{"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\/pt\/cast-aluminum-alloy\/","title":{"rendered":"Liga de alum\u00ednio fundido"},"content":{"rendered":"

H\u00e1 muito tempo, a liga de alum\u00ednio fundido tem sido amplamente utilizada na ind\u00fastria devido ao seu baixo pre\u00e7o, leveza e desempenho confi\u00e1vel. Em particular, com o aumento da demanda por materiais leves para o transporte ferrovi\u00e1rio nos \u00faltimos anos, a liga de alum\u00ednio A356, como a liga de alum\u00ednio fundido mais utilizada, apresenta boa fluidez na fundi\u00e7\u00e3o, boa estanqueidade, baixo encolhimento e baixa tend\u00eancia a fissuras a quente. Ap\u00f3s modifica\u00e7\u00e3o e tratamento t\u00e9rmico, ela apresenta boas propriedades mec\u00e2nicas, f\u00edsicas e de resist\u00eancia \u00e0 corros\u00e3o, al\u00e9m de boas propriedades de usinagem, semelhantes \u00e0s dos cubos de roda de a\u00e7o. Em compara\u00e7\u00e3o com estes, os cubos de roda de liga de alum\u00ednio oferecem vantagens como leveza, seguran\u00e7a, conforto e economia de energia, tendo sido amplamente utilizados nas ind\u00fastrias automotiva e aeron\u00e1utica.<\/p>\n

No entanto, devido \u00e0 contra\u00e7\u00e3o por solidifica\u00e7\u00e3o e \u00e0 facilidade de dissolu\u00e7\u00e3o do hidrog\u00eanio no estado fundido, a liga de alum\u00ednio fundida cont\u00e9m inevitavelmente um certo n\u00famero de defeitos, como vazios, \u00f3xidos e inclus\u00f5es n\u00e3o met\u00e1licas. Esses defeitos t\u00eam grande impacto nas propriedades mec\u00e2nicas dos componentes; por exemplo, vazios com fra\u00e7\u00e3o volum\u00e9trica de 1% levam \u00e0 fadiga 50% e \u00e0 redu\u00e7\u00e3o do limite de fadiga 20%. Portanto, \u00e9 de grande import\u00e2ncia estudar a influ\u00eancia da natureza, quantidade, tamanho e distribui\u00e7\u00e3o dos defeitos nas propriedades mec\u00e2nicas.<\/p>\n

\"Liga<\/p>\n

An\u00e1lise de defeitos em ligas de alum\u00ednio fundido<\/h2>\n

A an\u00e1lise de defeitos de fratura \u00e9 uma forma importante de analisar o mecanismo de fratura da liga de alum\u00ednio. Os defeitos observados nas amostras incluem porosidade de contra\u00e7\u00e3o, cavidades de contra\u00e7\u00e3o, poros min\u00fasculos, inclus\u00f5es n\u00e3o met\u00e1licas e de esc\u00f3ria, al\u00e9m de pel\u00edcula de alumina. O hidrog\u00eanio e as impurezas s\u00e3o as principais causas dos defeitos. A AdTech oferece unidade de desgaseifica\u00e7\u00e3o online<\/a> para a remo\u00e7\u00e3o de hidrog\u00eanio, e Unidade de filtragem CFF<\/a> para purificar as impurezas.<\/p>\n

Para reduzir o teor de g\u00e1s na massa fundida, como, por exemplo, por meio de uma secagem completa em forno, agente refinador<\/a> e as ferramentas necess\u00e1rias para realizar uma queima completa, reduzindo o teor de \u00e1gua de diversos materiais, evitando que a massa fundida permane\u00e7a por muito tempo no forno, impedindo o superaquecimento da massa fundida, etc.<\/p>\n

A fim de reduzir o tamanho da zona de transi\u00e7\u00e3o no lingote, medidas como utilizar o funil adequado para garantir um fluxo uniforme, aumentar adequadamente a temperatura de fundi\u00e7\u00e3o e diminuir a velocidade de fundi\u00e7\u00e3o, aumentar adequadamente a press\u00e3o da \u00e1gua para melhorar a resist\u00eancia ao resfriamento do lingote e reduzir adequadamente a diferen\u00e7a de temperatura.<\/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\/pt\/cast-aluminum-alloy\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" 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