{"id":3990,"date":"2020-08-21T09:32:48","date_gmt":"2020-08-21T09:32:48","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3990"},"modified":"2020-08-21T09:32:48","modified_gmt":"2020-08-21T09:32:48","slug":"grain-refinement","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/grain-refinement\/","title":{"rendered":"Affinage du grain"},"content":{"rendered":"

L'affinage du grain est l'un des processus importants dans la fusion et la coul\u00e9e des alliages d'aluminium ; c'est \u00e9galement l'une des mesures les plus efficaces pour rem\u00e9dier aux d\u00e9fauts de coul\u00e9e tels que la porosit\u00e9, les grains grossiers et les fissures. Dans la coul\u00e9e d'alliages, il s'agit d'une cristallisation hors \u00e9quilibre. Tous les \u00e9l\u00e9ments d'impuret\u00e9 (y compris, bien s\u00fbr, les \u00e9l\u00e9ments d'alliage) se concentrent principalement aux joints de grains. Plus les grains sont petits, plus la surface des joints de grains est importante. Plus la surface des joints de grains est grande, plus la r\u00e9partition des \u00e9l\u00e9ments d'impuret\u00e9 (ou des \u00e9l\u00e9ments d'alliage) est homog\u00e8ne. Affinage par flux<\/a>, le d\u00e9gazage et la filtration en ligne permettent d'affiner le grain.<\/p>\n

En ce qui concerne les \u00e9l\u00e9ments d'impuret\u00e9, une grande uniformit\u00e9 permet d'en r\u00e9duire les effets n\u00e9fastes, voire de transformer les effets n\u00e9fastes d'une faible quantit\u00e9 d'\u00e9l\u00e9ments d'impuret\u00e9 en effets b\u00e9n\u00e9fiques. Quant aux \u00e9l\u00e9ments d'alliage, une grande uniformit\u00e9 permet de tirer davantage parti de leurs propri\u00e9t\u00e9s d'alliage et d'atteindre ainsi l'objectif d'une utilisation optimale des ressources.<\/p>\n

Dans la fabrication des alliages d'aluminium destin\u00e9s aux mat\u00e9riaux abrasifs, la r\u00e9partition homog\u00e8ne des \u00e9l\u00e9ments d'alliage et des impuret\u00e9s rev\u00eat une importance particuli\u00e8re, car le profil\u00e9 doit \u00eatre soumis \u00e0 une attaque chimique afin d'obtenir une surface de grain uniforme. Plus les grains sont fins, plus la r\u00e9partition des \u00e9l\u00e9ments d'alliage (et des impuret\u00e9s) est homog\u00e8ne, et plus la surface de grain obtenue apr\u00e8s attaque chimique est uniforme.<\/p>\n

Une temp\u00e9rature de coul\u00e9e ad\u00e9quate constitue \u00e9galement un facteur important dans la production de tiges en aluminium de haute qualit\u00e9. Une temp\u00e9rature trop basse peut facilement entra\u00eener des d\u00e9fauts de coul\u00e9e tels que des inclusions de scories et des aiguilles. Si la temp\u00e9rature est trop \u00e9lev\u00e9e, des d\u00e9fauts de coul\u00e9e tels qu\u2019un grain grossier et des cristaux en plumes sont susceptibles d\u2019appara\u00eetre.<\/p>\n

\"Affinage<\/p>\n

Une fois l'affinage de l'alliage d'aluminium fondu termin\u00e9, la temp\u00e9rature de coul\u00e9e peut \u00eatre augment\u00e9e de mani\u00e8re appropri\u00e9e et est g\u00e9n\u00e9ralement maintenue entre 720 et 740 degr\u00e9s. En effet, apr\u00e8s l'affinage du grain, l'aluminium fondu devient visqueux et se solidifie plus facilement.<\/p>\n

Lors du processus de coul\u00e9e, la tige d\u2019aluminium pr\u00e9sente une zone de transition biphasique liquide-solide au niveau du front de cristallisation. Une temp\u00e9rature de coul\u00e9e plus \u00e9lev\u00e9e entra\u00eene une zone de transition plus \u00e9troite. Cette zone de transition \u00e9troite favorise l\u2019\u00e9chappement des gaz lib\u00e9r\u00e9s par le front de cristallisation. Bien entendu, la temp\u00e9rature ne doit pas \u00eatre trop \u00e9lev\u00e9e, car une temp\u00e9rature de coul\u00e9e trop \u00e9lev\u00e9e r\u00e9duirait la dur\u00e9e d'action du raffinateur de grains et rendrait les grains relativement plus gros.<\/p>","protected":false},"excerpt":{"rendered":"

Grain refinement is one of the important processes in aluminum alloy melting and casting, and it is also one of the most effective measures to…<\/p>","protected":false},"author":1,"featured_media":3991,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4496],"class_list":["post-3990","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-grain-refinement"],"yoast_head":"\nGrain Refinement in aluminum alloy melting and casting<\/title>\n<meta name=\"description\" content=\"Grain refinement is one of the important processes, and it is also one of the most effective measures to solve aluminum casting defects.\" \/>\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\/grain-refinement\/\" \/>\n<meta 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