{"id":5934,"date":"2020-10-24T14:01:45","date_gmt":"2020-10-24T14:01:45","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5934"},"modified":"2021-02-20T02:27:58","modified_gmt":"2021-02-20T02:27:58","slug":"slag-inclusions","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/slag-inclusions\/","title":{"rendered":"Inclusions de scories"},"content":{"rendered":"

Les scories m\u00e9lang\u00e9es au lingot ou autres impuret\u00e9s non m\u00e9talliques qui s\u2019y introduisent sont appel\u00e9es \u00ab inclusions non m\u00e9talliques \u00bb. Au niveau de la rupture, elles se pr\u00e9sentent sous forme de bandes ou de lamelles noires ; au niveau de la microstructure, elles se caract\u00e9risent principalement par des tissus d\u00e9sordonn\u00e9s noirs, lin\u00e9aires, massifs et floconneux, pr\u00e9sentant une diff\u00e9rence de couleur marqu\u00e9e par rapport \u00e0 la matrice. Les inclusions non m\u00e9talliques constituent une cause importante de d\u00e9lamination et de nombreux d\u00e9fauts de surface dans les produits transform\u00e9s en aluminium. Lors des processus de traitement thermique et de chauffage, la pr\u00e9sence d\u2019inclusions non m\u00e9talliques peut favoriser la formation de sous-porosit\u00e9s et de bulles. En termes de propri\u00e9t\u00e9s m\u00e9caniques, les inclusions non m\u00e9talliques constituent des points de concentration des contraintes, ce qui r\u00e9duit la limite de r\u00e9sistance et l\u2019allongement de l\u2019alliage. En particulier, la diminution de l\u2019allongement transversal et des propri\u00e9t\u00e9s m\u00e9caniques dynamiques (r\u00e9sistance au choc \u03c6, r\u00e9sistance \u00e0 la fatigue et t\u00e9nacit\u00e9 \u00e0 la rupture) est plus marqu\u00e9e. De plus, les inclusions non m\u00e9talliques r\u00e9duisent la r\u00e9sistance \u00e0 la corrosion sous contrainte de l\u2019alliage.<\/p>\n

Les inclusions non m\u00e9talliques (inclusions de scories) peuvent g\u00e9n\u00e9ralement \u00eatre d\u00e9tect\u00e9es lors de l'inspection de l'\u00e9chantillon transversal \u00e0 faible grossissement du lingot. Pour tous les produits en alliage, le sp\u00e9cimen de lingot ne doit pas comporter plus de deux inclusions de scories, dont la surface unitaire est inf\u00e9rieure \u00e0 0,5 mm\u00b2, faute de quoi il sera rejet\u00e9. Les inclusions non m\u00e9talliques (inclusions de scories) constituent les d\u00e9chets les plus fr\u00e9quents dans les lingots d\u2019alliage d\u2019aluminium. Selon les statistiques, en termes de qualit\u00e9, les lingots mis au rebut en raison d\u2019inclusions de scories repr\u00e9sentent entre 10% et 25% du total des d\u00e9chets.<\/p>\n

Les inclusions de scories sont g\u00e9n\u00e9ralement dues \u00e0 la pr\u00e9sence de scories, de fragments de rev\u00eatement et d'oxydes de plus grande taille qui p\u00e9n\u00e8trent dans le lingot en m\u00eame temps que le m\u00e9tal en fusion au cours du processus de coul\u00e9e.<\/p>\n

\"Inclusions<\/p>\n

Comment \u00e9viter les inclusions de scories<\/strong><\/p>\n

1) Affiner soigneusement, respecter le temps de repos, puis filtrer \u00e0 l'aide d'une mousseline de verre dans une plaque d'\u00e9coulement ou un entonnoir.
\n2) Raccourcir le tunnel de lavage<\/a> R\u00e9duire autant que possible la distance, mettre en place de bonnes conditions de transfert, obturer toutes les chutes expos\u00e9es dans la goulotte, la plaque d'\u00e9coulement et l'entonnoir afin d'\u00e9viter les fluctuations du niveau du m\u00e9tal en fusion. Il est pr\u00e9f\u00e9rable d'utiliser, dans la mesure du possible, une coul\u00e9e de m\u00eame niveau.
\n3) Cuire soigneusement les outils de transfert, augmenter la temp\u00e9rature de coul\u00e9e de mani\u00e8re appropri\u00e9e, \u00e9liminer soigneusement les scories pendant le processus de coul\u00e9e et entretenir avec soin le bac du four et les autres outils apr\u00e8s la coul\u00e9e.
\n4) Utilisez une charge propre.<\/p>","protected":false},"excerpt":{"rendered":"

The slag mixed into the ingot or other non-metallic impurities falling into the ingot are called non-metallic inclusions. The fracture features are black strips or…<\/p>","protected":false},"author":1,"featured_media":5962,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5934","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nSlag Inclusions in Aluminum Alloy Ingot Casting Process<\/title>\n<meta name=\"description\" content=\"The slag mixed into the ingot or impurities falling into the ingot are called salg inclusions. 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