual austenite were performed by X-ray diffraction. It is shown, with a simple eigenstrain model, that residual austenite transformation under shot impact contributes to a significant fraction of residual stresses. When the material (750 HV) is peened with 800 HV shot, it represents about 50%, the remaining is due to plasticity. When it is peened with 640HV shot, 100% of residual stresses can be explained by austenite transformation.

• Periodical: Materials Science Forum (Volume 681)
• Pages: 374-380
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.681.374
• Online since: March 2011
• Authors: S. Van Wijk, Manuel François, E. Sura, M. Frabolot
• Keywords: Carbonitriding, Compressive Residual Stress, Residual Austenite, Shot Peening, X-Ray Diffraction (XRD)

References

[1] C. Genzel, W. Reimers, O. Schwarz, J. Grosch, Development of the residual stress state in carburized steels due to austenite transformation by deep-cooling, 3rd European conference on residual stress, (1992), 129-138.

[2] T. Reti, Residual stresses in carburized, carbonitrided, and case hardened components, Handbook of residual stress and deformation of steel, edited by G. Totten, M. Howes, T. Inoue, ASM international, (2003).

[3] D. Kirk, Residual stresses and retained austenite in shot peened steels, 1st International conference on shot peening, ICSP1 (1981).

[4] M. Benedetti, V. Fontanari, B.R. Hohn, P. Oster, T. Tobie, Influence of shot peening on bending tooth fatigue limit of case hardened gears, International journal of fatigue, 24 (2002) 1127-1136.

DOI: 10.1016/s0142-1123(02)00034-8

[5] R.C. Dommarco, K.J. Kozaczek, P.C. Bastias, G.T. Hahn, C.A. Rubin, Residual stresses and retained austenite evolution in SAE 52100 steel under non ideal rolling contact loading, Wear 257 (2004) 1081-1088.

DOI: 10.1016/j.wear.2004.01.020

[6] C. Suryanarayana, M. Grant Norton, X-ray diffraction A practical approach, edited by Plenum, (1998).

[7] J.D. Eshelby, Determination of the elastic field of an ellipsoidal inclusion and related problems, Proc. Roy. Soc. London, series A, vol 241, No 1226, (1957), 376-396.

DOI: 10.1098/rspa.1957.0133

[8] F. Ahdad, M. Desvignes, contraintes résiduelles et deformations plastiques, Matériaux et Techniques, n°5-6, (1996), 46-50.

DOI: 10.1051/mattech/199684050046

[9] T. Michelitsch, A. Wunderlin, Solution of the incompatibility problem in linear three dimensional anisotropic media for an isotropic tensor, (1996).

DOI: 10.1002/pssb.2221950113

[10] A.M. Korsunsky, On the modelling of residual stresses due to surface peening using eigenstrain distributions, J. Strain Analysis Vol. 40 No. 8, (2005), 817-824.

DOI: 10.1243/030932405x30984

[11] M. François, Relation entre contraintes résiduelles et déformations inélastiques, application à une éprouvette Almen, Internal report, University of Technology of Troyes (2005).

[12] T. Ericsson, Principles of heat treating of steels, ASM Handbook, Vol 4, Heat treating, edited by J. Davis, G. Davidson, S. Lampman, T. Zorc, J. Daquila, A. Ronke, K. Henniger, ASM international (1991).

[13] T. Hirsch, H, Wohlfahrt, E. Macherauch, Fatigue strength of case hardened and shot peened gears, 3rd International conference on shot peening, ICSP3, (1987), 547-560.

[14] H. Wohlfahrt, The influence of peening conditions on the resulting distribution of residual stress, 2nd International conference on shot peening, ICSP2, (1984).