Microstructure and performance of functionally graded Ti(C,N)-based cermets prepared by double-glow plasma carburization |
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| Affiliation: | 1. Department of Materials Engineering, Faculty of Engineering, Malayer University, Malayer 65719-95863, Iran;2. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran 16846-13114, Iran;1. TU Bergakademie Freiberg, Institute of Materials Engineering, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany;2. TU Bergakademie Freiberg, Institute of Materials Science, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany;1. Laboratoire des matériaux utiles, Institut National de Recherche et d’Analyse Physico-chimique, Pôle technologique de Sidi Thabet, 2020 Sidi Thabet, Tunisia;2. Ecole Supérieure des Ingénieurs de l’Equipement Rural, Medjez El Bab, 9070, Tunisia;3. Laboratoire des Sciences des Procédés et des Matériaux, CNRS-UPR 9001, Université Paris 13, 93430 Villetaneuse, France;1. School of Materials Science and Engineering, Xi''an University of Technology, Xi''an 710048, China;2. School of Materials Science and Engineering, Xi''an University of Science and Technology, Xi''an 710054, China;3. Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji 721016, China;4. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi''an 710049, China;1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01 Ko?ice, Slovak Republic;2. Faculty of Metallurgy, Technical University of Ko?ice, Letná 9, 040 01 Ko?ice, Slovak Republic;3. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava 45, Slovak Republic |
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| Abstract: | Ti(C,N)-based cermets were subject to double-glow plasma carburization which substantially improved the surface hardness. The microstructures were studied using scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDX). It was found that the double-glow plasma carburization introduced a graded surface zone enriched in carbonitride phase and deficient in binder phase. The microstructure of the surface zone of the carburized cermet was different from that of the as-sintered cermets. Besides the carbonitride grains with typical core–rim structure, the amount of smaller grains without obvious rim phase increased greatly, and some carbonitride grains adjoined and congregated with each other. The formation of the graded layer was due to the high carbon activity in the surface region during carburization, which caused the titanium, molybdenum and tungsten to transport outwards and forced the nickel to transfer inwards. After double-glow plasma carburization, the surface hardness was increased greatly and the hardness distribution along the depth was in accord with the binder distribution. |
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