Готові списки джерел за темами / Medium manganèse

Добірка наукової літератури з теми "Medium manganèse"

Автор: Grafiati
Опубліковано: 8 червня 2024

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Статті в журналах з теми "Medium manganèse":

1

Новохацкая, А. А., та Г. Я. Акимов. "Роль избыточного марганца в формировании структуры и транспортных свойств манганита (Nd-=SUB=-0.67-=/SUB=-Sr-=SUB=-0.33-=/SUB=-)-=SUB=-1-x-=/SUB=-Mn-=SUB=-1+x-=/SUB=-О-=SUB=-3-=/SUB=- (x=0; 0.2), спеченного при 1273-1473 K". Физика твердого тела 60, № 7 (2018): 1378. http://dx.doi.org/10.21883/ftt.2018.07.46127.009.

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AbstractThe Nd_0.67Sr_0.33MnO_3 manganite is a material promising for application as a cathode for medium-temperature solid oxide fuel elements. A high electrical conductivity of such a cathode is the parameter determining the efficiency of the operation of a fuel element. In this report, the effect of influence of excess manganese on the structure and the conductivity of manganite ceramics with compositions (Nd_0.67Sr_0.33)_1– x Mn_1 + x O_3± Δ ( x = 0, 0.2) sintered at temperatures 1273–1673 K is presented for the first time. The existence of 20% excess manganese in the initial manganite powder after sintering is shown to lead to that the conductivity of the obtained ceramics in the temperature range 823–1073 K is several times higher than the conductivity of the ceramics without excess manganese.
2

Francisco Sánchez Viesca and Reina Gómez Gómez. "A complete and sustained organic/inorganic reaction mechanism of Baeyer’s test." World Journal of Chemical and Pharmaceutical Sciences 4, no. 2 (May 30, 2024): 001–5. http://dx.doi.org/10.53346/wjcps.2024.4.2.0023.

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The Baeyer’s test for unsaturation has been used in Qualitative Organic Analysis for a long time. However, if an alkaline reagent is used, compounds having an active hydrogen (carbon acids) also give a positive test with potassium permanganate, detracting the test for unsaturation. The first steps of the reaction sequence have been described but the next stages are missing. These are very important because they involve the formation mode of the observed end product, brown manganese dioxide. In this communication, a complete and sustained reaction mechanism is provided for both reaction mediums, neutral and alkaline. It is in accordance with observed experimental facts. The missing steps are a redox reaction between hypomanganate and permanganate ions, and a second cyclic intermediate now formed with manganate ion. The instability of this intermediate leads directly to manganese dioxide and alkalinization of the neutral medium, as observed experimentally.
3

Wang Yanjie, 王艳杰, 赵琳 Zhao Lin, 彭云 Peng Yun та 曹洋 Cao Yang. "中锰汽车钢激光焊接焊缝组织与韧性". Chinese Journal of Lasers 49, № 8 (2022): 0802021. http://dx.doi.org/10.3788/cjl202249.0802021.

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4

De Moor, Emmanuel, Alexandra Glover, Josh Mueller, John G. Speer, and David K. Matlock. "Double Soaking of Medium Manganese Steels." Materials Science Forum 1105 (November 29, 2023): 207–12. http://dx.doi.org/10.4028/p-wh9qva.

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Double soaking (DS) has been proposed as an alternate processing route for medium manganese steels. DS consists of soaking in the intercritical annealing region to stimulate manganese enrichment of austenite by depletion of ferrite followed by secondary soaking at a higher temperature and cooling to room temperature to obtain a martensite/austenite microstructure. DS is different from more traditional medium manganese heat treating which usually involves a single soaking step in the intercritical region to generate a ferrite/austenite microstructure. DS has been shown effective at generating attractive tensile properties notably tensile strength levels in excess of typically observed levels in medium manganese steels. A review of properties and microstructural evolution obtained by DS of medium manganese steels is presented here.
5

Chakraborty, D., and T. K. Baidya. "Multi-Phase Manganese Mineralization in the Noamundi Synclinorium, East Indian Shield." Energy and Earth Science 3, no. 1 (May 7, 2020): p26. http://dx.doi.org/10.22158/ees.v3n1p26.

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Manganese mineralization associated with phyllites in and around Joda, Odisha belongs to the Iron Ore Group of Noamundi basin and is a part of Jamda-Koira belt of East Indian Shield. The present study area comprises low to medium grade tectonites containing economic resources of both iron and manganese. Present study is concentrated on Manganese mineralization. Field study and petro-mineralogical observations reveal syngenetic character of manganese ores comprising lowT higher oxides viz. pyrolusite, cryptomelane, manganite as major Mn-minerals along with highT lower oxides viz. jacobsite, bixbyite, braunite and hausmannite as minor Mn-minerals. The Mn-ore bodies and associated phyllites have undergone multiple phases of deformation and metamorphism followed by hydrothermal and supergene processes. Four deformational phases have been deciphered during field study. Geochemical analyses of ores and phyllitic host rocks show high values of Al2O3, TiO2, Ba, Co, Ni, Cr, Cu, Sc, V, As, Zn but depletion of Sr, Yb, Sm, Nb. Geochemical data infer ores to be a recycling product originally derived from a mafic crustal source of tholeiitic character. Age data obtained from Sm-Nd ratio of two rock samples are 3.46 Ga and 2.79 Ga. Present work provides a critical assessment on the multiphase mineralization of manganese ores.
6

Karoblis, Dovydas, Aleksej Zarkov, Tomas Murauskas, and Aivaras Kareiva. "Molten Salt Synthesis of Micro-Sized Hexagonally Shaped REMnO3 (RE = Y, Er, Tm, Yb)." Inorganics 11, no. 5 (April 23, 2023): 178. http://dx.doi.org/10.3390/inorganics11050178.

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Yttrium manganite (YMnO3) is a compound belonging to the hexagonal rare earth manganites family, which demonstrates multiferroic properties. This material can be prepared by several synthetic approaches, with the most common one being the solid-state synthesis. In this work, we show a possibility of preparing this material via molten salt synthesis using the NaCl-KCl mixture as the reaction medium and yttrium and manganese nitrates as the starting materials. We demonstrate that, by varying the reaction temperature and the nitrates-to-chlorides ratio, it is feasible to synthesize hexagonally shaped particles of microscopic dimensions. A similar synthesis procedure can be successfully applied for the preparation of other hexagonal manganites—ErMnO3, TmMnO3, and YbMnO3.
7

Ito, Atsushi, Akinobu Shibata, and Nobuhiro Tsuji. "Thermomechanical Processing of Medium Manganese Steels." Materials Science Forum 879 (November 2016): 90–94. http://dx.doi.org/10.4028/www.scientific.net/msf.879.90.

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As third generation advanced high strength steels (AHSS) managing both high strength and good ductility/formability, medium manganese steels containing 3-7 wt% Mn have attracted attentions recently. However, the fundamental microstructure evolution during thermomechanical processing and heat treatments in medium-Mn steels is still unclear. In the present study, changes in microstructure and mechanical properties during various heat treatments and thermomechanical processes of 4Mn-0.1%C steel were studied. It was clarified from dilatometric measurements that ferrite transformation in the 4Mn-0.1C steel was quite slow, so that fully martensitic structures were obtained in many cases after cooling from austenite. On the other hand, hot-deformation of austenite greatly accelerated ferrite transformation, and dual phase microstrcutures composed of ferrite and martensite could be obtained. The dual phase steel showed good combinations of high strength and adequate tensile ductility.
8

Rana, Radhakanta. "Special issue on ‘Medium manganese steels’." Materials Science and Technology 35, no. 17 (October 10, 2019): 2039–44. http://dx.doi.org/10.1080/02670836.2019.1673971.

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9

Lee, Y. K., and J. Han. "Current opinion in medium manganese steel." Materials Science and Technology 31, no. 7 (November 26, 2014): 843–56. http://dx.doi.org/10.1179/1743284714y.0000000722.

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10

Farkas, Bence, Marek Bujdoš, Filip Polák, Michaela Matulová, Martin Cesnek, Eva Duborská, Ondřej Zvěřina, et al. "Bioleaching of Manganese Oxides at Different Oxidation States by Filamentous Fungus Aspergillus niger." Journal of Fungi 7, no. 10 (September 28, 2021): 808. http://dx.doi.org/10.3390/jof7100808.

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This work aimed to examine the bioleaching of manganese oxides at various oxidation states (MnO, MnO·Mn2O3, Mn2O3 and MnO2) by a strain of the filamentous fungus Aspergillus niger, a frequent soil representative. Our results showed that the fungus effectively disintegrated the crystal structure of selected mineral manganese phases. Thereby, during a 31-day static incubation of oxides in the presence of fungus, manganese was bioextracted into the culture medium and, in some cases, transformed into a new biogenic mineral. The latter resulted from the precipitation of extracted manganese with biogenic oxalate. The Mn(II,III)-oxide was the most susceptible to fungal biodeterioration, and up to 26% of the manganese content in oxide was extracted by the fungus into the medium. The detected variabilities in biogenic oxalate and gluconate accumulation in the medium are also discussed regarding the fungal sensitivity to manganese. These suggest an alternative pathway of manganese oxides’ biodeterioration via a reductive dissolution. There, the oxalate metabolites are consumed as the reductive agents. Our results highlight the significance of fungal activity in manganese mobilization and transformation. The soil fungi should be considered an important geoactive agent that affects the stability of natural geochemical barriers.
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Статті в журналах

Дисертації з теми "Medium manganèse":

1

Lamari, Mathias. "In situ characterization and modelling of retained austenite thermomechanical stability in Medium Manganese Duplex TRIP-aided steels." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0114.

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Les aciers moyen manganèse appartiennent à la famille des aciers à très haute résistance mécanique (THR) de 3ème génération. Leurs propriétés exceptionnelles sont dues à leurs microstructures duplex particulières, qui contiennent une matrice "ferritique" de taille micrométrique et une quantité importante d'austénite résiduelle. Cette nouvelle génération d'aciers est considérée comme l'une des meilleures possibilités par les constructeurs automobiles pour continuer à améliorer la sécurité des véhicules légers tout en réduisant leur consommation d'énergie et donc leur empreinte environnementale. La bonne formabilité et la résistance élevée de ces aciers sont expliquées par la transformation martensitique induite par la déformation (SIMT) de l'austénite résiduelle pendant un chargement mécanique. La transformation progressive de l'austénite ductile en martensite dure provoque une augmentation rapide de l’écrouissage macroscopique de l'acier, mécanisme connu sous le nom d'effet de plasticité induite par la transformation (TRIP). La compréhension et la modélisation de la stabilité de l'austénite résiduelle et de la réponse mécanique associée de ces aciers sont donc d'un grand intérêt à la fois scientifique et industriel. Huit microstructures différentes ont été conçues sur la base de calculs thermodynamiques afin d'évaluer l'effet respectif de la morphologie, de la composition et de la taille des grains sur la stabilité de l'austénite. La formation des microstructures duplex lors du recuit intercritique a été caractérisée in situ par des expériences de diffractions des rayons X haute énergie (DRXHE) sur la ligne de lumière synchrotron. En plus de mesurer les cinétiques d'austénitisation en utilisant la méthode d’affinements Rietveld, ces expériences révèlent les mécanismes de précipitation/dissolution des carbures lors du chauffage et les grandes contraintes hydrostatiques résiduelles à l'échelle des phases obtenues après le refroidissement final. L'origine de ces contraintes hydrostatiques a été expliquée et quantifiée à travers un modèle. Un travail exhaustif de microscopie électronique à balayage (SEM) et de microsonde de Castaing a également été effectué pour mesurer les tailles et les compositions chimiques des différentes phases de la microstructure. Le comportement mécanique en traction des aciers étudiés a été mesuré en combinaison avec des expériences HEXRD et des mesures de corrélation d'images numériques (DIC). Ces expériences in situ uniques permettent de mesurer simultanément les cinétiques SIMT, la répartition des contraintes en 3D entre les phases (à savoir la ferrite, l'austénite et la martensite) en utilisant les méthodes des sin²ψ et les déformations locales le long des éprouvettes. Ceux-ci servent en particulier à caractériser les bandes de Lüders et de Portevin-Le Chatelier (PLC) qui affectent les aciers moyen Mn étudiés. Toutes ces données expérimentales ont servi à développer un modèle micromécanique à champ moyen innovant pour prédire le comportement en traction des aciers moyen Mn avec des microstructures austénite-ferrite-martensite. Il repose sur la description des comportements locaux de chaque phase et de la SIMT, tous deux étalonnés sur nos expériences HEXRD. Les écrouissages de l'austénite et de la ferrite sont modélisés grâce à un modèle sensible à la taille basées sur les densités de dislocations. Le comportement de la martensite fraîche et induite par la déformation est considéré, au contraire, comme une transition élastique/plastique étendue. Les cinétiques SIMT sont basées sur une évaluation thermodynamique de la stabilité de l'austénite résiduelle inspirée par le travail pionnier d'Olson et Cohen. Le modèle montre une excellente concordance avec les observations expérimentales
Medium manganese steels belong to the so-called 3rd generation of Advanced High Strength Steel (AHSS). Their ground-breaking properties are due to their particular duplex microstructures, which contain a micrometric “ferritic” matrix and a large amount of retained austenite. This new generation of steels is seen as one of the best possibilities for carmakers to continue improving the safety of light-duty vehicles and reduce their energy consumptions² and thus their environmental footprints. The good formability and the high resistance of those steels are explained by the strain-induced martensitic transformation (SIMT) of residual austenite during a mechanical loading. The gradual transformation of ductile austenite into high strength martensite causes a rapid increase in the macroscopic work-hardening of the steel, mechanism known as Transformation Induced Plasticity effect (TRIP). Understanding and modelling the stability of retained austenite and the related mechanical response of these steels are thus of great interest both from a scientific and industrial point of view.For this purpose, eight different microstructures have been designed based on thermodynamical calculations in order to evaluate the respective effect of the morphology, the composition and the grains size on austenite stability. The formation of the duplex microstructures during intercritical annealing have been characterized in situ by high-energy X-ray diffractions (HEXRD) experiments on synchrotron beamline. In addition to measuring austenitization kinetics using Rietveld refinements, these experiments reveal in an original way the mechanisms of primary precipitation/dissolution of carbides during heating and the large residual hydrostatic stresses at the scale of the phases obtained after final cooling. The origin of these latter has been explained and quantified through a model. An extensive scanning electron microscopy (SEM) and Castaing microprobe work was also conducted to measure the sizes and chemical compositions of the different microstructure components.The tensile mechanical behaviour of the studied steels has been measured in combination with HEXRD experiments and Digital Image Correlation (DIC) measurements. These unique in situ experiments permit to measure simultaneously the SIMT kinetics, the 3D stress partitioning between phases (namely ferrite, austenite and martensite) using sin²ψ methods and the local strains all along the tensile specimens. These latter serve in particular to characterize Lüders and Portevin-Le Chatelier (PLC) bands which affect the studied medium Mn steels.All those experimental inputs have served to develop an innovative mean field micromechanical framework to predict the tensile behaviour of medium Mn steels with austenite-ferrite-martensite microstructures. It relies on the description of the local behaviours of each constituting phase and of the SIMT of retained austenite, both calibrated on our HEXRD experiments. The work-hardening of austenite and ferrite are modelled thanks to a size-sensitive model based on dislocation densities. The behaviour of fresh and strain induced martensite is considered on the contrary as an extended elastic/plastic transition. The SIMT kinetics is based on a thermodynamical assessment of the stability of retained austenite inspired by Olson and Cohen pioneering work. The model is thus finally sensitive to the size of the microstructure components, to their local composition and to their respective stability and it shows an excellent agreement with the experimental observations
2

Dutta, Aniruddha [Verfasser], Dierk [Akademischer Betreuer] Raabe, and Sebastian [Akademischer Betreuer] Münstermann. "Deformation behaviour and texture memory effect of multiphase nano-laminate medium manganese steels / Aniruddha Dutta ; Dierk Raabe, Sebastian Münstermann." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1220082600/34.

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3

Arlazarov, Artem. "Évolution des microstructures et lien avec les propriétés mécaniques dans les aciers 'Médium Mn'." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0086/document.

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Lors d’un recuit inter-critique d’un acier dit « Medium Manganèse », dont la teneur en Mn est située entre 4 et 12 %, avec une microstructure initiale complètement martensitique, la formation de l’austénite obéit à un mécanisme spécifique qui porte le nom d'ART - « Austenite Reverted Transformation » (transformation inverse de l’austénite). L’objectif de ce travail de thèse était d’étudier et de modéliser les évolutions microstructurales en lien avec les propriétés mécaniques lors d’un recuit ART. Il a été déterminé que la microstructure finale se compose de phases de nature (ferrite, austénite résiduelle et martensite de trempe) et morphologie (en forme d’aiguille et polygonale) différentes. Une attention particulière a été accordée aux cinétiques de dissolution des carbures et de formation de l’austénite. Une vision complète de ces processus a été construite. En outre, le mécanisme de stabilisation de l’austénite résiduelle à la température ambiante a été étudié et discuté. Enfin, des essais de traction ont été réalisés afin d’évaluer le comportement mécanique de l’acier après différents recuits ART et établir le lien avec la microstructure. Une analyse plus détaillée du comportement de chaque constituant de la microstructure a été effectuée. A l'issue de cette thèse, un modèle complet est disponible pour calculer les courbes de contrainte vraie - déformation vraie d’un acier Medium Mn
During the intercritical annealing of fully martensitic Medium Mn steel, containing from 4 to 12 wt.% Mn, the formation of austenite happens through the so-called “Austenite Reverted Transformation” (ART) mechanism. In this PhD work, the evolution of both microstructure and tensile properties was studied as a function of holding time in the intercritical domain. The microstructure evolution was studied using a double experimental and modeling approach. The final microstructure contained phases of different natures (ferrite (annealed martensite), retained austenite and fresh martensite) and of different morphologies (lath-like and polygonal). A particular attention was paid to the kinetics of austenite formation in connection with cementite dissolution and to the morphology of the phases. A mechanism was proposed to describe the formation of such microstructure. The critical factors controlling thermal austenite stability, including both chemical and size effects, were determined and discussed, based on the analysis of the retained austenite time-evolution. At last, tensile properties of the steel were measured as a function of holding time and the relation between microstructure and mechanical behavior was analyzed. Advanced analysis of the individual behavior of the three major constituents was performed. As a final output of this work, a complete model for predicting the true-stress versus true-strain curves of medium Mn steels was proposed
4

Martinez, Juan David Santos. "Estudo comparativo da resistência à corrosão e permeabilidade do hidrogênio de aços API grau X65 baixo manganês em solução B da norma NACE TM-0284." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-15012018-145847/.

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Анотація:
Aços de alta resistência e baixa liga (ARBL) têm sido bastante utilizados na fabricação de tubulações para o transporte de petróleo e gás. Entretanto, o uso destes materiais em meios com elevadas concentrações de H2S, denominados sour, tem resultado em falhas frequentes, devido à suscetibilidade destes materiais ao desenvolvimento do fenômeno de trincamento induzido pelo hidrogênio (Hydrogen Induced Cracking - HIC), assim como devido a problemas de corrosão. O desenvolvimento de diferentes processos tecnológicos para a produção de tubos de aços ARBL, tais como a laminação controlada e resfriamento acelerado, a adição de microligantes, assim como a diminuição do teor de enxofre, fósforo, carbono e manganês, tem levado à elaboração de materiais com propriedades mecânicas otimizadas, permitindo também um melhor controle da microestrutura. As perdas de dureza e resistência mecânica devidas à redução do teor de manganês, são compensadas pela adição de elementos como cromo e nióbio. Neste trabalho estão sendo comparadas a resistência à corrosão e os parâmetros de permeabilidade do hidrogênio de dois tubos de aço API 5L X65 e uma chapa API 5L X65, todos do tipo ARBL e com baixo manganês (0,27%) e alto nióbio (0,083% a 0,090%), na solução B da norma NACE, TM-0284 (2011). Para isto, foram realizados ensaios de potencial de circuito aberto (Open Circuit Potential - OCP), espectroscopia de impedância eletroquímica (Electrochemical Impedance Spectroscopy - EIS) e curvas de polarização potenciodinâmicas no eletrólito naturalmente aerado, desaerado e saturado com H2S. Os testes de permeabilidade do hidrogênio foram realizados com base na norma ASTM INTERNATIONAL G148 - 97, porém usando a célula modificada de DEVANATHAN e STACHURSKY (1962) e com H2S como veneno catódico. Os materiais foram caracterizados por microscopia óptica (MO), microscopia eletrônica de varredura (MEV) e espectroscopia de energia dispersiva de Raios-X (X-Ray Energy Dispersive Spectroscopy - EDS) antes e depois de testes de imersão nos diferentes eletrólitos. Caracterização dos produtos de corrosão por difração de raios-X (DRX) também foi realizada após imersão em meio saturado com H2S (sour). As análises por MO e MEV mostraram matrizes ferríticas para os três aços, com a presença de baixos teores do microconstituinte martensita/austenita (M/A), de perlita e com baixo nível de inclusões uniformemente distribuídas e com composições químicas semelhantes. Os resultados dos ensaios de corrosão mostraram que, para todos os meios investigados, o aço denominado como B apresentou a melhor resistência à corrosão, enquanto aquele denominado como C se mostrou o mais suscetível em todas as condições estudadas. Para os três aços, a resistência à corrosão apresentou a seguinte ordem crescente de acordo com o meio de exposição: meio saturado com H2S < meio naturalmente aerado < meios desaerados. Ensaios de OCP e EIS no meio saturado com H2S em um período de 24h mostraram que a resistência à corrosão aumenta com o tempo em razão da formação de uma camada de sulfeto de ferro, que, no entanto, se apresentou pouco aderente. Os resultados dos ensaios de permeação de hidrogênio mostraram que o aço denominado B, que apresentou maior resistência à corrosão em todos os meios e que não apresenta perlita em sua microestrutura, teve o maior valor de difusividade efetiva de hidrogênio, menor concentração de hidrogênio atômico na sub-superfície e menor quantidade de traps por unidade de volume. Quanto aos outros dois materiais, os resultados dos testes de permeabilidade ficaram em desacordo com os resultados da caracterização microestrutural e dos testes de resistência à corrosão, indicando que fatores diferentes dos detectados neste estudo são importantes para governar essas propriedades.
High strength low alloy (HSLA) steels have been widely used in the manufacture of pipelines for the transport of oil and gas. However, the application of these steels in media with high H2S concentrations, denominated sour, has resulted in frequent failures due to the susceptibility of these materials to the development of Hydrogen Induced Cracking (HIC) phenomena, as well as due to corrosion problems. The development of different technological processes for HSLA piping production, like controlled rolling and accelerated cooling, the addition of microalloying elements, as well as the reduction of the amounts of sulphur, phosphorus, carbon and manganese, has led to the development of materials with optimized mechanical properties, also allowing a better microstructural control. Hardness and mechanical resistance reduction due to the lowering of Mn content are compensated by niobium and chromium addition. In this work, the corrosion resistance and the hydrogen permeability parameters of two API 5L X65 steel tubes and an API 5L X65 plate, all HSLA type and with low manganese (0.27%) and high niobium (0.083% to 0.090%) contents, are compared in solution B of NACE standard TM-0284 (2011). For this, open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves were carried out in the naturally aerated, deaerated and H2S saturated electrolyte. Hydrogen permeability tests were performed based on ASTM INTERNATIONAL G148-97, but using a modified DEVANATHAN and STACHURSKY (1962) cell and with H2S as cathodic poison. The materials were characterized by means of optical microscopy (OM), scanning electron microscopy (SEM) and X-Ray Energy Dispersive Spectroscopy (EDS) prior and after immersion tests in the different electrolytes. Characterization of the corrosion products by X-ray diffraction (XRD) was also performed after immersion in the H2S-saturated (sour) medium. The OM and SEM characterization showed ferritic matrices for the three steels, with the presence of low levels of the martensite/austenite (M/A) microconstituent, perlite and with a low level of inclusions evenly distributed and with similar chemical compositions. The results of the corrosion tests showed that, for all investigated media, the steel denominated as B presented the best resistance to corrosion, whereas the one denominated as C showed to be the most susceptible in all the conditions studied. For the three steels, the corrosion resistance showed the following ascending order according to the exposure medium: H2S saturated < naturally aerated medium < deaerated media. OCP and EIS tests in the H2S-saturated medium in a period of 24 hours showed that the corrosion resistance increases over time due to the formation of an iron sulphide layer, which, however, presented little adhesion. The results of the hydrogen permeation tests showed that the steel denominated B, that presented greater corrosion resistance in all media and that does not present perlite in its microstructure, had the highest values of effective hydrogen diffusivity, the lowest concentration of atomic hydrogen in the subsurface and the smallest amount of traps per unit volume. Concerning the other two materials, the results of the permeability tests were at variance with the results of the microstructural characterization and corrosion resistance tests, indicating that factors other than those detected in this study are important to govern such properties.
5

Sevsek, Simon [Verfasser], Wolfgang [Akademischer Betreuer] Bleck, and Dmitri A. [Akademischer Betreuer] Molodov. ""On the impact of micro- and nanostructural characteristics on the deformation behavior and mechanical properties of high- and medium-manganese steels" / Simon Sevsek ; Wolfgang Peter Bleck, Dmitri Molodov." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1195238010/34.

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6

Pérollier, Céline. "Synthèse de nouvelles métalloporhyrines chirales à substituants cyclopropaniques : applications en catalyse d'époxydation asymétrique et en reconnaissance moléculaire d'enantiomères." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10191.

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Анотація:
Le biocartol ou acide (1r)-cis-hemicaronaldehydique, un compose cyclopropanique enantiopur provenant de la synthese industrielle d'insecticides pyrethroides, est utilise comme synthon pour la preparation de nouvelles porphyrines chirales. Nous decrivons la synthese d'amides du biocartol, puis la synthese des porphyrines correspondantes par condensation avec le pyrrole. Celles-ci sont obtenues exclusivement sous la forme de l'atropoisomere , avec un rendement variant de 7 a 60%. Une serie de complexes de manganese (iii) de ces chiroporphyrines, derivees d'amides et d'esters du biocartol, ont ete prepares. Ces complexes sont de bons catalyseurs pour l'epoxydation asymetrique d'olefines prochirales. Les substrats a structure rigide cyclique sont epoxydes avec la plus grande selectivite. Ainsi, des exces enantiometriques allant jusqu'a 86% ont ete obtenus pour l'epoxydation du 1,2-dihydronaphtalene en (1s, 2r)-epoxy-1,2,3,4-tetrahydronaphtalene. L'influence de differents facteurs (nature des substituants, solvant, ligand axial, metal) sur la reactivite et l'enantioselectivite ont ete etudies. Des etudes structurales par resonance magnetique nucleaire et par diffraction des rayons x ont permis d'etablir une correlation entre structure et induction asymetrique dans cette serie. Nous avons mis en evidence que l'encombrement sterique au niveau du centre metallique lors de l'epoxydation est le determinant principal de l'enantioselectivite. Ces resultats sont interpretes par un modele geometrique de l'approche de l'olefine vers le centre metallique. La complexation d'amines derivees d'olefines prochirales par les chiroporphyrines de cobalt (iii) a egalement ete etudiee.
7

Yang, Shan-Chun, and 楊善淳. "Study on Microalloyed Medium-Manganese Steels in Quenching and Austenite Reversion Process." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/n9m429.

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Анотація:
碩士
國立臺灣大學
材料科學與工程學研究所
107
The current work investigates micro/nanostructure and mechanical behaviors of microalloyed medium-Manganese steels processed by quenching and austenite reversion (Q&AR). Precipitation behaviors of carbides due to complex additions of Ti, V, Nb, and Mo and their roles were compared and discussed in this work. It was found that formation of microalloyed carbide can contribute to materials’ strength in two ways. During austenization, coarser carbides enable significant grain refinement by the Zener pinning effect, leading to finer martensite laths and uniform distribution of reversed austenite in latter processes. During austenite reversion, precipitation of extremely fine carbides enables effective precipitation strengthening. All these benefits compensate the softening due to inter-critical annealing and increase materials yield strength. Moreover, with well-controlled temperature of austenite reversion, optimized ductility can be obtained when volume fraction of retained austenite is maximized. Based on established principles, a Nb-Mo-V-adding steel was designed for optimized mechanical properties: yield strength > 700 MPa, ultimate tensile strength > 1000 MPa, uniform elongation > 14 %, total elongation > 20 %. This thesis demonstrates the novel process and the combination of alloy design to create advanced high-strength steels with excellent properties.
8

Chiang, Meng-Hsuan, and 江孟軒. "Precipitation of microalloyed carbides in medium-manganese low-carbon steels subjected to high-temperature Q&P process." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2y2gvb.

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Анотація:
碩士
國立臺灣大學
材料科學與工程學研究所
105
In conventional quenching and partitioning (Q&P) processing, carbon partitions into retained austenite and stabilizes it during partitioning heat treatment at 300-500°C. The current research aimed at developing quenching and high temperature partitioning (Q&HTP) processing, in which manganese and carbon both partitioned into and stabilized retained austenite during high temperature partitioning heat treatment. To achieve this goal, new heat treatment processing and newly-designed alloys were developed. High temperature partitioning accompanied with austenite reversion was carried out at intercritical annealing temperature, producing fine austenite phase uniformly distributed in tempered martensite matrix. However, during intercritical annealing, martensite lath coalescence and dislocation annihilation would reduce the strength of Q&HTP steels. To compensate the softening effect, niobium and vanadium carbides were introduced into newly-designed alloy to enhance strength by grain refinement and precipitation strengthening. In present work, the increments of yield strength due to precipitation strengthening were about 100-200 MPa. Also, the effect of aluminum containing was investigated in this research. The optimum temperature of Al-free and Al-containing Q&HTP steels was 690 °C and 710 °C for 5 min heat treatment. However, the mechanical properties and microstructures of two steels were strongly related to the annealing temperature. The effect of precipitation strengthening in Al-containing steels were about 30-40 MPa higher than in Al-free steels.

Книги з теми "Medium manganèse":

1

Zhu, Xingwen. ZnO bao mo zhi bei ji qi guang, dian xing neng yan jiu. 8th ed. Shanghai Shi: Shanghai da xue chu ban she, 2010.

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Частини книг з теми "Medium manganèse":

1

Mei, Y. Q., J. S. Pei, B. Zhu, and Y. S. Zhang. "Nondestructive Testing of Medium Manganese Steel Based on Barkhausen." In Atlantis Highlights in Materials Science and Technology, 408–13. Dordrecht: Atlantis Press International BV, 2023. http://dx.doi.org/10.2991/978-94-6463-114-2_54.

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2

Okuda, K., T. Ishikawa, T. Omori, and R. Kainuma. "Texture Evolutions in Annealing Process for Medium Manganese Steel Sheets." In Proceedings of the 6th International Conference on Recrystallization and Grain Growth (ReX&GG 2016), 65–70. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48770-0_10.

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3

Okuda, K., K. Okuda, T. Ishikawa, T. Omori, and R. Kainuma. "Texture Evolutions in Annealing Process for Medium Manganese Steel Sheets." In Proceedings of the 6th International Conference on Recrystallization and Grain Growth (ReX&GG 2016), 63–70. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119328827.ch10.

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4

Cai, Zhihui, Hua Ding, Xin Xue, Qibin Xin, and Jun Jiang. "Microstructure Evolution and Mechanical Properties of Hot-Rolled Medium Manganese TRIP Steels." In TMS2013 Supplemental Proceedings, 909–15. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118663547.ch113.

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5

Guo, X. M., X. L. Zhang, J. Y. Mao, and Z. J. Wang. "Simulation Research on the Quenching and Partition Process of a Medium Manganese Steel." In Atlantis Highlights in Materials Science and Technology, 363–69. Dordrecht: Atlantis Press International BV, 2023. http://dx.doi.org/10.2991/978-94-6463-114-2_48.

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6

Wesselmecking, Sebastian, Marc Ackermann, Charline Blankart, Jing Wang, Frederike Brasche, Tobias Plum, Siyuan Qin, et al. "Toward Holistic Digital Material Description During Press-Hardening." In Internet of Production, 1–16. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-98062-7_22-1.

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AbstractPress hardening of manganese-boron steels is one of the most widely used production processes for high-strength automotive components. The low residual formability of these parts is a decisive disadvantage. The low formability originates from a strong, but brittle martensitic microstructure transformed during quenching in the press-hardening tool. In contrast, medium manganese steels (MMnS) contain high fractions of ductile retained austenite improving press-hardened parts toward promising candidates for crash-relevant car body components. Disadvantages include a more complex alloy design, a highly sensitive production process, and more demanding requirements on the tool due to higher strength during press-hardening.A detailed description of the entire production process along the process chain including the material and the press-hardening tool is important for tailoring the properties. Combined information is required to enable a precise control of the production process and its influences on the final properties of the part. Maximum economic use of the material is achieved by digitally describing MMnS as well as the tool along the entire process chain (casting, forging, hot rolling, cold rolling, galvanizing and press hardening including Q&P). To link the process steps and to describe the changes of the material, a new material database structure (idCarl) was developed. All production parameters are recorded and processed as a digital material twin. Ultimately, deviations occurring during production process can be deduced from in-line data analysis and counteracted. These can then be counteracted by adapted process control and the product can be brought back into the required parameter field of properties. Clear identification of the component and the used material allows conclusions about steps responsible for errors in the production process that become apparent during use.
7

Wesselmecking, Sebastian, Marc Ackermann, Charline Blankart, Jing Wang, Frederike Brasche, Tobias Plum, Siyuan Qin, et al. "Toward Holistic Digital Material Description During Press-Hardening." In Internet of Production, 171–86. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-44497-5_22.

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AbstractPress hardening of manganese-boron steels is one of the most widely used production processes for high-strength automotive components. The low residual formability of these parts is a decisive disadvantage. The low formability originates from a strong, but brittle martensitic microstructure transformed during quenching in the press-hardening tool. In contrast, medium manganese steels (MMnS) contain high fractions of ductile retained austenite improving press-hardened parts toward promising candidates for crash-relevant car body components. Disadvantages include a more complex alloy design, a highly sensitive production process, and more demanding requirements on the tool due to higher strength during press-hardening.A detailed description of the entire production process along the process chain including the material and the press-hardening tool is important for tailoring the properties. Combined information is required to enable a precise control of the production process and its influences on the final properties of the part. Maximum economic use of the material is achieved by digitally describing MMnS as well as the tool along the entire process chain (casting, forging, hot rolling, cold rolling, galvanizing and press hardening including Q&P). To link the process steps and to describe the changes of the material, a new material database structure (idCarl) was developed. All production parameters are recorded and processed as a digital material twin. Ultimately, deviations occurring during production process can be deduced from in-line data analysis and counteracted. These can then be counteracted by adapted process control and the product can be brought back into the required parameter field of properties. Clear identification of the component and the used material allows conclusions about steps responsible for errors in the production process that become apparent during use.
8

Liu, Yaohui, Sirong Yu, Zhenming He, and Qingchun Li. "Effect of Ce on Interfacial Wettability between A12O3 medium Manganese Steel and its Mechanism." In MICC 90, 496–501. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3676-1_85.

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9

Ran, J. M., X. Y. Hu, B. Zhu, and Y. S. Zhang. "Realistic Microstructural RVE-Based Simulations of Stress-Strain Behavior of a Medium-Manganese Steels." In Atlantis Highlights in Materials Science and Technology, 370–76. Dordrecht: Atlantis Press International BV, 2023. http://dx.doi.org/10.2991/978-94-6463-114-2_49.

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10

Zhang, Yu, and Hua Ding. "An Investigation on the Microstructure and Mechanical Properties of Hot Rolled Medium Manganese TRIP Steel." In Proceedings of the International Conference on Martensitic Transformations: Chicago, 67–71. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76968-4_11.

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Тези доповідей конференцій з теми "Medium manganèse":

1

Kalil, A., A. Carnahan, S. Stivala, and A. Druschitz. "Medium-Manganese FeMnSiAlC Advanced High-Strength Steels." In International Symposium on New Developments in Advanced High-Strength Sheet Steels. Association for Iron & Steel Technology, 2023. http://dx.doi.org/10.33313/298/021.

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2

Nizam, Khairul Hafiz Shahrul, and Nur Syahiza Zainuddin. "Removal of Iron and Manganese in Groundwater Using Alum and Potassium Permanganate." In International Conference on Nanoscience and Nanotechnology 2022. Switzerland: Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-r97jlb.

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Groundwater has become one of the natural sources of water nowadays. Naturally, groundwater contains dissolving materials such as soils, rocks, and minerals, which later release constituents, including iron (Fe2+) and manganese (Mn). However, raw groundwater has been found to consist of a high concentration of such minerals, which exceed the Groundwater Quality Standard published by the Department of Environment Malaysia. Initially, the concentration of Fe2+ and Mn exceeding the limit mentioned in the standard; 1.0 and 0.2 mg/L, respectively, might affect the quality of the groundwater. Hence, such condition of water needs to be treated before it can be distributed to the user. This study presents the combination usage of alum and potassium permanganate (KMnO4) in removing Fe2+ and Mn in the groundwater. The jar test was the main mechanism used in identifying the best optimum medium dosages (alum and KMnO4) as well as the best contact time for both mediums to efficiently remove Fe2+ and Mn in groundwater. In this study, water samples were taken from Chicha Water Treatment Plant in Kelantan. It can be said that both alum and KMnO4 managed to remove Fe2+ and Mn up to 35% and 45%, respectively when using alum dosage of 12 mg/L and KMnO4 dosage of 1.5mg/L with a contact time of 40 minutes. In addition, both mediums also managed to remove other parameters such as colour, turbidity, cations, and pH.
3

De Moor, E., and J. Mueller. "Austenite Growth and Retention Simulations in Intercritically Annealed Medium Manganese Steels." In MS&T17. MS&T17, 2017. http://dx.doi.org/10.7449/2017/mst_2017_446_453.

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4

De Moor, E., and J. Mueller. "Austenite Growth and Retention Simulations in Intercritically Annealed Medium Manganese Steels." In MS&T17. MS&T17, 2017. http://dx.doi.org/10.7449/2017mst/2017/mst_2017_446_453.

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5

Glover, A., J. Speer, and E. De Moor. "Tempering and Austempering Response of a Double Soaked Medium-Manganese Steel." In MS&T18. MS&T18, 2018. http://dx.doi.org/10.7449/2018mst/2018/mst_2018_313_320.

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6

Glover, A., J. Speer, and E. De Moor. "Tempering and Austempering Response of a Double Soaked Medium-Manganese Steel." In MS&T18. MS&T18, 2018. http://dx.doi.org/10.7449/2018/mst_2018_313_320.

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7

Ermolaeva, S. V. "Drinking water contaminants as risk factors for the health of the Ulyanovsk region population." In VIII Vserossijskaja konferencija s mezhdunarodnym uchastiem «Mediko-fiziologicheskie problemy jekologii cheloveka». Publishing center of Ulyanovsk State University, 2021. http://dx.doi.org/10.34014/mpphe.2021-92-94.

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The main goal of health risk analysis is to obtain and generalize information about the possible influence of environmental factors on human health. As a result of hydrochemical analysis of drinking water supply sources in the Ulyanovsk region, a list of main contaminants has been established. It includes ammonium, iron, copper, phosphates, sulfates, chlorides, nitrates, zinc, manganese and chromium. Among them three pollutants - iron, manganese and sulfates – had surpassed maximum permissible concentration. The concentration of iron at the level of threshold chronic effects was found in drinking water of Baryshsky (0.13), Melekessky (0.16), Sengileevsky (0.13) districts. Severe chronic effects can be caused by the concentration of iron and manganese in the drinking water of the Staromainsky (0.4 and 0.3) and Cherdaklinsky (0.9 and 0.27) districts. Assessment of health risks led us to the conclusion that drinking water can serve as an additional risk factor and provoke disease development. Key words: risk factors, morbidity, maximum permissible concentration, pollutants, relative conditional risk, average daily dose.
8

Aripin, H., I. Made Joni, Nundang Busaeri, Ifkar Usrah, I. Nyoman Sudiana, and Svilen Sabchevski. "Banana peel reductant for leaching medium grade manganese ore in sulfuric acid solution." In PROCEEDINGS FROM THE 14TH INTERNATIONAL SYMPOSIUM ON THERAPEUTIC ULTRASOUND. Author(s), 2017. http://dx.doi.org/10.1063/1.4978093.

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9

Cai, Zhihai, Ping Zhang, Xiubing Liang, Fanliang Tantai, and Fan Yang. "Research of Microstructure and Performance of Laser Cladding Fe-based Medium Manganese Alloy." In 2015 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icmmcce-15.2015.210.

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10

Paristiawan, Permana Andi, Adi Noer Syahid, Dedi Pria Utama, Rahadian Roberto, Miftakhur Rohmah, and Faried Miftahur Ridlo. "The effect of holding times and quenching variations on medium manganese steel-13%." In 5TH INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2022): Strengthening research and innovation in metallurgy and materials for sustainable economic development. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0186158.

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Звіти організацій з теми "Medium manganèse":

1

Washburn, Quinn L., Savannah Spradlin, and Carolyn F. Weber. Addition of Zinc, Manganese, and Iron to Growth Media Triggers Antibiotic Production in Bacterial Isolates From the Lower Atmosphere. Journal of Young Investigators, March 2017. http://dx.doi.org/10.22186/jyi.32.2.7-11.

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