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Proceedings Paper

Effect of retained austenite on high cycle fatigue behaviour of carburized 14NiCr11 steel
Author(s): D. Jeddi; H. Sidhom; H.-P. Lieurade
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Paper Abstract

Two vacuum carburizing treatments were applied to ductile steel 14NiCr11 to obtain equivalent hardened layers with retained austenite contents of 25% and 41%. The properties of the carburized surfaces were examined and characterized before fatigue tests and during cyclic loading. Transformation of retained austenite into martensite during loading, was evaluated by dispersive X-ray diffraction method. The effects of this transformation on the residual stresses have been measured by X ray diffraction in martensite and in retained austenite structures. It was shown that the cyclic retained austenite transformation caused a redistribution of the compressive residual stresses and an increased surface hardness that stabilized after a small number of cycles. The dependence of fatigue behaviour on surface properties was determined, and a relationship between the stabilized state and the fatigue limit is suggested. A phenomenological approach is proposed to correlate the influence of surface hardening and the stabilized residual stresses on fatigue limit of carburized specimens. The Crossland, Dang Van and Findley-Matake, multiaxial high cycle fatigue criteria were used in this approach and results have shown a good agreement with experimental data.

Paper Details

Date Published: 24 August 2009
PDF: 6 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73751J (24 August 2009); doi: 10.1117/12.839063
Show Author Affiliations
D. Jeddi, Institut Préparatoire aux Etudes d'Ingénieurs d'ElManar (Tunisia)
H. Sidhom, Ecole Supérieure des Sciences et Techniques de Tunis (Tunisia)
H.-P. Lieurade, Ctr. Technique des Industries Mécaniques (France)

Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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