Communication Dans Un Congrès Année : 2025

FQ-02. Innovative assessment of carburized steel hardness profiles using low-frequency magnetic incremental permeability

Résumé

LF-MIP is an innovative, non-destructive evaluation technique used to assess carburization treatments on steel components. Carburization is essential for enhancing surface hardness and resistance, but improper treatment can lead to mechanical failures. Traditional evaluation methods are often destructive and costly [1]. LF-MIP uses the relationship between a material's magnetization properties and its mechanical characteristics. It involves slowly magnetizing the sample while applying Eddy Current Testing at low frequencies [2]. The technique is efficient at deep carburization due to its deep penetration capability, which allows it to assess layers that are not reachable by other methods. In previous work, we described a simulation method combining the Dodd & Deeds analytical expression with the Jiles-Atherton theory to simulate the relation between the carburization treatment case depth and LF-MIP measurements [3-5]. In this new work, we went beyond. We used a 3D Finite Element Model (3D-FEM) to simulate all LF-MIP experimental situations, providing precise 3D magnetic field distributions and scanned depths up to the whole carburization treatment trajectory. We used 16NiCrMo13 martensitic stainless steel specimens that were categorized based on varying degrees of carburizing treatment time. The hardness profiles of these specimens were measured and compared with simulations based on an analytical expression inspired by Fick's laws of diffusion [6, 7]. A series of pre-calculated hardness profiles were then plotted, and the physical properties' profiles, such as conductivity and permeability, were computed, assuming they followed similar trajectories. Comsol simulations were performed with a coil above a conductive material divided layers of adjustable thickness and properties. The results were used to create an impedance distribution chart that could estimate unknown hardness profiles based on LF-MIP characterization. The method's predictions were validated by comparing them with experimental measurements, achieving an error of less than 6% for various treated specimens (see Fig. 1).

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hal-04912296 , version 1 (27-01-2025)

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  • HAL Id : hal-04912296 , version 1

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Hicham Lberni, Benjamin Ducharne, Hélène Petitpré, Jean-François Mogniotte, Yves Armand Tene Deffo, et al.. FQ-02. Innovative assessment of carburized steel hardness profiles using low-frequency magnetic incremental permeability. The 16th Joint Conference on Magnetism and Magnetic Materials and Intermag - INTERMAG2025, Jan 2025, New Orleans (LA), United States. ⟨hal-04912296⟩
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