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Étude de l'influence d'un traitement DUPLEX sur les propriétés tribologiques d'un acier AISI 316LM

Abstract : Within the frame of improving the dry sliding properties of steels, nitriding treatments were conducted on linear strip-like patterns etched in AISI 316LM samples in two configurations: W100-D100 and W100- D300, W being the width of asperity and D the distance between them, in micrometers. Such patterns were obtained by ion etching in a MDECR plasma reactor through masks. The same device was used for the low-temperature nitriding treatment (400 C), which results in expanded austenite layers. Tribological tests were performed by ball-on plane dry reciprocal sliding tests carried out with an alumina ball under a load of 5 N. First of all, the durability of non-nitrided AISI 316 LM patterned samples is shown to be very low. The texture is completely destroyed after a few hundred cycles. We found a strong reduction of wear for all the nitrided textured samples. A different repartition of the wear debris along the tracks between both patterned configurations was revealed. Wear debris are found within the valleys of W100-D100 configuration, whereas negligible quantities of debris are observed in the valleys of W100-D300 configuration. In addition, debris accumulations occur at the tips of the wear tracks. Such accumulation is higher for the W100-D300 configuration. After nitriding, the average µ is found to be dependent on the configurations of the patterns. A duplex treatment increases the average µ for the W100D300 samples and reduces it for the W100-D100 ones. These observations are linked to the wear mechanisms appearing to be different for the two patterns configurations: abrasive mode for the W100-D100, combination of abrasive, adhesive, fatigue and oxidation modes for the W100-D300. Hertz pressure based model demonstrates high contact pressures for both patterned configurations (for the W100-D300 configuration to be from 21 to 2.2 GPa). Furthermore, energetic model shows that the mechanical energy produced during the interaction of the ball against the asperity edges is higher on W100-D300 than for W100-D100 configuration. Finally, this study demonstrates that the durability of patterned surfaces can be widely improved by a nitriding treatment. Our results also open new perspectives to tailor friction properties by an appropriate patterns geometry.
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Submitted on : Tuesday, November 10, 2020 - 4:28:20 PM
Last modification on : Wednesday, November 11, 2020 - 3:33:20 AM


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Anastasiia Pavlik. Étude de l'influence d'un traitement DUPLEX sur les propriétés tribologiques d'un acier AISI 316LM. Mécanique des matériaux [physics.class-ph]. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0111⟩. ⟨tel-02998786⟩



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