首页|Surface degradation of nitrided hot work tool steels under repeated impact-sliding contacts: Effect of compound layer
Surface degradation of nitrided hot work tool steels under repeated impact-sliding contacts: Effect of compound layer
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NSTL
Elsevier
Wear behaviour of quenched and tempered (QT) hot work tool steels (Uddeholm QRO90) was investigated against SAE 52100 grade bearing steel balls after gas nitriding using a dedicated laboratory scale impact-sliding wear test rig. Gas nitriding was employed in a fluidised bed reactor under two alternative regimes: i. "High Temperature Nitriding (HTN)" carried out at 510℃ and ii. "Low Temperature Nitriding (LTN)" carried out at ≤ 400℃. The HTN process resulted in the formation of ～2 μm thick external compound layer, whereas the LTN processed steels were free of any surface compound layer formation. After the impact-sliding wear tests employed at room temperature (RT), the prevailing wear mechanisms of the examined steels were assessed as tribo-oxidation and fatigue wear. The testing at 600℃ induced different wear mechanisms for the HTN and the LTN steels. While tribo-oxidation and fatigue wear were preserved for the HTN steel, plastic deformation dominated the wear that progressed on the compound layer free surface of the LTN steel. Impact-sliding wear testing at 600℃ showed that the wear rate of LTN > HTN steels, as opposed to the wear rate at RT where wear rate of HTN > LTN.
NitridingCompound layerHot work tool steelWear mechanismImpact-sliding wear
M. Kaba、M. Altay、E. Akyildiz、F. Muhaffel、S. Ozkurt、E. Atar、M. Baydogan、H. Cimenoglu
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Department of Metallurgy and Materials Engineering, Istanbul Technical University
Supsan Motor Supaplari San. Tic. A. S
Department of Materials Science and Engineering, Gebze Technical University
NSTL
Elsevier
