{"id":2969,"date":"2020-07-21T09:57:54","date_gmt":"2020-07-21T09:57:54","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2969"},"modified":"2020-10-19T05:29:13","modified_gmt":"2020-10-19T05:29:13","slug":"cast-aluminum-alloy","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/cast-aluminum-alloy\/","title":{"rendered":"Alliage d'aluminium moul\u00e9"},"content":{"rendered":"

Depuis longtemps, les alliages d'aluminium moul\u00e9s sont largement utilis\u00e9s dans l'industrie en raison de leur faible co\u00fbt, de leur l\u00e9g\u00e8ret\u00e9 et de leurs performances fiables. En particulier, face \u00e0 la demande croissante de mat\u00e9riaux l\u00e9gers pour le transport ferroviaire ces derni\u00e8res ann\u00e9es, l\u2019alliage d\u2019aluminium A356, qui est l\u2019alliage d\u2019aluminium moul\u00e9 le plus r\u00e9pandu, pr\u00e9sente une bonne fluidit\u00e9 de coul\u00e9e, une bonne \u00e9tanch\u00e9it\u00e9 \u00e0 l\u2019air, un faible retrait et une faible tendance \u00e0 la fissuration \u00e0 chaud. Apr\u00e8s modification et traitement thermique, il pr\u00e9sente de bonnes propri\u00e9t\u00e9s m\u00e9caniques, physiques et de r\u00e9sistance \u00e0 la corrosion, ainsi que de bonnes aptitudes \u00e0 l\u2019usinage, comparables \u00e0 celles des moyeux de roue en acier. Par rapport \u00e0 ces derniers, les moyeux de roue en alliage d\u2019aluminium offrent les avantages de la l\u00e9g\u00e8ret\u00e9, de la s\u00e9curit\u00e9, du confort et des \u00e9conomies d\u2019\u00e9nergie, et sont largement utilis\u00e9s dans les secteurs de l\u2019automobile et de l\u2019a\u00e9ronautique.<\/p>\n

Cependant, en raison de son retrait de solidification et de la facilit\u00e9 avec laquelle l'hydrog\u00e8ne se dissout \u00e0 l'\u00e9tat fondu, l'alliage d'aluminium moul\u00e9 contient in\u00e9vitablement un certain nombre de d\u00e9fauts, tels que des vides, des oxydes et des inclusions non m\u00e9talliques. Ces d\u00e9fauts ont un impact consid\u00e9rable sur les propri\u00e9t\u00e9s m\u00e9caniques des composants : par exemple, les vides repr\u00e9sentant une fraction volumique de 1% entra\u00eeneront une fatigue de 50% et une r\u00e9duction de la limite de fatigue de 20%. Il est donc essentiel d\u2019\u00e9tudier l\u2019influence de la nature, de la quantit\u00e9, de la taille et de la r\u00e9partition des d\u00e9fauts sur les propri\u00e9t\u00e9s m\u00e9caniques.<\/p>\n

\"Alliage<\/p>\n

Analyse des d\u00e9fauts dans les alliages d'aluminium moul\u00e9s<\/h2>\n

L'analyse des d\u00e9fauts de rupture constitue un moyen important d'\u00e9tudier le m\u00e9canisme de rupture des alliages d'aluminium. Les d\u00e9fauts observ\u00e9s dans les \u00e9chantillons comprennent la porosit\u00e9 de retrait, les cavit\u00e9s de retrait, les piq\u00fbres, les inclusions non m\u00e9talliques et les inclusions de scories, ainsi que le film d'alumine. L'hydrog\u00e8ne et les impuret\u00e9s sont les principales causes de ces d\u00e9fauts. AdTech propose unit\u00e9 de d\u00e9gazage en ligne<\/a> pour l'\u00e9limination de l'hydrog\u00e8ne, et Unit\u00e9 de filtration CFF<\/a> pour \u00e9liminer les impuret\u00e9s.<\/p>\n

Pour r\u00e9duire la teneur en gaz de la masse fondue, par exemple en proc\u00e9dant \u00e0 un s\u00e9chage complet au four, agent de raffinage<\/a> et les outils n\u00e9cessaires pour assurer une cuisson compl\u00e8te, r\u00e9duire la teneur en eau des diff\u00e9rents mat\u00e9riaux, \u00e9viter que la masse fondue ne reste trop longtemps dans le four, emp\u00eacher sa surchauffe, etc.<\/p>\n

Afin de r\u00e9duire la taille de la zone de transition dans le lingot, il convient notamment d'utiliser un entonnoir adapt\u00e9 pour assurer un \u00e9coulement uniforme, d'augmenter de mani\u00e8re appropri\u00e9e la temp\u00e9rature de coul\u00e9e et de r\u00e9duire la vitesse de coul\u00e9e, d'augmenter de mani\u00e8re appropri\u00e9e la pression de l'eau pour am\u00e9liorer la r\u00e9sistance au refroidissement du lingot, et de r\u00e9duire de mani\u00e8re appropri\u00e9e la diff\u00e9rence de temp\u00e9rature.<\/p>","protected":false},"excerpt":{"rendered":"

For a long time, cast aluminum alloy has been widely used in industry because of its low price, lightweight, and reliable performance. In particular, with…<\/p>","protected":false},"author":1,"featured_media":5740,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[1704,1703],"class_list":["post-2969","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-billet-casting","tag-cast-aluminum-alloy-defect-analysis"],"yoast_head":"\nCast Aluminum Alloy Defect Analysis,Aluminum Billet Casting<\/title>\n<meta name=\"description\" content=\"For a long time, cast aluminum alloy has been widely used in industry because of its low price, lightweight, and reliable performance.\" \/>\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\/cast-aluminum-alloy\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" 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