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Gotowa bibliografia na temat „Mn TWIP/TRIP Steels”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Mn TWIP/TRIP Steels"

Jung, Jong-Ku, Oh-Yeon Lee, Young-Koo Park, Dong-Eun Kim i Kwang-Geun Jin. "Hydrogen Embrittlement Behavior of High Mn TRIP/TWIP Steels". Korean Journal of Materials Research 18, nr 7 (27.07.2008): 394–99. http://dx.doi.org/10.3740/mrsk.2008.18.7.394.

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Wang, Li Hui, Di Tang, Hai Tao Jiang, Ji Bin Liu i Yu Chen. "Effects of Different Manganese Content on Microstructures and Properties of TWIP Steel". Advanced Materials Research 399-401 (listopad 2011): 254–58. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.254.

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By analysis of TWIP Steels with different manganese content, the results showed that the microstructures and properties had been changed with different Mn content. The elongation of the tested steel with 22.5% Mn was high for 55.5 % and n value of that reached to 0.360. When Mn content of the tested steel was 17.9%, the yield and tensile strength were higher and its elongation was lower for the tested steel than that of the tested steel with 22.5% Mn. The microstructures of the tested steel with high Mn content were austenite before and after being stretched at room temperature. Mn content was decreased and the microstructure of the tested steel after being stretched had a small amount of martensite transformation at room temperature. That is to say, double effect with TWIP and TRIP had occurred, but TWIP effect was dominant. TWIP effect increased plasticity and strain hardening capacity to improve formability. TRIP effect was mainly to improve strength so as to further attain the strength of the tested steel.

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Campagnoli, Elena, Paolo Matteis, Giovanni M. M. Mortarino i Giorgio Scavino. "Thermal Diffusivity of Traditional and Innovative Sheet Steels". Defect and Diffusion Forum 297-301 (kwiecień 2010): 893–98. http://dx.doi.org/10.4028/www.scientific.net/ddf.297-301.893.

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The low carbon steels, used for the production of car bodies by deep drawing, are gradually substituted by high strength steels for vehicle weight reduction. The drawn car body components are joined by welding and the welded points undergo a reduction of the local tensile strength. In developing an accurate welding process model, able to optimized process parameters and to predict the final local microstructure, a significant improvement can be given by the knowledge of the welded steels thermal diffusivity at different temperatures. The laser-flash method has been used to compare the thermal diffusivity of two traditional deep drawing steels, two high strength steels already in common usage, i.e. a Dual Phase (DP) steel and a TRansformation Induced Plasticity (TRIP) steel, and one experimental high-Mn austenitic TWIP (Twinning Induced Plasticity) steel. The low carbon steels, at low temperatures, have a thermal diffusivity that is 4-5 times larger than the TWIP steel. Their thermal diffusivity decreases by increasing temperature while the TWIP steel shows an opposite behaviour, albeit with a lesser slope, so that above 700°C the TWIP thermal diffusivity is larger. The different behaviour of the TWIP steel in respect to the ferritic deep drawing steels arises from its non ferro-magnetic austenitic structure. The DP and TRIP steels show intermediate values, their diffusivity being lower than that of the traditional deep drawing steels; this latter fact probably arises from their higher alloy content and more complex microstructure.

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Borek, Wojciech, Małgorzata Czaja, Krzysztof Labisz, Tomasz Tański, Mariusz Krupiński i Stanislav Rusz. "High Manganese Austenitic X6MnSiAlNbTi26-3-3 Steel - Characteristic, Structures and Properties". Advanced Materials Research 1036 (październik 2014): 18–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1036.18.

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The aim of this paper is to determine the high-manganese austenite propensity to twinning induced by the cold working and its effect on structure and mechanical properties, and especially the strain energy per unit volume of new-developed high-manganese Fe – Mn – (Al, Si) investigated steel with various structures after their thermo-mechanical treatments. The new-developed high-manganese steel provides an extensive potential for automotive industries through exhibiting the twinning induced plasticity (TWIP) and transformation induced plasticity (TRIP) mechanisms. TWIP steels not only show excellent strength, but also have excellent formability due to twinning, thereby leading to excellent combination of strength, ductility, and formability over conventional dual phase steels or transformation induced plasticity TRIP steels. The microstructure evolution in successive stages of deformation was determined in metallographic investigations using light, scanning and transmission electron microscopies as well as X-ray diffraction methods.

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Peng, Ru Lin, Xiao Peng Liu, Yan Dong Wang, Shu Yan Zhang, Yong Feng Shen i Sten Johansson. "In-Situ Neutron Diffraction Study of the Deformation Behaviour of Two High-Manganese Austenitic Steels". Materials Science Forum 681 (marzec 2011): 474–79. http://dx.doi.org/10.4028/www.scientific.net/msf.681.474.

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In-situ neutron diffraction experiments under tensile loading were carried out to study the micromechanical behaviour of two iron-manganese based steels, a TWIP (twinning induced plasticity) steel with 30 wt% Mn and a TRIP steel (transformation induced plasticity) with 20 wt% Mn. The former was loaded to 31.3% strain and the latter to 20% strain. The 30 wt.% Mn steel had a fully austenitic microstructure which remained stable over the loading range studied, while stress induced austenite to α´- and ε-martensite transformations occur in the 20 wt.% Mn steel which initially contained an α´-martensite in addition to the austenite. The evolution of lattice strains under tensile loading differs between the two steels, reflected their different plastic deformation mechanisms. A stronger grain-orientation dependent behaviour is observed during deformation for the 20 wt.% Mn in contrast to the 30wt.% Mn steel.

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Solana Reyes, Yadira, JOSE ANGEL RAMOS BANDERAS, PEDRO GARNICA GONZALEZ i Alondra Jacqueline BOCANEGRA HUERAMO. "MECHANICAL BEHAVIOR OF AN HIGH STRENGHT STEEL (AHSS) WITH MEDIUM MN CONTENT IN TWO ROLLING CONDITIONS: HOT AND WARM". DYNA 98, nr 5 (1.09.2023): 521–26. http://dx.doi.org/10.6036/10895.

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The microstructure before intercritical annealing of an AHSS (Advanced High Strength Steel) with medium Mn content plays an important role in the final mechanical properties, since the transformations occurring during annealing modify phases, composition, and morphology. The microstructural changes that occur during intercritical annealing treatment of a medium Mn steel were examined. Two starting material comes from different conditions, hot rolling at 1200°C and warm rolling (initial rolling at 1200°C and subsequent at 680°C). The mechanical properties were related to the transformation phenomena that occur in these steels, mainly TRIP (Transformation Induced Plasticity) and TWIP (Twinning Induced Plasticity) effects. The transformations were verified by SEM (Scanning Electron Microscopy) and X-RD (X-Ray Diffraction). Tensile strength values of 1111 MPa and 17% elongation were obtained by hot rolling route. For the warm rolling route, 35% deformation and a tensile strength of 1357 MPa were obtained. The strain hardening curve was analyzed, showing the presence of the TWIP effect subsequently "saw" behavior related to the discontinuous TRIP effect. The mechanic properties values are related to the difference in morphology phases present. An acicular morphology of a/? (ferrite/austenite) provides a higher value of tensile strength, but low elongation percentage, and a mixture of lamellar and globular morphologies, provides an optimized combination of strength and ductility. Key words: AHSS, medium manganese steel, rolling, heat treatment, discontinuous TRIP effect, TWIP.

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Mintz, Barrie, i Abdullah Qaban. "The Influence of Precipitation, High Levels of Al, Si, P and a Small B Addition on the Hot Ductility of TWIP and TRIP Assisted Steels: A Critical Review". Metals 12, nr 3 (16.03.2022): 502. http://dx.doi.org/10.3390/met12030502.

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The hot ductility of Transformation Induced Plasticity (TRIP) and Twinning Induced Plasticity (TWIP) steels is reviewed, concentrating on the likelihood of cracking occurring on continuous casting during the straightening operation. In this review, the influence of high levels of Al, Si, P, Mn and C on their hot ductility will be discussed as well as the important role B can play in improving their hot ductility. Of these elements, Al has the worst influence on ductility but a high Al addition is often needed in both TWIP and TRIP steels. AlN precipitates are formed often as thin coatings covering the austenite grain surfaces favouring intergranular failure and making them difficult to continuous cast without cracks forming. Furthermore, with TWIP steels the un-recrystallised austenite, which is the state the austenite is when straightening, suffers from excessive grain boundary sliding, so that the ductility often decreases with increasing temperature, resulting in the RA value being below that needed to avoid cracking on straightening. Fortunately, the addition of B can often be used to remedy the deleterious influence of AlN. The influence of precipitation hardeners (Nb, V and Ti based) in strengthening the room temperature yield strength of these TWIP steels and their influence on hot ductility is also discussed.

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Dobrzański, L. A., i W. Borek. "Thermo-mechanical treatment of Fe–Mn–(Al, Si) TRIP/TWIP steels". Archives of Civil and Mechanical Engineering 12, nr 3 (wrzesień 2012): 299–304. http://dx.doi.org/10.1016/j.acme.2012.06.016.

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Yang, Ping, Tong-Yan Liu, Fa-Yun Lu i Li Meng. "Orientation Dependence of Martensitic Transformation in High Mn TRIP/TWIP Steels". steel research international 83, nr 4 (13.02.2012): 368–73. http://dx.doi.org/10.1002/srin.201100307.

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Kusakin, Pavel, Marina Tikhonova, Andrey Belyakov i Rustam Kaibyshev. "On Primary Recrystallization of High-Mn Austenitic Steels". Defect and Diffusion Forum 385 (lipiec 2018): 337–42. http://dx.doi.org/10.4028/www.scientific.net/ddf.385.337.

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The grain refinement is an effective approach to strengthen high-Mn TWIP/TRIP steels. The development of recrystallized microstructure with a grain size of about one micron increases the yield strength of high-Mn steels above 500 MPa. The fine grained microstructures can be easily developed by cold rolling followed by primary recrystallization. The recrystallized grain size can be expressed by a power law function of the strain hardening during the previous cold rolling with an exponent of -2. Taking the dislocation density as the main strengthener, the grain size is an inverse proportion to the dislocation density. Then, the number density of recrystallized grains can be expressed by a power law function of dislocation density evolved during cold rolling with an exponent of about 2.

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Rozprawy doktorskie na temat "Mn TWIP/TRIP Steels"

Hamada, A. S. (Atef Saad). "Manufacturing, mechanical properties and corrosion behaviour of high-Mn TWIP steels". Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514285844.

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Abstract Austenitic high-Mn (15–30 wt.%) based twinning-induced plasticity (TWIP) steels provide great potential in applications for structural components in the automotive industry, owing to their excellent tensile strength-ductility property combination. In certain cases, these steels might also substitute austenitic Cr-Ni stainless steels. The aim of this present work is to investigate the high-temperature flow resistance, recrystallisation and the evolution of microstructure of high-Mn steels by compression testing on a Gleeble simulator. The influence of Al alloying (0–8 wt.%) in the hot rolling temperature range (800°C–1100°C) is studied in particular, but also some observations are made regarding the influence of Cr alloying. Microstructures are examined in optical and electron microscopes. The results are compared with corresponding properties of carbon and austenitic stainless steels. In addition, the mechanical properties are studied briefly, using tension tests over the temperature range from -80°C to 200°C. Finally, a preliminary study is conducted on the corrosion behaviour of TWIP steels in two media, using the potentiodynamic polarization technique. The results show that the flow stress level of high-Mn TWIP steels is considerably higher than that of low-carbon steels and depends on the Al concentration up to 6 wt.%, while the structure is fully austenitic at hot rolling temperatures. At higher Al contents, the flow stress level is reduced, due to the presence of ferrite. The static recrystallisation kinetics is slower compared to that of carbon steels, but it is faster than is typical of Nb-microalloyed or austenitic stainless steels. The high Mn content is one reason for high flow stress as well as for slow softening. Al plays a minor role only; but in the case of austenitic-ferritic structure, the softening of the ferrite phase occurs very rapidly, contributing to overall faster softening. The high Mn content also retards considerably the onset of dynamic recrystallisation, but the influence of Al is minor. Similarly, the contribution of Cr to the hot deformation resistance and static and dynamic recrystallisation, is insignificant. The grain size effectively becomes refined by the dynamic and static recrystallisation processes. The tensile testing of TWIP steels revealed that the Al alloying and temperature have drastic effects on the yield strength, tensile strength and elongation. The higher Al raises the yield strength because of the solid solution strengthening. However, Al tends to increase the stacking fault energy that affects strongly the deformation mechanism. In small concentrations, Al suppresses martensite formation and enhances deformation twinning, leading to high tensile strength and good ductility. However, with an increasing temperature, SFE increases, and consequently, the density of deformation twins decreases and mechanical properties are impaired. Corrosion testing indicated that Al alloying improves the corrosion resistance of high-Mn TWIP steels. The addition of Cr is a further benefit for the passivation of these steels. The passive film that formed on 8wt.% Al-6wt.%Cr steel was found to be even more stable than that on Type 304 steel in 5–50% HNO3 solutions. A prolonged pre-treatment of the steel in the anodic passive regime created a thick, protective and stable passive film that enhanced the corrosion resistance also in 3.5% NaCl solution.

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Saeed-Akbari, Alireza [Verfasser]. "Mechanism Maps, Mechanical Properties, and Flow Behavior in High-Manganese TRIP/TWIP and TWIP Steels / Alireza Saeed-Akbari". Aachen : Shaker, 2011. http://d-nb.info/107408795X/34.

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Di, Chiro Andrew. "Processing and properties of C-Si-Mn trip steels". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/MQ44003.pdf.

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Chen, Zhenglin. "Modeling of Microstructure Evolution Induced by Surface Mechanical Attrition Treatment in TWIP/TRIP Steels". Thesis, Troyes, 2020. http://www.theses.fr/2020TROY0017.

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Ce travail est centré sur la modélisation de l’évolution de microstructures induite par le procédé SMAT pour des aciers TWIP/TRIP. Les caractéristiques de base d’un acier TWIP/TRIP sont mises en évidence par MEB, DRX et nanoindentation. La nanoindentation est appliquée sur différentes couches pour l’étude des propriétés mécaniques du matériau à gradient de microstructure. Un modèle basé sur la densité de dislocations tenant compte de l’influence du maclage et de la transformation de phase martensitique dans un acier TWIP/TRIP est proposé pour étudier l’influence des paramètres induits par SMAT. Ensuite, la densité de dislocations dans l’austénite et celle dans la martensite ainsi que les fractions volumiques de macles et de martensite au cours d’un impact sont évaluées numériquement avec un modèle d’éléments finis. Par ailleurs, afin d’étudier l’évolution de l’endommagement pendant le processus d’impact, l’endommagement a été introduit dans le modèle de la densité de dislocations. Enfin, un modèle visco-élastoplastique basé sur la densité de dislocations considérant l’effet de la taille de grain, le maclage et le taux de déformation a été proposé afin de mieux comprendre les effets du SMAT sur les propriétés mécaniques d’un acier TWIP/TRIP avec gradient de microstructure. Ainsi, pour étudier la réponse globale du matériau SMATé, la loi de mélange est utilisée en considérant le gradient du matériau comme une structure composée de différentes couches avec des microstructures et des propriétés mécaniques différentes
This work focuses on modeling the microstructure evolution induced by SMAT in TWIP and/or TRIP steels. The features of the generated gradient microstructure of a 304L TWIP/TRIP steel are characterized by SEM, XRD, and nanoindentation. Nanoindentation is applied on different layers for the investigation of the mechanical properties of the gradient microstructure. Based on the experimental results, a dislocation density model considering the influence of twinning and martensitic transformation of TWIP/TRIP steel is proposed to investigate the effect of SMAT controlling parameters. Then the dislocation density of the austenite and that of the martensite as well as the volume fraction of twinning and martensitic transformation during impact loading is numerically evaluated using a full finite element model. Afterwards, to study the evolution of the damage during the SMAT process, the damage was introduced in the dislocation density model. Finally, a dislocation density based visco-elastoplastic model considering the effect of grain size, dislocation density, twin, and strain rate was proposed to further understand the effect of impact loadings on the mechanical properties of TWIP/TRIP steel with gradient microstructure based on the results of nanoindentation tests. Then to study the overall elastoplastic response of the SMATed material, the rule of mixtures is used by considering the gradient material as a gradient structure consisting of different layers with distinct microstructures and mechanical properties

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Zarei, Hanzaki Abbass. "Transformation characteristics of Si-Mn TRIP steels after thermomechanical processing". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41798.

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Thermomechanical processing, which is a combination of deformation and heat treatment, is an optimum method to control the microstructural evolution and, accordingly, to generate the desired mechanical properties of materials. TRIP (Transformation-Induced-Plasticity) behavior is a powerful mechanism with which to improve mechanical properties. The basis of TRIP behavior is the retention of austenite with optimum characteristics (volume fraction, stability, size, morphology and composition) at room temperature. The transformation of retained austenite to martensite during deformation can lead to TRIP-enhanced properties. This work deals with the effects of thermomechanical processing parameters on the microstructural characteristics of TRIP steels, primarily from the point of view of the retained austenite condition in Si-Mn and Si-Mn-Nb bearing TRIP steels. Initially, a new test technique based on continuous cooling compression (CCC) testing was developed to find the critical temperatures of thermomechanical processing (TMP). A major finding from the CCC test is the ability to determine the $Ae sb3$ (equilibrium austenite-to-ferrite transformation) temperature. In the CCC test, the $Ae sb3$ appeared to be associated with an increase in the rate of increase in flow stress with decreasing temperature. In order to further evaluate this result, neutron diffractometry at high temperatures was used to monitor any crystallographic changes associated with the metastable region. The results revealed an increase in the rate of contraction of the austenite lattice as the temperature decreases through the metastable state (below $Ae sb3),$ compared with that observed as the temperature decreases through the stable austenite region. Having defined the critical TMP temperatures, the effects of processing parameters on the state of the retained austenite were examined by changing the thermomechanical processing conditions. These effects were more fundamentally considered by tak

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Wang, Meimei Verfasser], Dierk [Akademischer Betreuer] [Raabe i Wolfgang [Akademischer Betreuer] Bleck. "Nanolaminate TRIP-TWIP martensitic matrix steels : design and characterization / Meimei Wang ; Dierk Raabe, Wolfgang Bleck". Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1130589994/34.

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Wang, Meimei [Verfasser], Dierk [Akademischer Betreuer] Raabe i Wolfgang [Akademischer Betreuer] Bleck. "Nanolaminate TRIP-TWIP martensitic matrix steels : design and characterization / Meimei Wang ; Dierk Raabe, Wolfgang Bleck". Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1130589994/34.

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Guo, Xiaofei [Verfasser]. "Influences of Microstructure, Alloying Elements and Forming Parameters on Delayed Fracture in TRIP/TWIP-Aided Austenitic Steels / Xiaofei Guo". Aachen : Shaker, 2012. http://d-nb.info/1066197296/34.

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Mendonça, Roberto Ramon. "Soldagem por fricção e mistura mecânica de aço austenítico alto manganês com efeito TRIP". Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-14102014-082116/.

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O desenvolvimento e utilização de novos materiais, mais leves e com propriedades mecânicas superiores aos atuais, se mostram extremamente importantes devido à redução de peso e consequentemente redução na emissão de gases poluentes que poderiam gerar. As ligas de Fe-Mn-C com elevados teores de Mn (20-30%) representam um desenvolvimento muito recente de aços austeníticos, que, através dos seus mecanismos diferenciados de deformação reúnem elevada resistência mecânica com grande ductilidade. Essa nova classe de materiais estruturais possibilita uma efetiva redução de custos na produção através do reduzido tempo de processamento (sem a necessidade de tratamentos térmicos especiais e de processamentos termomecânicos controlados). A soldagem é, atualmente, o mais importante processo de união de metais usado no setor industrial. Dentro da variada gama de processos de soldagem existentes, a soldagem por fricção e mistura mecânica (SFMM, em inglês: Friction Stir Welding - FSW) se destaca por ser um processo de união no estado sólido que apresenta uma série de vantagens sobre as tecnologias convencionais de soldagem por fusão. Do ponto de vista metalúrgico, uma das suas principais vantagens se manifesta justamente na junção de materiais dissimilares, visto que o grau de mistura de composições e as transformações de fases entre materiais incompatíveis podem ser minimizados. Outra vantagem é que há um refino de grão no cordão de solda comparado com a microestrutura fundida que se forma nos processos convencionais. Este trabalho teve como objetivo produzir em escala laboratorial os aços de alta liga ao manganês com efeito TRIP, avaliar o impacto da velocidade de rotação da ferramenta na soldagem por fricção e mistura mecânica e avaliar a microestrutura e propriedades mecânicas das juntas soldadas. A microestrutura das juntas soldadas caracterizou-se pela presença apenas da zona de mistura e do metal base, além da formação de \'anéis de cebola\' na zona de mistura, esta não mostrou sinais de transformação martensítica induzida por deformação e sofreu recristalização dinâmica para todas as velocidades de rotação investigadas com a formação de grãos refinados e com morfologia equiaxial. Os corpos de tração fraturaram todos nos metais de base, mostrando que as propriedades mecânicas da zona de mistura foram superiores à do metal base e que a variação de aporte térmico alcançada com a velocidade de rotação da ferramenta não comprometeu a qualidade das juntas soldadas.
The development and application of new light materials with superior mechanical properties is extremely important to weight reduction in vehicles and consequently reduction of greenhouse gases emission. The Fe-Mn-C steels with high Mn (20-30%) are a recent development of austenitic steels, which, due to their different mechanisms of deformation, possesses high strength and high ductility as well. In addition, this new type of structural steel allows an effective reduction of manufacturing costs due to its reduced processing time (it does not require special heat treatments and controlled thermo mechanical processing). Welding has been one of the most important processes for joining metals. Among the available welding processes, friction stir welding (FSW) is notable for being a solid state process with great advantages over the conventional welding methods. In the mettalurgical point of view, welding dissimilar materials is a significant advantage of FSW over the other process. The main reason is the reduction of mixture of material and phase transformations between the incompatible materials in the weld. Moreover, grain refinement is another advantage from the process. The present study aimed to produce laboratorial scale high Mn steels with TRIP effect, investigate the impact of tool speed ont the microstructure and mechanical properties of friction stir welded joints. The microstructure of the welded joints exhibited only the stirred zone (SZ) and the base material (BM), besides the presence of ´onion rings´ within the stirred zone. The SZ exhibited no signs of martensite suggesting that dynamic recrystallization have occurred for all the speed tested. Moreover, the grains in the SZ had equiaxial morphology and were significantly refined. The fracture of the tensile specimens occurred in the base material, bringing to light that the welding process was beneficial to the mechanical properties. Furthermore, the variation of heat input achieved with the speed did not compromise the quality of welded joints.

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Ferrer, Modesto Hurtado. "Estudo das transformações de fase de aços TRIP ao Si-Mn microligados com Nb". Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-05082003-115928/.

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Estudou-se a cinética das transformações de fase em resfriamento contínuo e em tratamentos isotérmicos de cinco ligas de aços TRIP microligados com Nb, contendo teores variáveis de Mn e Si, através de ensaios dilatométricos, de caracterização morfológica dos produtos de transformação e de cálculos termodinâmicos e simulações numéricas usando os programas Thermocalc ® e Dictra®. Foram determinados os diagramas RC para a transformação da austenita, e foi estudada a influência da precipitação de ferrita pró-eutetóide e de bainita na fração volumétrica de austenita retida. Através dos diagramas de resfriamento contínuo foi possível delimitar a extensão do campo intercrítico dos cinco aços analisados, com determinação da janela de resfriamento e seus intervalos de temperaturas. Isso permitiu projetar os ciclos de resfriamento controlado a serem aplicados durante o processamento termomecânico dos Aços TRIP-D, TRIP-E e TRIP-H. Os cálculos pelo modelo numérico de redistribuição de carbono e de elementos substitucionais na interface ferrita/austenita, bem como as medidas de microanálise química por WDS e EDS permitiram verificar que a taxa de crescimento da ferrita pró-eutetóide é controlada pela difusão do carbono na austenita. Para tempos curtos de tratamento, o modelo de crescimento que melhor se ajusta é o do equilíbrio local com partição negligível de soluto. Verificou-se através de tratamentos isotérmicos no campo bainítico, que o silício atrasa a precipitação de carbonetos durante a reação bainítica, o que justifica o aumento da estabilidade da austenita retida no aço de maior Si (TRIP-H), quando comparado com o aço de menor Si (TRIP-E). Baseado nos resultados dos estudos das transformações de fase por resfriamento contínuo foram selecionadas as ligas TRIP-D, TRIP-E e TRIP-H, para simular dois esquemas de laminação controlada por meio de ensaios de torção a quente. Nesses ensaios foram variados o grau de deformação e a temperatura de acabamento, de modo a estudar os efeitos dos parâmetros de deformação mecânica na fração transformada dos diferentes constituintes microestruturais, e em particular na fração volumétrica de austenita retida. O primeiro ensaio refere-se à laminação controlada por recristalização estática (LCRE) e o segundo à laminação convencional (LCC), com temperatura de acabamento de 1030°C e 850°C, respectivamente. O resfriamento consistiu em dois tratamentos isotérmicos consecutivos: o primeiro no campo intercrítico (austenita + ferrita), e o segundo no campo bainítico. O aumento do grau de deformação na simulação por torção a quente da laminação controlada por recristalização estática, levou a um aumento da porcentagem de austenita retida obtida durante o resfriamento controlado (de 9 a 14,0 %). O acúmulo de energia de deformação abaixo da TNR na simulação do processo de laminação controlada convencional provocou uma diminuição da fração volumétrica de austenita retida bem como da concentração de carbono contido nela. Os perfis de Mn e C obtidos a partir de análises químicas com EDS e WDS em amostras do aço TRIP-E, deformadas com deformação total de 2,1 e deformação total de 2,8, mostram a contribuição do refinamento de grão para a difusão destes elementos na frente da interface ferrita/austenita, durante a precipitação de ferrita pró-eutetóide.
The phase transformation kinetics of five Nb microalloyed Si-Mn TRIP steels was studied under continuous cooling and isothermal treatments, using dilatometric techniques, morphologic characterization, Thermocalc computational thermodynamics and Dictra numerical simulation. WDS and EDS X-ray microanalysis and Dictra numerical modeling of C, Mn and Si distribution during transformation showed that the reaction is carbon diffusion controlled and growth occurs under local equilibrium with negligible partition. CCT diagrams for austenite transformation were determined and the effect of the amount of proeutectoid ferrite and bainite precipitation on the volume fraction of retained austenite was also estimated. The CCT diagrams allowed determining the boundaries of the critical zone and the processing window to obtain bainite plus austenite microstructures. Based on this information cooling cycles were selected to perform thermomechanical treatments. Three TRIP steels were selected to simulate, in a hot torsion testing machine, two different controlled rolling sequences: Recrystallization Controlled Rolling and Conventional Controlled Rolling. The influence of the degree of deformation and the finishing temperature on the amount of retained austenite was studied. After rolling the cooling cycle comprised two isothermal treatments, one in the austenite + ferrite field and the other in the bainitic field. Increasing the strain during simulation of Recrystallization Controlled Rolling led to an increase in the volume fraction of retained austenite to the range 9 to 14 %. The energy stored during simulation bellow TNR of the Conventional Controlled Rolling led to a decrease in the volume fraction and in the carbon content of retained austenite. The Mn and C contents measured by EDS and WDS analysis of TRIP-E steel, showed that grain refinement due to recrystallization contributes to diffusion of these elements in front of the ferrite/austenite interface during precipitation.

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Książki na temat "Mn TWIP/TRIP Steels"

Weidner, Anja. Deformation Processes in TRIP/TWIP Steels. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4.

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Biermann, Horst, i Christos G. Aneziris, red. Austenitic TRIP/TWIP Steels and Steel-Zirconia Composites. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42603-3.

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Weidner, Anja. Deformation Processes in TRIP/TWIP Steels: In-Situ Characterization Techniques. Springer International Publishing AG, 2021.

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Weidner, Anja. Deformation Processes in TRIP/TWIP Steels: In-Situ Characterization Techniques. Springer, 2020.

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Aneziris, Christos G., i Horst Biermann. Austenitic TRIP/TWIP Steels and Steel-Zirconia Composites: Design of Tough, Transformation-Strengthened Composites and Structures. Springer International Publishing AG, 2020.

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Biermann, Horst. Austenitic TRIP/TWIP Steels and Steel-Zirconia Composites: Design of Tough, Transformation-Strengthened Composites and Structures. Springer Nature, 2020.

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Części książek na temat "Mn TWIP/TRIP Steels"

Dobrzański, Leszek A., Janusz Mazurkiewicz, Wojciech Borek i Małgorzata Czaja. "Newly-Developed High-Manganese Fe–Mn–(Al, Si) Austenitic TWIP and TRIP Steels". W Rolling of Advanced High Strength Steels, 224–88. Boca Raton, FL : CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315120577-6.

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Weidner, Anja. "Advanced High-Strength Steels". W Deformation Processes in TRIP/TWIP Steels, 71–98. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_4.

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Weidner, Anja. "Motivation". W Deformation Processes in TRIP/TWIP Steels, 1–5. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_1.

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Weidner, Anja. "Correction to: Deformation Processes in TRIP/TWIP Steels". W Deformation Processes in TRIP/TWIP Steels, C1. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_10.

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Weidner, Anja. "Plastic Deformation and Strain Localizations". W Deformation Processes in TRIP/TWIP Steels, 7–45. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_2.

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Weidner, Anja. "Martensitic Phase Transformation". W Deformation Processes in TRIP/TWIP Steels, 47–69. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_3.

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Weidner, Anja. "In Situ Techniques for Characterization of Strain Localizations and Time Sequence of Deformation Processes". W Deformation Processes in TRIP/TWIP Steels, 99–203. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_5.

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Weidner, Anja. "Object of Investigations—High-Alloy Fe–16Cr–6Mn–xNi–0.05C Cast Steels with TRIP/TWIP Effect". W Deformation Processes in TRIP/TWIP Steels, 205–44. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_6.

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Weidner, Anja. "Case Studies on Localized Deformation Processes in High-Alloy Fe–16Cr–6Mn–xNi–0.05C Cast Steels". W Deformation Processes in TRIP/TWIP Steels, 245–364. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_7.

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Weidner, Anja. "Prospects of Complementary In Situ Techniques". W Deformation Processes in TRIP/TWIP Steels, 365–84. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37149-4_8.

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Streszczenia konferencji na temat "Mn TWIP/TRIP Steels"

da Silva Lima, M. N. "Microstructural and corrosion study of a “non-comercial” high manganese steel". W Superplasticity in Advanced Materials. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902615-37.

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Abstract. High-Mn steels have great plasticity when subjected to deformation due to TWIP or TRIP effects. This work evaluated the microstructural evolution, the formation of the -Martensite phase taking into account the hot rolling of 80-60% and the solution annealing. Afterwards, microstructures were analyzed by SEM. Volume fraction of the Austenite and -Martensite phases were measured by EBSD technique. The steel obtained low energy levels of stacking fault, favoring the effect TRIP. Corrosion resistance in 0.1M NaCl solution was analyzed by open potential circuit and potentiodynamic polarization techniques. The analysis of the curves and the surface of the steel after the polarization tests showed that the steel with less strain had relatively nobler potential than the steel with more strain.

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Zhang, X., T. Sawaguchi, K. Ogawa, F. Yin i X. Zhao. "Deformation microstructure of TRIP/TWIP Steels at the early deformation stages". W ESOMAT 2009 - 8th European Symposium on Martensitic Transformations. Les Ulis, France: EDP Sciences, 2009. http://dx.doi.org/10.1051/esomat/200905029.

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Hodgson, P., M. H. Cai i B. Rolfe. "Hot Forming of Medium Mn Steels with TRIP Effect". W The 2nd International Conference on Advanced High Strength Steel and Press Hardening (ICHSU 2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813140622_0005.

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Podany, Pavel, Jaromir Dlouhy, Martina Koukolikova, Petr Martinek, Radek Prochazka, Tomas Kubina i Michal Duchek. "Phase composition of 15Mn-0.1C-0.4/1.4Al-Si TRIP/TWIP steels after cold rolling and annealing". W 2016 7th International Conference on Mechanical and Aerospace Engineering (ICMAE). IEEE, 2016. http://dx.doi.org/10.1109/icmae.2016.7549520.

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Pradhan, R., S. C. Kelley, R. E. Fraley i J. F. Layland. "Some Performance Aspects of Dual-Phase Steels in Comparison to HSLA, C-Mn and TRIP Steels". W SAE 2004 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-01-0505.

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Varga, M., L. Janka, M. Rodríguez Ripoll, L. M. Berger, S. Thiele, V. Matikainen, P. Vuoristo, L. Janka i H. Ben Hamouda. "High Temperature Sliding of TiC Based Hardmetal Coatings Against TWIP Steel". W ITSC2021, redaktorzy F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau i in. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0278.

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Abstract Manufacturing of steel components is often done at high temperatures (HT) posing a serious challenge to components such as forming tools. Thermal spray coatings provide a cost-effective solution for surface protection under HT, corrosive environments and severe wear conditions. Thermally sprayed coatings based on cubic hard materials such as TiC and TiCN can provide an alternative to widely used Cr3C2-NiCr. While the latter possess a superb oxidation resistance and wear resistance at HT, they are prone to degradation in the presence of Mn, an element commonly alloyed in many modern steel grades such as TWIP (twinning-induced plasticity steel). In this study, a (Ti,Mo)(C,N)-29% Ni hardmetal feedstock powder was prepared by agglomeration and sintering. Coatings were deposited using a high velocity air-fuel (HVAF) spray process. The coating was benchmarked against a standard Cr3C2-NiCr coating obtained with the same spray process. Our work comprises analyses of the feedstock powder along with the resulting coating microstructure after deposition and heat treatment. Further, the HT sliding behavior against TWIP steel using a HT pin-on-disc tribometer at 700°C was investigated. The results showed a clear benefit of the TiCN-based coating, with almost no wear detected, while the Cr3C2-coating showed a significant wear loss. Based on these results, the TiCN-based coating is regarded as potential solution for prospective forming applications of modern high Mn steels, such as TWIP.

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Weslei Patrick Teodósio Sousa, Dagoberto Brandão Santos i Sara Silva Ferreira de Dafé. "Estudo dos mecanismos de deformação em um aço TRIP/TWIP com 17% de Mn e baixo C submetido a esforços de tração". W IX Congresso Nacional de Engenharia Mecânica. Rio de Janeiro, Brazil: ABCM Associação Brasileira de Engenharia e Ciências Mecânicas, 2016. http://dx.doi.org/10.20906/cps/con-2016-0391.

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