{"id":5940,"date":"2020-10-24T13:47:06","date_gmt":"2020-10-24T13:47:06","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5940"},"modified":"2020-10-24T13:47:06","modified_gmt":"2020-10-24T13:47:06","slug":"casting-grains","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/casting-grains\/","title":{"rendered":"Grains de fonderie"},"content":{"rendered":"<p>Une exigence importante concernant la structure du lingot est que son int\u00e9rieur soit compos\u00e9 de grains de coul\u00e9e sph\u00e9riques fins et uniformes. Pour diff\u00e9rents syst\u00e8mes d\u2019alliages, la formation de grains de coul\u00e9e fins r\u00e9duit la sensibilit\u00e9 aux fissures \u00e0 chaud et \u00e0 froid. De plus, la finesse des grains de coul\u00e9e influe \u00e9galement sur le comportement \u00e0 chaud du lingot, ainsi que sur la surface du produit extrud\u00e9 et son aspect apr\u00e8s traitement de surface. La structure de coul\u00e9e \u00e0 grains ouverts sph\u00e9riques est obtenue par un traitement d\u2019affinage des grains. La structure de l\u2019alliage est affin\u00e9e par l\u2019ajout de grains de type A1TiB. Cette m\u00e9thode consiste \u00e0 introduire un fil ALTIB dans le<a href=\"http:\/\/www.alalloycasting.com\/fr\/casting-launder-2\/\"> canal de coul\u00e9e<\/a> lors de la coul\u00e9e, puis se m\u00e9langent au m\u00e9tal en fusion, le TiB\u2082 \u2013 composant principal de l'alliage \u2013 se pr\u00e9sentant sous forme de particules fines. Pour diff\u00e9rentes compositions d'alliages d'aluminium, l'ajout d'AlTiB permet d'obtenir une granulom\u00e9trie suffisamment fine.<\/p>\n<p>La structure des pi\u00e8ces moul\u00e9es de la plupart des alliages d'aluminium pr\u00e9sente une structure allant des dendrites de maille \u00e9l\u00e9mentaire aux dendrites. Aux limites des grains coul\u00e9s et aux limites des dendrites des cellules, l\u2019eutectique form\u00e9 lors de la solidification contient des compos\u00e9s m\u00e9talliques dont la r\u00e9partition est lin\u00e9aire. La structure des grains et des dendrites des cellules \u00e9l\u00e9mentaires pr\u00e9sente \u00e9galement les caract\u00e9ristiques d\u2019une s\u00e9gr\u00e9gation intragranulaire, c\u2019est-\u00e0-dire que les \u00e9l\u00e9ments d\u2019alliage sont \u00e9galement r\u00e9partis de mani\u00e8re in\u00e9gale au sein de ces structures. La formation de cette s\u00e9gr\u00e9gation intragranulaire est due \u00e0 une solidification hors \u00e9quilibre, les \u00e9l\u00e9ments d'alliage se d\u00e9pla\u00e7ant du centre du grain vers la limite de grain. Cet enrichissement conduit \u00e0 la formation d'une phase eutectique \u00e0 bas point de fusion entre le noyau cristallin et la limite de la dendrite de la cellule unitaire.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5956\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/10\/Casting-Grains-1.jpg\" alt=\"Grains de fonderie\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Casting-Grains-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Casting-Grains-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>La structure dendritique des cellules du lingot est fine et homog\u00e8ne. Pour les produits extrud\u00e9s qui n\u00e9cessitent un traitement de surface et sont destin\u00e9s \u00e0 un usage d\u00e9coratif, les exigences en mati\u00e8re d'organisation sont particuli\u00e8rement importantes. Les variations de taille des dendrites cellulaires peuvent entra\u00eener l'apparition de stries \u00e0 la surface.<\/p>\n<p>La structure dendritique \u00e0 cellules unitaires du lingot d'alliage d'aluminium est visible sur toute la section transversale de ce profil unique. La couche externe du lingot pr\u00e9sente une structure dendritique \u00e0 cellules unitaires grossi\u00e8res, formant une coque externe dure. La zone suivante pr\u00e9sente une structure dendritique \u00e0 cellules unitaires tr\u00e8s fines. Plus on se rapproche du centre du lingot, plus la taille des dendrites \u00e0 cellule unitaire est importante, et c'est au centre du lingot qu'elle est la plus grande. Des \u00e9tudes ont montr\u00e9 que certains profils influenc\u00e9s par la taille des dendrites \u00e0 cellule unitaire d\u00e9pendent du diam\u00e8tre du lingot.<\/p>","protected":false},"excerpt":{"rendered":"<p>The important requirement of the ingot structure is that the inside is composed of fine and uniform spherical casting grains. For different alloy systems, the&hellip;<\/p>","protected":false},"author":1,"featured_media":5956,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5940","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Casting Grains for Aluminum Alloy Ingot Structure Requirement<\/title>\n<meta name=\"description\" content=\"The important requirement of the ingot structure is that the inside is composed of fine and uniform spherical casting grains.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/casting-grains\/\" \/>\n<meta property=\"og:locale\" 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