{"id":59847,"date":"2007-10-07T00:00:00","date_gmt":"2007-10-07T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/efecto-de-la-composicion-quimica-sobre-las-cineticas-de-recristalizacion-y-crecimiento-de-grano-en-chapas-de-acero-de-bajo-carbono-laminadas-en-frio\/"},"modified":"2007-10-07T00:00:00","modified_gmt":"2007-10-07T00:00:00","slug":"efecto-de-la-composicion-quimica-sobre-las-cineticas-de-recristalizacion-y-crecimiento-de-grano-en-chapas-de-acero-de-bajo-carbono-laminadas-en-frio","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/metalurgia\/efecto-de-la-composicion-quimica-sobre-las-cineticas-de-recristalizacion-y-crecimiento-de-grano-en-chapas-de-acero-de-bajo-carbono-laminadas-en-frio\/","title":{"rendered":"Efecto de la composicion quimica sobre las cineticas de recristalizacion y crecimiento de grano en chapas de acero de bajo carbono laminadas en frio"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Maite Oyarzabal Retegui <\/strong><\/h2>\n<p>Titulo: efecto de la composici\u00f3n qu\u00edmica sobre las cin\u00e9ticas de recristalizacion y crecimiento de grano en chapas de acero de bajo carbono laminadas en fri\u00f3 #resumen: el objetivo principal del presente trabajo de investigaci\u00f3n ha consistido en la obtenci\u00f3n de un modelo de recristalizaci\u00f3n, basado en par\u00e1metros f\u00edsicos, que sea capaz de predecir la evoluci\u00f3n microestructural de aceros de bajo carbono teniendo en cuenta el efecto de la composici\u00f3n qu\u00edmica. El modelo propuesto representa la cin\u00e9tica de recristalizaci\u00f3n en t\u00e9rminos de dos par\u00e1metros importantes: el n\u00famero de n\u00facleos por unidad de volumen y la velocidad de migraci\u00f3n del frente de recristalizaci\u00f3n. Adem\u00e1s las velocidades de migraci\u00f3n del frente obtenidas experimentalmente se han modelizado en funci\u00f3n de la composici\u00f3n qu\u00edmica debido al efecto que ejercen diferentes elementos en soluci\u00f3n sobre la movilidad de las juntas de grano. Con el fin de investigar los efectos de diferentes elementos en soluci\u00f3n y la influencia del porcentaje de reducci\u00f3n en fr\u00edo sobre la velocidad de migraci\u00f3n, y consecuentemente, sobre las cin\u00e9ticas de recristalizaci\u00f3n, se han estudiado chapas de aceros extra bajos en carbono con diferente composici\u00f3n qu\u00edmica y con altos porcentajes de reducci\u00f3n en fr\u00edo. Para ello se han realizado recocidos isotermos a diferentes temperaturas. La caracterizaci\u00f3n de las muestras se ha llevado a cabo mediante diversas t\u00e9cnicas experimentales. Se han empleado medidas de dureza para analizar el ablandamiento mec\u00e1nico durante el recocido y se ha analizado la evoluci\u00f3n microestructural, que est\u00e1 descrita por la fracci\u00f3n recristalizada, tama\u00f1o de grano, n\u00famero de granos por unidad de \u00e1rea, \u00e1rea por unidad de volumen de las intercaras entre zonas recristal izadas y deformadas, y las velocidades de migraci\u00f3n del frente de recristalizaci\u00f3n. La t\u00e9cnica de difracci\u00f3n de electrones retrodispersados (ebsd) y la microscop\u00eda de im\u00e1genes por orientaci\u00f3n (oim) se han empleado para estudiar la microtextura y obtener detalles espec\u00edficos de la microestructura de algunos estados de recristalizaci\u00f3n.  Se ha observado que la velocidad de migraci\u00f3n del frente de recristalizaci\u00f3n disminuye a lo largo de la recristalizaci\u00f3n. Se ha analizado la contribuci\u00f3n de la restauraci\u00f3n y de la heterogeneidad de la energ\u00eda almacenada en el material a este fen\u00f3meno. Para ello se ha contado con la ayuda de t\u00e9cnicas de ensayos no destructivos (end) de medidas magn\u00e9ticas. En el presente trabajo tambi\u00e9n se ha estudiado la api icabi1 i dad de las t\u00e9cnicas magn\u00e9ticas y se han discutido las condiciones bajo las cuales las medidas de campo coercitivo se pueden utilizar para monitorizar la evoluci\u00f3n de la fracci\u00f3n recristalizada. the main objective of the present research study has been directed towards obtaining a recrystallization model, based on physical parameters, capable of predicting the microstructural evolution of low carbon steels taking into account the effect of the chemical composition. The proposed model represents the recrystallization kinetics in terms of two important parameters: the number of nuclei per unit volume and the migration rate of the recrystallization front. Additionally, the migration rates obtained experimental!Y have been modelled as a function of the chemical composition due to the effect that different elements in solid solution exert on the mobility of the grain boundaries. With the aim of researching the effects of different elements in solution and the influence of the percentage of cold reduction on the migration rate, and consequently, on recrystallization kinetics, extra low carb\u00f3n steel sheets with different chemical composition and high grades of cold reduction have been studied. Isothermal annealing treatments at different temperatures have been performed. The characterization of the samples has been carried out by means of several experimental techniques. Hardness measurements have been employed to analyze the mechanical softening during annealing and microstructural evolution has been examined in terms of recrystallized fraction, grain size, number of grains per unit \u00e1rea, \u00e1rea per unit volume of the interface between recrystallized and deformed zones, and the migration rate of the recrystallization front. Electron backscattered diffraction (ebsd) and orientation imaging microscopy (oim) have been employed to study the microtexture and to obtain specific details of the microstructure of some of the recrystallization states. It has been observed that the migration rate decreases during recrystallization. The contribution of recovery and the heterogeneity of the stored energy to this phenomenon have been analyzed. For this study the aid of non destructive techniques (ndt) using magnetic measurements has been helpful. Within the present work, the applicability of the magnetic techniques has al so been studied and the conditions under which the measurements of the coercive field can be used to monitor the evolution of the recrystallized fraction have been discussed<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Efecto de la composicion quimica sobre las cineticas de recristalizacion y crecimiento de grano en chapas de acero de bajo carbono laminadas en frio<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Efecto de la composicion quimica sobre las cineticas de recristalizacion y crecimiento de grano en chapas de acero de bajo carbono laminadas en frio <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Maite Oyarzabal Retegui <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Navarra<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 10\/07\/2007<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Isabel Gutierrez Sanz<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jos\u00e9 manuel Martinez esnaola <\/li>\n<li>m. del mar Petite del villar (vocal)<\/li>\n<li>Francisco Javier Belzunce varela (vocal)<\/li>\n<li>Carlos Garc\u00eda de andres (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Maite Oyarzabal Retegui Titulo: efecto de la composici\u00f3n qu\u00edmica sobre las cin\u00e9ticas de recristalizacion y crecimiento de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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