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Goyos L. Pérez - One of the best experts on this subject based on the ideXlab platform.
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Selección e implementación de un modelo para el inicio de la transformación perlítica durante el enfriamiento en los aceros con baja aleación.
Instituto Superior Politécnico José Antonio Echeverría - Cujae, 2007Co-Authors: Lobaina R. Sánchez, Goyos L. PérezAbstract:Los diagramas Tiempo Temperatura Transformación (TTT) de los aceros son de vital importancia para la industria vinculada a la elaboración de los aceros. El desarrollo alcanzado en la obtención de modelos matemáticos de estas curvas ha permitido acercar al ingeniero investigador de la industria y al estudiante, a la comprensión de las variables influyentes en la transformación austenítica, y el impacto que éstas tienen en la modelación de las curvas. En el presente trabajo se valoran diferentes modelos presentados en la literatura consultada. Como resultado, se muestra un modelo para las curvas de inicio de la transformación perlítica, conociendo la composición de los aceros, el tamaño de grano, el sobreenfriamiento y la energía de activación, que son las variables que determinan las diferentes formas que adoptan las curvas. La implementación del modelo seleccionado, ofrece un acercamiento a la posibilidad de crear un aula virtual utilizando una metodología de cálculo, y una herramienta para continuar avanzando en la dirección de perfeccionar y ampliar las posibilidades del resultado presentado.Time-Temperature-Transformation diagrams of steels are of great importance for industry related to steel manufacturing. The development reached in obtaining mathematic models for these curves has allowed the industry research engineer and student to be closer to the comprehension of the influential variables in the austenitic Transformation. In this paper different models presented in the consulted literature were valorated. As a result, we show a model for the starting Pearlitic Transformation curves, depending of the steel composition, the grain size, the undercooling temperature, and the activation energy. The mentioned determine the different shapes the curves. The use of this model gives us the possibility of approaching to the creation of a virtual classroom using the calculation methodology, as well as a tool to improve and widen the possibilities of the result presented in this work
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'Selección e implementación de un modelo para el inicio de la transformación perlítica durante el enfriamiento en los aceros con baja aleación. R. // Selection and use of a model for the beginning of Pearlitic Transformation during the cooling in low allo
Instituto Superior Politécnico José Antonio Echeverría - Cujae, 2007Co-Authors: Lobaina R. Sánchez, Goyos L. PérezAbstract:Los diagramas Tiempo Temperatura Transformación (TTT) de los aceros son de vital importancia para la industriavinculada a la elaboración de los aceros. El desarrollo alcanzado en la obtención de modelos matemáticos de estas curvasha permitido acercar al ingeniero investigador de la industria y al estudiante, a la comprensión de las variables influyentesen la transformación austenítica, y el impacto que éstas tienen en la modelación de las curvas. En el presente trabajo sevaloran diferentes modelos presentados en la literatura consultada. Como resultado, se muestra un modelo para las curvasde inicio de la transformación perlítica, conociendo la composición de los aceros, el tamaño de grano, el sobreenfriamientoy la energía de activación, que son las variables que determinan las diferentes formas que adoptan las curvas. Laimplementación del modelo seleccionado, ofrece un acercamiento a la posibilidad de crear un aula virtual utilizando unametodología de cálculo, y una herramienta para continuar avanzando en la dirección de perfeccionar y ampliar lasposibilidades del resultado presentado.Palabras claves: modelos de transformación austenítica, diagramas de transformación isotérmica, diagramasTTT.____________________________________________________________________________Abstract:Time-Temperature-Transformation diagrams of steels are of great importance for industry related to steel manufacturing.The development reached in obtaining mathematic models for these curves has allowed the industry research engineer andstudent to be closer to the comprehension of the influential variables in the austenitic Transformation. In this paper differentmodels presented in the consulted literature were valorated. As a result, we show a model for the starting PearliticTransformation curves, depending of the steel composition, the grain size, the undercooling temperature, and the activationenergy. The mentioned determine the different shapes the curves. The use of this model gives us the possibility ofapproaching to the creation of a virtual classroom using the calculation methodology, as well as a tool to improve andwiden the possibilities of the result presented in this work.Key word: Kirkaldy model, TTT, diffusional Transformation austenite.
Lobaina R. Sánchez - One of the best experts on this subject based on the ideXlab platform.
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Selección e implementación de un modelo para el inicio de la transformación perlítica durante el enfriamiento en los aceros con baja aleación.
Instituto Superior Politécnico José Antonio Echeverría - Cujae, 2007Co-Authors: Lobaina R. Sánchez, Goyos L. PérezAbstract:Los diagramas Tiempo Temperatura Transformación (TTT) de los aceros son de vital importancia para la industria vinculada a la elaboración de los aceros. El desarrollo alcanzado en la obtención de modelos matemáticos de estas curvas ha permitido acercar al ingeniero investigador de la industria y al estudiante, a la comprensión de las variables influyentes en la transformación austenítica, y el impacto que éstas tienen en la modelación de las curvas. En el presente trabajo se valoran diferentes modelos presentados en la literatura consultada. Como resultado, se muestra un modelo para las curvas de inicio de la transformación perlítica, conociendo la composición de los aceros, el tamaño de grano, el sobreenfriamiento y la energía de activación, que son las variables que determinan las diferentes formas que adoptan las curvas. La implementación del modelo seleccionado, ofrece un acercamiento a la posibilidad de crear un aula virtual utilizando una metodología de cálculo, y una herramienta para continuar avanzando en la dirección de perfeccionar y ampliar las posibilidades del resultado presentado.Time-Temperature-Transformation diagrams of steels are of great importance for industry related to steel manufacturing. The development reached in obtaining mathematic models for these curves has allowed the industry research engineer and student to be closer to the comprehension of the influential variables in the austenitic Transformation. In this paper different models presented in the consulted literature were valorated. As a result, we show a model for the starting Pearlitic Transformation curves, depending of the steel composition, the grain size, the undercooling temperature, and the activation energy. The mentioned determine the different shapes the curves. The use of this model gives us the possibility of approaching to the creation of a virtual classroom using the calculation methodology, as well as a tool to improve and widen the possibilities of the result presented in this work
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'Selección e implementación de un modelo para el inicio de la transformación perlítica durante el enfriamiento en los aceros con baja aleación. R. // Selection and use of a model for the beginning of Pearlitic Transformation during the cooling in low allo
Instituto Superior Politécnico José Antonio Echeverría - Cujae, 2007Co-Authors: Lobaina R. Sánchez, Goyos L. PérezAbstract:Los diagramas Tiempo Temperatura Transformación (TTT) de los aceros son de vital importancia para la industriavinculada a la elaboración de los aceros. El desarrollo alcanzado en la obtención de modelos matemáticos de estas curvasha permitido acercar al ingeniero investigador de la industria y al estudiante, a la comprensión de las variables influyentesen la transformación austenítica, y el impacto que éstas tienen en la modelación de las curvas. En el presente trabajo sevaloran diferentes modelos presentados en la literatura consultada. Como resultado, se muestra un modelo para las curvasde inicio de la transformación perlítica, conociendo la composición de los aceros, el tamaño de grano, el sobreenfriamientoy la energía de activación, que son las variables que determinan las diferentes formas que adoptan las curvas. Laimplementación del modelo seleccionado, ofrece un acercamiento a la posibilidad de crear un aula virtual utilizando unametodología de cálculo, y una herramienta para continuar avanzando en la dirección de perfeccionar y ampliar lasposibilidades del resultado presentado.Palabras claves: modelos de transformación austenítica, diagramas de transformación isotérmica, diagramasTTT.____________________________________________________________________________Abstract:Time-Temperature-Transformation diagrams of steels are of great importance for industry related to steel manufacturing.The development reached in obtaining mathematic models for these curves has allowed the industry research engineer andstudent to be closer to the comprehension of the influential variables in the austenitic Transformation. In this paper differentmodels presented in the consulted literature were valorated. As a result, we show a model for the starting PearliticTransformation curves, depending of the steel composition, the grain size, the undercooling temperature, and the activationenergy. The mentioned determine the different shapes the curves. The use of this model gives us the possibility ofapproaching to the creation of a virtual classroom using the calculation methodology, as well as a tool to improve andwiden the possibilities of the result presented in this work.Key word: Kirkaldy model, TTT, diffusional Transformation austenite.
Liang Zuo - One of the best experts on this subject based on the ideXlab platform.
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magnetic field induced microstructural features in a high carbon steel during diffusional phase Transformation
Journal of Magnetism and Magnetic Materials, 2012Co-Authors: Claude Esling, Xiang Zhao, Xiaoxue Zhang, Yudong Zhang, Minglong Gong, Liang ZuoAbstract:In this work, a high purity, high carbon steel was heat treated without and with a 12-T magnetic field. The microstructural features induced by magnetic field during its diffusion-controlled austenite decomposition were investigated by means of optical microscopy and SEM/EBSD. It is found that the magnetic field increases the amount of the abnormal structure, which is composed of proeutectoid cementite along the prior austenite boundaries and ferrite around it, because magnetic field increases the austenite grain size and promotes the Transformation of carbon-depleted austenite to ferrite. No specific orientation relationship between abnormal ferrite and cementite has been found in the non-field- or the field-treated specimens. Magnetic field evidently promotes the spheroidization of pearlite, due to its effect of enhancing carbon diffusion through raising the Transformation temperature and its effect of increasing the relative ferrite/cementite interface energy. As magnetic field favors the nucleation of the high magnetization phase-Pearlitic ferrite, the occurrence of the P-P2 OR that corresponds to the situation that ferrite nucleates prior to cementite during Pearlitic Transformation is enhanced by the magnetic field.
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new insights into crystallographic correlations between ferrite and cementite in lamellar eutectoid structures obtained by sem feg ebsd and an indirect two trace method
Journal of Applied Crystallography, 2007Co-Authors: Yikun Zhang, Claude Esling, Marion Calcagnotto, Xiang Zhao, Liang ZuoAbstract:Four different ferrite/cementite orientation relationships (ORs) in near-eutectoid steel are derived using SEM–FEG/EBSD (scanning electron microscopy–field emission gun/electron back-scatter diffraction) and an indirect two-trace method. They show a common feature of close-packed plane parallelism between ferrite and cementite. Their crystallographic compatibility with habit planes shows a variety of possible habit planes and excludes the existence of the exact conventional Bagaryatsky and Pitsch–Petch ORs. Each of these new ferrite/cementite ORs is correlated with a different edge-to-edge matching condition between austenite and Pearlitic ferrite, and between austenite and Pearlitic cementite, and possesses specific morphological features. The present results may give deep insight into the crystallography of Pearlitic Transformation and provide useful information for materials design through interface tailoring in steels.
Xiaoxue Zhang - One of the best experts on this subject based on the ideXlab platform.
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magnetic field induced microstructural features in a high carbon steel during diffusional phase Transformation
Journal of Magnetism and Magnetic Materials, 2012Co-Authors: Claude Esling, Xiang Zhao, Xiaoxue Zhang, Yudong Zhang, Minglong Gong, Liang ZuoAbstract:In this work, a high purity, high carbon steel was heat treated without and with a 12-T magnetic field. The microstructural features induced by magnetic field during its diffusion-controlled austenite decomposition were investigated by means of optical microscopy and SEM/EBSD. It is found that the magnetic field increases the amount of the abnormal structure, which is composed of proeutectoid cementite along the prior austenite boundaries and ferrite around it, because magnetic field increases the austenite grain size and promotes the Transformation of carbon-depleted austenite to ferrite. No specific orientation relationship between abnormal ferrite and cementite has been found in the non-field- or the field-treated specimens. Magnetic field evidently promotes the spheroidization of pearlite, due to its effect of enhancing carbon diffusion through raising the Transformation temperature and its effect of increasing the relative ferrite/cementite interface energy. As magnetic field favors the nucleation of the high magnetization phase-Pearlitic ferrite, the occurrence of the P-P2 OR that corresponds to the situation that ferrite nucleates prior to cementite during Pearlitic Transformation is enhanced by the magnetic field.
Yongning Liu - One of the best experts on this subject based on the ideXlab platform.
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ultrafine grain effect on Pearlitic Transformation in hypereutectoid steel
Journal of Materials Research, 2013Co-Authors: Fuliang Lian, Hong Ji Liu, Jun Jie Sun, Xue Jiao Sun, Sheng Wu Guo, Yongning LiuAbstract:Pearlitic Transformation in an ultrafine-grained (UFG) hypereutectoid steel was investigated. The steel was a plain carbon steel containing 1.0 wt% C and very few other elements. The UFG samples were prepared by thermomechanical treatment, and an average grain size of approximately 1 μm was achieved. The Pearlitic Transformation was conducted by heating the UFG samples at 1023 K for different times and then cooling in air. A new Pearlitic Transformation phenomenon was observed: traditional lamellar pearlite can be observed only when the grain size increases to a dimension larger than approximately 4 μm, which is a critical value. When grain size is smaller than this value, the Pearlitic Transformation occurs in the form of divorced eutectoid, and the microstructure is the ferrite matrix with granular cementite. This research indicates that grain size has a great influence on Pearlitic Transformation by shortening the diffusion distance and increasing the diffusion rate of carbon atoms in the UFG steel.