{"id":5040,"date":"2020-09-24T09:06:33","date_gmt":"2020-09-24T09:06:33","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5040"},"modified":"2020-09-24T09:06:33","modified_gmt":"2020-09-24T09:06:33","slug":"inclusions-in-aluminum-melt","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/inclusions-in-aluminum-melt\/","title":{"rendered":"Inclusions dans la masse d'aluminium fondu"},"content":{"rendered":"<p>Les inclusions pr\u00e9sentes dans la masse d'aluminium en fusion, \u00e9galement appel\u00e9es \u00ab particules de seconde phase \u00bb, peuvent \u00eatre class\u00e9es en inclusions primaires et inclusions secondaires en fonction de leur origine. Les inclusions r\u00e9sultant de la composition des mati\u00e8res premi\u00e8res, du rev\u00eatement du four, des mat\u00e9riaux des canaux de coul\u00e9e et des moules, ainsi que des gaz du four, sont appel\u00e9es \u00ab inclusions primaires \u00bb ; celles r\u00e9sultant de l'affinage et de l'affinage du grain sont quant \u00e0 elles des \u00ab inclusions secondaires \u00bb.<\/p>\n<p><strong>Cat\u00e9gories d'inclusions dans la fonte d'aluminium<\/strong><\/p>\n<p>1) Inclusions solides non m\u00e9talliques, comprenant principalement des oxydes, des carbures, des nitrures et une faible quantit\u00e9 de CasO\u2084cas, etc. Parmi celles-ci, les inclusions d\u2019oxyde telles que l\u2019Al\u2082O\u2083MgO et le Malo, pr\u00e9sentes sous forme de film et de granules, repr\u00e9sentent 80%. Ces inclusions ne pr\u00e9sentent pas de diff\u00e9rence notable par rapport \u00e0 la densit\u00e9 de la masse fondue. Elles poss\u00e8dent une grande surface sp\u00e9cifique, une forme irr\u00e9guli\u00e8re, et sont susceptibles d\u2019adsorber des gaz et de rester en suspension dans la masse fondue, ce qui rend leur \u00e9limination difficile. Parmi elles, la forme sous laquelle l\u2019alumine est pr\u00e9sente est la plus complexe, comprenant plus d\u2019une dizaine de types, notamment des formes amorphes, \u03b1-Al\u2082O\u2083, \u03b2-Al\u2082O\u2083, etc.Au cours du traitement de la masse fondue, la r\u00e9action thermite \u00e0 haute temp\u00e9rature forme facilement des inclusions granulaires d\u2019alumine, comprenant notamment des carbures et de l\u2019azote. Le film d\u2019oxyde d\u2019aluminium pr\u00e9sent \u00e0 la surface de la masse fondue p\u00e9n\u00e8tre dans celle-ci et forme des inclusions fragment\u00e9es. Les mat\u00e9riaux r\u00e9fractaires pr\u00e9sents \u00e0 la surface du four et des outils de fusion p\u00e9n\u00e8trent dans la masse fondue pour former des inclusions d\u2019oxydes telles que le SiO\u2082 et le Zr\u2082O.<\/p>\n<p>2) Les inclusions de compos\u00e9s interm\u00e9talliques sont principalement constitu\u00e9es de divers agr\u00e9gats de particules form\u00e9s au cours du processus d'alliage ou <a href=\"http:\/\/www.alalloycasting.com\/fr\/grain-refinement\/\">affinage du grain<\/a>. L'un de ces types est constitu\u00e9 de compos\u00e9s solides de m\u00e9taux lourds m\u00e9lang\u00e9s \u00e0 la masse fondue, souvent appel\u00e9s \u00ab scories \u00bb, parmi lesquels les compos\u00e9s interm\u00e9talliques riches en fer sont les plus courants. Tels que l\u2019a-alsfe Si, le \u03b2-Alsfesi, le b-Alesia, le (Femn)Sials, etc. : avant la solidification de la masse fondue, certaines inclusions de compos\u00e9s interm\u00e9talliques primaires, telles que le MnA, le FeAl\u2083, l\u2019A, le TA, etc. Les compos\u00e9s interm\u00e9talliques form\u00e9s lors de l\u2019affinage du grain ou du traitement de la masse fondue sont principalement des inclusions \u00e0 gros grains de forme lamellaire ou filiforme, telles que VB\u2082, AIB\u2082, TiB\u2082, etc.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5041\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Inclusions-in-Aluminum-Melt.jpg\" alt=\"Inclusions dans la masse d&#039;aluminium fondu\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Inclusions-in-Aluminum-Melt.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Inclusions-in-Aluminum-Melt-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>3) Les inclusions liquides (sels fondus), principalement des sels d'halog\u00e9nures de m\u00e9taux alcalins et alcalino-terreux produits lors de l'\u00e9lectrolyse ou de l'affinage de l'aluminium, tels que le chlorure de magn\u00e9sium, le fluorure de sodium, le fluorure de calcium, etc. Le fluorure g\u00e9n\u00e8re g\u00e9n\u00e9ralement du chlorure au cours du processus d'\u00e9lectrolyse de l'aluminium, mais il est principalement produit lors du processus d'affinage en fusion.<\/p>\n<p>La pr\u00e9sence d'une faible quantit\u00e9 d'inclusions fines dans la masse d'aluminium fondu peut r\u00e9duire le degr\u00e9 de sous-refroidissement cristallin et favoriser, dans une certaine mesure, la nucl\u00e9ation. Certaines particules peuvent \u00e9galement renforcer la deuxi\u00e8me phase de l\u2019alliage d\u2019aluminium, mais la plupart des inclusions n\u2019ont pour effet que de nuire \u00e0 la r\u00e9sistance \u00e0 la fatigue, \u00e0 la ductilit\u00e9, \u00e0 la plasticit\u00e9, \u00e0 la r\u00e9sistance \u00e0 la corrosion et aux propri\u00e9t\u00e9s d\u2019oxydation anodique des lingots ou des produits. La pr\u00e9sence d\u2019inclusions solides augmente la viscosit\u00e9 de l\u2019aluminium fondu, affecte la fluidit\u00e9 et les performances de coul\u00e9e de l\u2019alliage d\u2019aluminium, et entra\u00eene la formation de d\u00e9fauts de structure. Parall\u00e8lement, elle constitue un noyau d\u2019initiation des fissures, d\u00e9truit la continuit\u00e9 de la matrice, provoque une concentration de contraintes et d\u00e9t\u00e9riore les pi\u00e8ces. Les propri\u00e9t\u00e9s m\u00e9caniques du produit entra\u00eenent une d\u00e9faillance pr\u00e9matur\u00e9e de celui-ci. Les particules d\u2019inclusions sont \u00e9galement susceptibles de former des points durs, ce qui d\u00e9t\u00e9riore les performances d\u2019usinage et l\u2019\u00e9tat de surface de l\u2019alliage d\u2019aluminium, et augmente l\u2019usure des outils d\u2019usinage. Les inclusions liquides dans la masse fondue provoquent l\u2019accumulation de gouttelettes, ce qui se traduit par une mauvaise fluidit\u00e9 de la masse fondue, la formation d\u2019un canal de conduction, etc.<\/p>","protected":false},"excerpt":{"rendered":"<p>The inclusions in the aluminum melt, also known as the second phase particles, can be divided into primary inclusions and secondary inclusions according to their&hellip;<\/p>","protected":false},"author":1,"featured_media":5041,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5040","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>Inclusions in Aluminum Melt | Molten Aluminum Refining<\/title>\n<meta name=\"description\" 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