{"id":77827,"date":"2018-03-09T23:23:25","date_gmt":"2018-03-09T23:23:25","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/comportamiento-mecanico-y-evolucion-microestructural-por-inversion-de-la-deformacion-en-caliente-de-aceros-en-fase-austenita\/"},"modified":"2018-03-09T23:23:25","modified_gmt":"2018-03-09T23:23:25","slug":"comportamiento-mecanico-y-evolucion-microestructural-por-inversion-de-la-deformacion-en-caliente-de-aceros-en-fase-austenita","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/propiedades-de-materiales\/comportamiento-mecanico-y-evolucion-microestructural-por-inversion-de-la-deformacion-en-caliente-de-aceros-en-fase-austenita\/","title":{"rendered":"Comportamiento mec\u00e1nico y evoluci\u00f3n microestructural por inversi\u00f3n de la deformaci\u00f3n en caliente de aceros en fase austenita"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jorge Badiola Denis <\/strong><\/h2>\n<p>Titulo: comportamiento mec\u00e1nico y evoluci\u00f3n microestructural por inversi\u00f3n de la deformaci\u00f3n en caliente de aceros en fase austenita  resumen: durante la laminaci\u00f3n en caliente de planchones de acero, cada zona de los mismos experimenta cambios significativos en temperatura, velocidad de deformaci\u00f3n y sentido de deformaci\u00f3n, desde que entra en contacto con los rodillos de laminaci\u00f3n hasta que sale. Se ha demostrado que estas condiciones variables pueden tener importantes efectos sobre la microestructura del material, asi como sobre el comportamiento mec\u00e1nico del mismo. Por lo tanto, 1 omisi\u00f3n de la variabilidad de estas magnitudes supone una fuente de error significativa en todo intento de modelado de la evoluci\u00f3n microestructural din\u00e1mica (durante el proceso de deformaci\u00f3n) y est\u00e1tica (entre las diferentes pasadas de laminaci\u00f3n), al mismo tiempo que del modelado del comportamiento mec\u00e1nico. Este hecho ha generado la necesidad por un lado, de tener una mayor y mejor comprensi\u00f3n de las relaciones entre los cambios de estas variables (causa) y sus efectos, y por el otro, la necesidad de proponer modelos matem\u00e1ticos que predigan tales relaciones. El trabajo expuesto en esta memoria se ha centrado en el efecto de la inversi\u00f3n de la deformaci\u00f3n a altas temperaturas sobre los aceros en fase austenita. Para estudiar este efecto, el trabajo se ha basado en la realizaci\u00f3n de ensayos de torsi\u00f3n en caliente a trav\u00e9s de los cuales se ha podido analizar: el efecto de las diferentes variables de deformaci\u00f3n sobre la respuesta mec\u00e1nica en caliente, a\u00f1adiendo el efecto de la inversi\u00f3n como nueva variable. En este punto, se ha abordado el modelado de las curvas de fluencia bajo condiciones constantes de deformaci\u00f3n como con cambios de sentido de carga. La evoluci\u00f3n microestructural de la austenita deformada bajo condiciones mon\u00f3tonas y de inversi\u00f3n, se ha utilizado la t\u00e9cnica de difracci\u00f3n de electrones retrodispersados (ebsd), con su aplicaci\u00f3n a la microscop\u00eda de im\u00e1genes por orientaci\u00f3n oim, para la caracterizaci\u00f3n de las diferentes microestructuras de deformaci\u00f3n en caliente obtenidas en un acero inoxidable austen\u00edtico 304. Esta caracterizaci\u00f3n se ha realizado atendiendo a criterios de desorientaci\u00f3n cristalogr\u00e1fica a diferentes escalas. El efecto de la inversi\u00f3n de la deformaci\u00f3n sobre las cin\u00e9ticas de ablandamiento, adem\u00e1s del efecto sobre la precipitaci\u00f3n inducida por deformaci\u00f3n en el caso del acero microaleado con nb. En este punto, se ha prestado atenci\u00f3n especial a la relaci\u00f3n entre los resultados experimentales y los modelos existentes para el estudio de las cin\u00e9ticas anteriores. Parte de este trabajo se ha desarrollado dentro de un proyecto europeo financiado por la ceca (n\u00c2\u00b0 7210.Pr\/291) y titulado \u00abconstitutive modelling for complex loading in metal forming processes , entre los a\u00f1os 2001-2004. during hot f\u00edat rolling of steel slabs, every material volume undergoes non- negligible temperature, strain rate and deformation direction changes. These changes take place from the moment the materials contacts the rolls until it exits. It has been shown that these variable conditions can affect significantly the material microstructure and the mechanical behaviour as well. Consequently, as long as these variations are not considered, any proposed model for both static and dynamic microstructural evolution and mechanical behaviour during rolling will contain important error sources. Obviously, on one hand, a better and wider understanding of the relationship between changing process variables and their effects is required. On the other hand, predictive models should not overlook those changing conditions. The present work is focused on the hot strain reversal effect on steels in austenite phase. In order to analyze its effect, hot torsion tests have been performed. These tests have allowed to study: \u00c2\u00bf the effect of the different deformation conditions on the hot mechanical response, adding the strain reversal as a new variable. At this point, modelling of the stress-strain curve under monotonic and strain reversal conditions has been tackled. \u00c2\u00bf microstructural evolution of the deformed austenite under monotonic and strain reversal conditions. Ebsd (electron backscattered diffraction) technique has been used for the microstructural characterization of the hot deformed substructure in a 304 austenitic stainless steel by means of its application to imaging orientation microscopy (oim). This characterization has been carried out regarding crystallographic criteria at different length scales. \u00c2\u00bf the effect of the strain reversal on the softening kinetics and on the strain induced precipitation in the nb microalloyed steel case. Special attention has been paid to the relationship between experimental results and current models for the kinetics mentioned before. The present work was partly developed within a european project entitled \u00abconstitutive modelling for complex loading in metal forming processes\u00bb financiany supported by ecsc (n 7210.Pr\/291), from 2001 to 2004<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Comportamiento mec\u00e1nico y evoluci\u00f3n microestructural por inversi\u00f3n de la deformaci\u00f3n en caliente de aceros en fase austenita<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Comportamiento mec\u00e1nico y evoluci\u00f3n microestructural por inversi\u00f3n de la deformaci\u00f3n en caliente de aceros en fase austenita <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jorge Badiola Denis <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Navarra<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 15\/12\/2005<\/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: javier Gil sevillano <\/li>\n<li>Ana isabel Fernandez calvo (vocal)<\/li>\n<li>Jos\u00e9 Mar\u00eda Cabrera marrero (vocal)<\/li>\n<li>Ana Mar\u00eda Pinol juez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jorge Badiola Denis Titulo: comportamiento mec\u00e1nico y evoluci\u00f3n microestructural por inversi\u00f3n de la deformaci\u00f3n en caliente 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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[12152,1586,17749,1125,7060],"tags":[38792,167463,32251,17773,167462,53325],"class_list":["post-77827","post","type-post","status-publish","format-standard","hentry","category-cristalografia","category-metalurgia","category-navarra","category-propiedades-de-materiales","category-propiedades-mecanicas-de-los-solidos","tag-ana-isabel-fernandez-calvo","tag-ana-maria-pinol-juez","tag-isabel-gutierrez-sanz","tag-javier-gil-sevillano","tag-jorge-badiola-denis","tag-jose-maria-cabrera-marrero"],"_links":{"self":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/77827","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/comments?post=77827"}],"version-history":[{"count":0,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/77827\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/media?parent=77827"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/categories?post=77827"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/tags?post=77827"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}