A5065386887- Microstructure and Mechanical Properties of Steels
- Intermetallics and Advanced Alloy Properties
- Metal and Thin Film Mechanics
- Shape Memory Alloy Transformations
- High Entropy Alloys Studies
- Titanium Alloys Microstructure and Properties
- Metal Alloys Wear and Properties
- Metallurgical and Alloy Processes
- Advanced materials and composites
- Metallurgy and Material Forming
- Additive Manufacturing Materials and Processes
- Advanced Machining and Optimization Techniques
- Metallurgical Processes and Thermodynamics
- Microstructure and mechanical properties
- Advanced Battery Technologies Research
- High voltage insulation and dielectric phenomena
- Semiconductor materials and interfaces
- Inorganic Chemistry and Materials
- Welding Techniques and Residual Stresses
- Aluminum Alloy Microstructure Properties
- High-Temperature Coating Behaviors
- Chemistry and Chemical Engineering
- Engineering and Environmental Studies
CentraleSupélec
2024
Université Paris-Saclay
2024
Centre National de la Recherche Scientifique
2024
Military Institute of Engineering
2017-2024
Laboratoire de Mécanique Paris-Saclay
2024
Universidade de São Paulo
2021-2022
Universidade Brasil
2022
The automotive industry has experienced rapid growth, with lightweight materials becoming a significant research focus. Among these materials, low-density Fe-Mn-Al-C alloys show promise for this kind of application. To optimize the hot workability parameters practical applications, it is essential to explore deformation behavior alloys. In study, we investigated alloy Fe-0.77Mn-7.10Al-0.45C-0.31Nb using plane-strain compression tests several temperatures (850, 950, 1050, and 1150 °C) nominal...
The present study shows a comparison between two sintering processes, microwave and conventional sintering, for the manufacture of NiTi porous specimens starting from powder mixtures nickel titanium hydrogenation-dehydrogenation (HDH) milled by mechanical alloying short time (25 min). samples were sintered at 850 °C 15 min 120 min, respectively. Both exhibited porosity, pore size results are within range human bone. intermetallic compound (B2, R-phase, B19') was detected in both through...
Reducing pollutant emissions and improving safety standards are primary targets for modern mobility improvement. To meet these needs, the development of low-density steels containing aluminum is a new frontier research automotive applications. Low-density Fe-Mn-Al-C alloys promising. In this regard, an alloy with high content niobium addition belonging to system was evaluated understand possible phase transformations thus obtain transformation diagram by continuous cooling help future...
The structural and thermophysical characteristics of an Ni-rich NiTi alloy rod produced on a laboratory scale was studied. soak temperature the solution heat-treatment steps above 850 °C taking advantage precipitate dissolution to provide matrix homogenization, but it takes many hours (24 48) when used without thermomechanical steps. Therefore, suitable reheating apply between forging process is very important, because product’s are dependent processing history, time required expose material...
Additive manufacturing (AM) plays a crucial role in the development of NiTi alloys, enabling creation complex and customized structures while optimizing properties for various biomedical industrial applications. The aim this paper was to investigate influence laser scanning speed on laser-assisted reactive sintering mixture No Ti powders. samples were sintered at two different beam speeds, 4 5 mm/s their morphological microstructural characteristics investigated. Scanning electron microscopy...
Mechanical alloying (MA) is widely applied in the synthesis of blended elemental or prealloyed powders. This work evaluates effect milling time on nickel and titanium powders produced by oxi‐reduction hydrogenation–dehydrogenation process, respectively. The are characterized scanning electron microscopy, X‐ray diffraction, particle size, powder yield, differential calorimetry. It observed that increasing promotes formation a structure composed thin lamellae titanium, which results beneficial...
Over the last decades, alloy 718 usage has expanded and requirements imposed by its industrial applications became more critical. The knowledge about grain boundary character distribution (GBCD) in effect on properties improvement is mostly built based iterative processing through cold rolling steps interspersed with solution annealing. Alloy found industry many different forms geometries, fabricated multiple thermomechanical processes such as wire drawing, rolling, forging or extrusion....
The present study aims to assess the superelasticity behavior in Ni-rich NiTi alloy wire produced by rotary forging process. thermomechanical process involved four steps of hot working at 800ºC, two cold with solution heat treatment 800ºC between them, and subsequently a (950ºC during 2 hours) followed aging 350, 400 450 ºC 30 minutes. X-ray diffraction (XRD) instrumented ultra-micro hardness testers evaluated phase each aged sample were compared their mechanical behavior. results put...
RESUMO Nos últimos anos, vários estudos foram realizados buscando reduzir o peso de veículos automotores, a fim diminuir as emissões poluentes. Neste cenário os aços baixa densidade do sistema Fe-Mn-Al-C podem ser considerados uma alternativa promissora para suprir essas exigências da indústria automotiva. Geralmente, nos densidade, quantidade considerável alumínio é adicionada geral aço. No entanto, altos teores promovem características distintas na microestrutura, destes quando comparados...
PDF | O processo de manufatura aditiva (AM) é uma técnica que possibilita a produção integrada dispositivos, sendo aplicável em diversas áreas da indústria. Além disso, peças e componentes ligas NiTi com memória forma nesse apresenta opções processamento atraentes, desafiando as rotas convencionais fabricação, particularmente no diz respeito ao método Deposição por Energia Direcionada (DED). Contudo, características físicas químicas do pó empregado como matéria-prima exercem um impacto...
Mechanical alloying (MA) is widely applied in synthesizing blended elemental or preallloyed powders. In this work was evaluated the short time of high-energy milling synthesis nickel and titanium The characterization MA-powders processed reached by scanning electron microscopy, X-ray diffraction, particle size, powder yield, differential calorimetry. It shown that increasing promoted a formation lamellar structure, reduction temperature for intermetallic Ni-Ti system, yield achieved.
Com o objetivo de avaliar as condições estruturais via comportamento mecânico associada ao efeito TRIP realizou-se estudo comparativo das propriedades mecânicas dois aços inoxidáveis austeníticos comerciais graus 304L e 201LN.A martensita induzida por deformação foi formada durante a laminação frio temperatura ambiente até percentual redução espessura 80% avaliada nanoindentação com cargas máximas ensaio 1, 20, 50 100 gf.Observou-se que decresceram
As ligas de NiTi ricas em Ni tendem a exibir o efeito superelástico temperatura ambiente.As amostras estudo foram submetidas tratamento térmico e mecânico fim avaliar comportamento destas.Foram realizados ensaios ambiente difração Raios-X (DRX) para identificar as fases presentes avaliaram-se propriedades mecânicas via ultramicrodureza instrumentada com pré-ciclagem térmica (aquecimento resfriamento).Os resultados exibiram bons indicativos quanto ao uso prévio desta ferramenta análises do...
Avaliou-se o comportamento mecânico do aço inoxidável austenÃtico 304L submetido à transformação martensÃtica induzida por deformação plástica com percentuais distintos durante a laminação frio temperatura ambiente e após tratamento térmico de recozimento, para reversão da martensita em austenita, duas condições: 800 °C 750 1 min. As propriedades mecânicas foram mensuradas via nanoindentação instrumentada cargas máximas ensaio 20 gf evolução microestrutural, quanto...