{"id":11131,"global_id":"fermi.univ-tlse3.fr\/fr\/home?id=11131","global_id_lineage":["fermi.univ-tlse3.fr\/fr\/home?id=11131"],"author":"5","status":"publish","date":"2024-11-07 16:18:06","date_utc":"2024-11-07 15:18:06","modified":"2024-11-14 09:55:04","modified_utc":"2024-11-14 08:55:04","url":"https:\/\/fermi.univ-tlse3.fr\/fr\/home\/event\/etude-de-la-localisation-de-la-deformation-a-650c-et-de-son-impact-sur-la-rupture-intergranulaire-assistee-par-oxydation-cas-de-lalliage-718-malo-jullien-cemes-these-15-11-2024-1\/","rest_url":"https:\/\/fermi.univ-tlse3.fr\/fr\/home\/wp-json\/tribe\/events\/v1\/events\/11131","title":"\u00c9tude de la localisation de la d\u00e9formation \u00e0 650\u00b0C et de son impact sur la rupture intergranulaire assist\u00e9e par oxydation: cas de l&rsquo;Alliage 718. &#8211; (Malo JULLIEN \/ CEMES \/ These). &#8211; 15\/11\/2024, 14H00","description":"<p><span style=\"font-size: 20px; background-color: #f18500;\">Soutenance de th\u00e8se<\/span><\/p>\n<p><span style=\"font-size: 20px; color: #191970;\"><strong>Malo JULLIEN,<\/strong><\/span> CEMES, salle de conf\u00e9rence<\/p>\n<p><strong>Compositition du jury:<\/strong><\/p>\n<div class=\"\">\n<ul style=\"list-style-type: circle;\">\n<li><strong>M. Damien TEXIER :<\/strong> <a href=\"https:\/\/ica.cnrs.fr\/\" target=\"_blank\" rel=\"noopener\">Institut Cl\u00e9ment Ader &#8211; CNRS UMR 5312<\/a> &#8211; Directeur de th\u00e8se<\/li>\n<li><strong>M. Marc LEGROS<\/strong> : <a href=\"https:\/\/www.cemes.fr\/\" target=\"_blank\" rel=\"noopener\">CEMES &#8211; CNRS UPR 8011<\/a> &#8211; Co-directeur de th\u00e8se<\/li>\n<li><strong>M. Patrick VILLECHAISE :<\/strong> <a href=\"https:\/\/pprime.fr\/\" target=\"_blank\" rel=\"noopener\">Institut Pprime &#8211; CNRS UPR 3346<\/a> &#8211; Rapporteur<\/li>\n<li><strong>M. Xavier FEAUGAS :<\/strong> <a href=\"https:\/\/lasie.univ-larochelle.fr\/\" target=\"_blank\" rel=\"noopener\">Laboratoire des Sciences de l&rsquo;Ing\u00e9nieur pour l&rsquo;Environnement (LaSie) &#8211; UMR CNRS 7356<\/a> &#8211; Rapporteur<\/li>\n<li><strong>M. Xavier MAEDER :<\/strong> <a href=\"https:\/\/www.empa.ch\/\" target=\"_blank\" rel=\"noopener\">EMPA<\/a> &#8211; Examinateur<\/li>\n<li><strong>Mme Dominique POQUILLON :<\/strong> <a href=\"https:\/\/https:\/\/cirimat.fr\/\" target=\"_blank\" rel=\"noopener\">CIRIMAT &#8211; UMR CNRS 5085<\/a> &#8211; Examinatrice<\/li>\n<li><strong>M. Guillaume KERMOUCHE :<\/strong> <a href=\"https:\/\/www.mines-stetienne.fr\/lgf\/\" target=\"_blank\" rel=\"noopener\">Laboratoire Georges Friedel &#8211; UMR CNRS 5307<\/a> &#8211; Examinateur<\/li>\n<\/ul>\n<\/div>\n<p><span style=\"font-size: 20px; color: #191970;\"><strong>R\u00e9sum\u00e9 : <\/strong><\/span><br \/>\nL\u2019Alliage 718 est un superalliage base nickel de r\u00e9f\u00e9rence, largement utilis\u00e9 dans la fabrication de composants structurels, parfois critiques, tels que les disques de turbine des turbor\u00e9acteurs. Cet alliage est connu pour fortement localiser la d\u00e9formation. Cette localisation peut \u00eatre responsable d\u2019un endommagement pr\u00e9coce en service. Pour le secteur a\u00e9ronautique, les contraintes \u00e9cologiques imposent une augmentation des temp\u00e9ratures de service. Il est alors essentiel d\u2019identifier le r\u00f4le que joue le paysage de d\u00e9formation \u00e0 l\u2019\u00e9chelle de la microstructure sur l\u2019endommagement assist\u00e9 ou non par l\u2019oxydation \u00e0 ces temp\u00e9ratures. L\u2019objectif premier de cette th\u00e8se est de comprendre comment la microstructure et les vitesses de chargement m\u00e9canique affectent le paysage de d\u00e9formation \u00e0 haute temp\u00e9rature. Le second est de lier ce paysage de d\u00e9formation au comportement m\u00e9canique et aux caract\u00e9ristiques de rupture observ\u00e9es lors d\u2019essais de tractions \u00e0 650\u00b0C. Les travaux exp\u00e9rimentaux pr\u00e9sent\u00e9s dans ce manuscrit reposent principalement sur la technique de corr\u00e9lation d\u2019images num\u00e9riques haute r\u00e9solution qui permet de capter la r\u00e9ponse m\u00e9canique locale de la microstructure sur des r\u00e9gions statistiquement repr\u00e9sentatives de la microstructure; en opposition \u00e0 des techniques microm\u00e9caniques plus locales. Ces travaux ont permis de montrer qu\u2019\u00e0 650\u00b0C dans l\u2019Alliage 718, la d\u00e9formation est r\u00e9partie entre les joints de grains et des bandes de glissement \u00e0 l\u2019int\u00e9rieur des grains. Cette r\u00e9partition d\u00e9pend \u00e0 la fois de la sollicitation m\u00e9canique et de la microstructure. Une taille de grains grossi\u00e8re favorise le glissement intragranulaire alors qu\u2019une microstructure plus fine favorise la localisation de la d\u00e9formation aux joints de grains. De m\u00eame, en traction \u00e0 faible vitesse de d\u00e9formation, la localisation aux joints de grains est privil\u00e9gi\u00e9e alors qu\u2019\u00e0 plus haute vitesse de d\u00e9formation et lorsque le ph\u00e9nom\u00e8ne de Portevin-Le-Chatelier a lieu, le glissement intragranulaire est majoritaire. Lors d\u2019essais de traction sous air \u00e0 650\u00b0C, seule la localisation aux joints de grains entraine un abattement cons\u00e9quent de la ductilit\u00e9. Cependant, plus que l\u2019activit\u00e9 plastique des joints de grains, il est montr\u00e9 que c&rsquo;est la r\u00e9partition des \u00e9v\u00e9nements et leurs interactions qui sont responsables de la rupture intergranulaire assist\u00e9e par oxydation et la perte de ductilit\u00e9 associ\u00e9e. Cette approche microm\u00e9canique associ\u00e9e \u00e0 l\u2019endommagement local de la mati\u00e8re am\u00e8ne un regard nouveau et int\u00e9ressant sur le couplage oxydation-m\u00e9canique op\u00e9rant \u00e0 l\u2019\u00e9chelle de la microstructure dans cet alliage.<\/p>\n<hr \/>\n<p><div class=\"leaflet-map WPLeafletMap\" style=\"height:300px; width:70%;\"><\/div><script>\nwindow.WPLeafletMapPlugin = window.WPLeafletMapPlugin || [];\nwindow.WPLeafletMapPlugin.push(function WPLeafletMapShortcode() {\/*<script>*\/\nvar baseUrl = atob('aHR0cHM6Ly97c30udGlsZS5vcGVuc3RyZWV0bWFwLm9yZy97en0ve3h9L3t5fS5wbmc=');\nvar base = (!baseUrl && window.MQ) ?\n    window.MQ.mapLayer() : L.tileLayer(baseUrl,\n        L.Util.extend({}, {\n            detectRetina: 0,\n        },\n        {\"subdomains\":\"abc\",\"noWrap\":false,\"maxZoom\":18}        )\n    );\n    var options = L.Util.extend({}, {\n        layers: [base],\n        attributionControl: false\n    },\n    {\"zoomControl\":true,\"scrollWheelZoom\":true,\"doubleClickZoom\":true,\"fitBounds\":true,\"minZoom\":9,\"maxZoom\":18,\"maxBounds\":null,\"attribution\":\"<a href=\\\"http:\\\/\\\/leafletjs.com\\\" title=\\\"Une biblioth\\u00e8que JS pour des cartes interactives\\\">Leaflet<\\\/a>; 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