{"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\/pt\/slag-inclusions\/","title":{"rendered":"Inclus\u00f5es de esc\u00f3ria"},"content":{"rendered":"

A esc\u00f3ria misturada ao lingote ou outras impurezas n\u00e3o met\u00e1licas que se incorporam ao lingote s\u00e3o chamadas de inclus\u00f5es n\u00e3o met\u00e1licas. As caracter\u00edsticas de fratura s\u00e3o faixas ou escamas pretas, e as caracter\u00edsticas da microestrutura consistem principalmente em tecidos desordenados pretos, lineares, maci\u00e7os e floculentos, com diferen\u00e7a de cor evidente em rela\u00e7\u00e3o \u00e0 matriz. As inclus\u00f5es n\u00e3o met\u00e1licas s\u00e3o uma causa importante de delamina\u00e7\u00e3o e de muitos defeitos superficiais em produtos processados de alum\u00ednio. No tratamento t\u00e9rmico e no processo de aquecimento, a presen\u00e7a de inclus\u00f5es n\u00e3o met\u00e1licas pode favorecer a forma\u00e7\u00e3o de subporosidade e bolhas. Em termos de propriedades mec\u00e2nicas, as inclus\u00f5es n\u00e3o met\u00e1licas s\u00e3o pontos de concentra\u00e7\u00e3o de tens\u00e3o, o que reduz o limite de resist\u00eancia e o alongamento da liga. Em particular, a redu\u00e7\u00e3o no alongamento transversal e nas propriedades mec\u00e2nicas din\u00e2micas (resist\u00eancia ao impacto \u03c6, resist\u00eancia \u00e0 fadiga e tenacidade \u00e0 fratura) \u00e9 mais grave. Al\u00e9m disso, as inclus\u00f5es n\u00e3o met\u00e1licas reduzem a resist\u00eancia \u00e0 corros\u00e3o sob tens\u00e3o da liga.<\/p>\n

Inclus\u00f5es n\u00e3o met\u00e1licas (inclus\u00f5es de esc\u00f3ria) geralmente podem ser detectadas durante a inspe\u00e7\u00e3o da amostra transversal do lingote, sob baixa amplia\u00e7\u00e3o. Para todos os produtos de liga, n\u00e3o deve haver mais do que duas inclus\u00f5es de esc\u00f3ria na amostra do lingote, e a \u00e1rea de cada uma deve ser inferior a 0,5 mm\u00b2, caso contr\u00e1rio, o lingote ser\u00e1 rejeitado. As inclus\u00f5es n\u00e3o met\u00e1licas (inclus\u00f5es de esc\u00f3ria) s\u00e3o os res\u00edduos mais frequentes em lingotes de liga de alum\u00ednio. De acordo com estat\u00edsticas, calculadas com base na qualidade, os lingotes descartados devido a inclus\u00f5es de esc\u00f3ria representam de 10% a 25% do total de res\u00edduos.<\/p>\n

As inclus\u00f5es de esc\u00f3ria s\u00e3o geralmente causadas por esc\u00f3ria, fragmentos do revestimento e \u00f3xidos de maior tamanho que caem no lingote junto com o metal l\u00edquido durante o processo de fundi\u00e7\u00e3o.<\/p>\n

\"Inclus\u00f5es<\/p>\n

Como evitar a inclus\u00e3o de esc\u00f3ria<\/strong><\/p>\n

1) Refinar cuidadosamente, respeitando o tempo de repouso, e filtrar com tela de vidro na placa de fluxo ou no funil.
\n2) Encurtar o lavagem por transfer\u00eancia<\/a> Aumente a dist\u00e2ncia tanto quanto poss\u00edvel, estabele\u00e7a boas condi\u00e7\u00f5es de transfer\u00eancia e feche todas as quedas expostas no canal de vazamento, na placa de fluxo e no funil para evitar flutua\u00e7\u00f5es no n\u00edvel do metal l\u00edquido. \u00c9 recomend\u00e1vel utilizar a mesma cota de vazamento, sempre que poss\u00edvel.
\n3) Asse bem as ferramentas de transfer\u00eancia, aumente a temperatura de fundi\u00e7\u00e3o de forma adequada, remova cuidadosamente a esc\u00f3ria durante o processo de fundi\u00e7\u00e3o e trate com cuidado a bandeja do forno e outras ferramentas ap\u00f3s a fundi\u00e7\u00e3o.
\n4) Use carga limpa.<\/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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