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3 results on '"K. Tabalaiev"'

1. Characterization of 100Cr6 lattice structures produced by robocasting

Author

Erik Camposilvan, Didier Chicot, Laurent Gremillard, M. Yetna N’Jock, Eric Maire, J Adrien, Damien Fabrègue, K Tabalaiev, Laboratoire de Mécanique de Lille - FRE 3723 (LML), Université de Lille, Sciences et Technologies-Centrale Lille-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Groupe de physique des matériaux (GPM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Université de Lille, Sciences et Technologies-Ecole Centrale de Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Génie Civil et Géo-Environnement (LGCgE) - ULR 4515 (LGCgE), Université d'Artois (UA)-Université de Lille-Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)

Subjects
Fabrication, Materials science, Additive manufacturing, Characterization, Sintering, Young's modulus, 02 engineering and technology, Crystal structure, 01 natural sciences, Rod, Robocasting, [SPI.MAT]Engineering Sciences [physics]/Materials, symbols.namesake, [SPI]Engineering Sciences [physics], 0103 physical sciences, lcsh:TA401-492, General Materials Science, Composite material, Porosity, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Mechanical Engineering, Nanoindentation, 021001 nanoscience & nanotechnology, Microstructure, Mechanics of Materials, Metallurgy, symbols, lcsh:Materials of engineering and construction. Mechanics of materials, 0210 nano-technology
Abstract

Lattice structures of 100Cr6 steel were manufactured from metallic-based inks by robotic-assisted deposition (robocasting) using Pluronic F-127 solution. The stability and pseudo-plastic behavior of the ink were optimized, and allowed printing through 200–840 μm nozzles, leading to macroporous architectures composed of 300–600 μm diameter rods separated by 90–350 μm pores, after debinding and sintering. A second level of porosity (sub-micron size) was controlled by adjusting the sintering temperature. The linear shrinkage due to drying and thermal consolidation was evaluated from images obtained by micro-tomography and volumes measured by mercury intrusion porosimetry. Whatever the thermal treatments, the microstructure was always mainly composed of ferrite – α. The mechanical properties were estimated both at a local level (Young modulus and hardness of the rods by nanoindentation, coherent with those of 100Cr6 steel) and at the architecture level (stress-strain curve of the structures, showing a plastic behavior related to a good consolidation of the structure). Thus, dense metallic lattice structures with a regular macroporosity and interesting mechanical properties can be easily obtained with these water-based metallic inks, which do not require a complex formulation nor high organic content as reported in literature. Keywords: Additive manufacturing, Robocasting, Mercury intrusion porosimetry, X-ray micro-tomography, Microstructural characterization, Mechanical properties

Published
2017

2. Influence of the microstructure on the corrosion behaviour of low-carbon martensitic stainless steel after tempering treatment

Author

Frédéric Herbst, S. Thiébaut, Sylvain Ringeval, Vincent Vignal, K. Tabalaiev, Rémi Chassagnon, C. Dessolin, and Olivier Heintz

Subjects
Materials science, Scanning electron microscope, General Chemical Engineering, Metallurgy, Polishing, General Chemistry, Martensitic stainless steel, engineering.material, Microstructure, Corrosion, engineering, Pitting corrosion, General Materials Science, Tempering, Electron backscatter diffraction
Abstract

The microstructure of grade X4CrNiMo16.5.1 stainless steel was studied at different scales. The chemical composition of the native passive film formed on the different phases was then determined at the microscale. The degree of homogeneity of the native passive film is discussed. Subsequently, the susceptibility to pitting corrosion of X4CrNiMo16.5.1 was quantified using the electrochemical microcell technique. The nature of precursor sites and the morphology of pits were investigated by combining scanning electron microscopy with Electron BackScatter Diffraction and potentiostatic pulse tests. The role of the microstructure and the cold-worked layer generated by polishing in pitting is discussed.

Published
2014

3. Influence of Spark Plasma Sintering Conditions on the Sintering and Functional Properties of an Ultra-Fine Grained 316L Stainless Steel Obtained from Ball-Milled Powder

Author

Gaël Marnier, Jacques G. Noudem, K. Tabalaiev, Clément Keller, Eric Hug, Xavier Sauvage, Groupe de physique des matériaux (GPM), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)-Institut de Chimie du CNRS (INC)

Subjects
Materials science, Sintering, Spark plasma sintering, 02 engineering and technology, engineering.material, 01 natural sciences, Stainless steel, Powder metallurgy, 0103 physical sciences, General Materials Science, Austenitic stainless steel, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Plasma sintering, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, Functional properties, Mechanical Engineering, Metallurgy, Ultra-fine grain, Intergranular corrosion, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Microstructure, Grain size, Mechanics of Materials, engineering, Crystallite, 0210 nano-technology
Abstract

International audience; In this work, 316L samples with submicrometric grain size were sintered by spark plasma sintering. To this aim, 316L powder was first ball-milled with different conditions to obtain nanostructured powder. The process control agent quantity and milling time were varied to check their influence on the crystallite size of milled powder. Samples were then sintered by spark plasma sintering using different sets of sintering parameters (temperature, dwell time and pressure). For each sample, grain size and density were systematically measured in order to investigate the influence of the sintering process on these two key microstructure parameters. Results show that suitable ball-milling and subsequent sintering can be employed to obtain austenitic stainless steel samples with grain sizes in the nanometer range with porosity lower than 3%. However, ball-milling and subsequent sintering enhance chromium carbides formation at the sample surface in addition to intragranular and intergranular oxides in the sample as revealed by X-ray diffraction and transmission electron microscopy. It has been shown that using Boron nitride together with graphite foils to protect the mold from powder welding prevent such carbide formation. For mechanical properties, results show that the grain size refinement strongly increases the hardness of the samples without deviation from Hall-Petch relationship despite the oxides formation. For corrosion resistance, grain sizes lower than a few micrometers involve a strong decrease in the pitting potential and a strong increase in passivation current. As a consequence, spark plasma sintering can be considered as a promising tool for ultra-fine grained austenitic stainless steel.

Published
2016

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