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Mechanical Characterization of Carbonitrided Steels with Spherical Indentation

Abstract : Carbonitrided steels are widely used in industry because of their relatively low cost and high performance. The hardness of these materials is very high on the surface and decreases with depth due to micro-structural and chemical compositional changes. In order to predict the behaviour of carbonitrided steels, the knowledge of the plastic properties of the surface, the substrate and the intermediate layers is necessary. It is not possible to obtain those properties with the standard tensile test. Therefore, a local mechanical identification test is necessary to characterize the mechanical properties of carbonitrided steels The instrumented indentation technique can be applied on a carbonitrided steel as a local identification method. In this work a method for the characterization of carbonitrided steels with spherical indentation and inverse analysis is proposed. This method is based on the assumption of the linear variation of plastic properties between surface and substrate. Local identification of each layer independently of the others, using indentation test, shows that this assumption is correct. The proposed method consists, in a first step, to identify the plastic properties of the substrate, then, in a second step, those of the surface According to the assumption of linear variation of plastic properties, the plastic properties of the intermediate layers are estimated. A validation method shows that the results are satisfying.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-00994656
Contributor : Olivier Bartier <>
Submitted on : Wednesday, May 21, 2014 - 6:42:45 PM
Last modification on : Monday, January 20, 2020 - 2:44:02 PM

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  • HAL Id : hal-00994656, version 1

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Olivier Bartier, Charbel Moussa, Gerard Mauvoisin, Xavier Hernot, Guillaume Delattre. Mechanical Characterization of Carbonitrided Steels with Spherical Indentation. 10th International Conference of Local Mechanical Properties, Nov 2013, Kutna Hora, Czech Republic. ⟨hal-00994656⟩

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