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Article Dans Une Revue Journal of Materials Engineering and Performance Année : 2024

316L Stainless-Steel Carburizing Close to Eutectic Transformation Using the Spark Plasma Sintering Process

Résumé

This work focuses on the 316L austenitic stainless-steel case-hardening microstructure, after the SPS process near the solid/liquid state transition temperature. This process, faster than conventional carburizing techniques, is equivalent to weld cladding, allowing the achievement of high surface carbon contents with large-size carbide grains in the case of partial melting. Three distinct zones were formed: internal carburizing, carburizing with melting, and carburizing with melting and chromium depletion; all three composed of mixed carbides (Cr$_{0.4}$Fe$_{0.6}$)$_7$C$_3$ distributed in an austenitic matrix. The internal carburizing layer growths following a parabolic kinetic law with k$_p^{(i)}$ ≈ 10$^{-7}$ cm$^2$/s, while the advancement of the melting front is very fast and follows a linear law with k$_l$ = 1.0 x 10$^{-4}$ cm$^2$/s at 1100 °C. The Cr-depleted fusion zone microstructure is similar to a composite material with a metallic matrix, which includes graphite particles, Mo-rich intermetallic phases, and core-shell eutectic carbides. The partial melting zone without Cr depletion shows the formation of a dense carbide layer with diameters exceeding 10 µm, constituting 60% of the volume, and achieving a hardness of 850 HV$_5$. Its wear rate is about 100 times lower than the 316L steel, indicating a significant improvement in the alloy's wear behavior.
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jeudi 26 septembre 2024
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jeudi 26 septembre 2024
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Dates et versions

hal-04639462 , version 1 (09-07-2024)

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Citer

Yoann Pinot, Aurélien Besnard, Maria-Rosa Ardigo-Besnard, Florian Bussière. 316L Stainless-Steel Carburizing Close to Eutectic Transformation Using the Spark Plasma Sintering Process. Journal of Materials Engineering and Performance, In press, ⟨10.1007/s11665-024-09386-7⟩. ⟨hal-04639462⟩
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