{"id":3990,"date":"2020-08-21T09:32:48","date_gmt":"2020-08-21T09:32:48","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3990"},"modified":"2020-08-21T09:32:48","modified_gmt":"2020-08-21T09:32:48","slug":"grain-refinement","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/grain-refinement\/","title":{"rendered":"Refinamento do gr\u00e3o"},"content":{"rendered":"

O refinamento do gr\u00e3o \u00e9 um dos processos importantes na fus\u00e3o e fundi\u00e7\u00e3o de ligas de alum\u00ednio, al\u00e9m de ser uma das medidas mais eficazes para resolver defeitos de fundi\u00e7\u00e3o, como porosidade, gr\u00e3os grosseiros e trincas. Na fundi\u00e7\u00e3o de ligas, trata-se de uma cristaliza\u00e7\u00e3o fora do equil\u00edbrio. Todos os elementos de impureza (incluindo, \u00e9 claro, os elementos de liga) concentram-se principalmente nos limites dos gr\u00e3os. Quanto menores os gr\u00e3os, maior a \u00e1rea dos limites dos gr\u00e3os. Quanto menores os gr\u00e3os, maior a uniformidade dos elementos de impureza (ou elementos de liga). Refinamento por fluxo<\/a>, a desgaseifica\u00e7\u00e3o e a filtragem em linha podem proporcionar o refinamento do gr\u00e3o.<\/p>\n

No caso dos elementos impuros, uma alta uniformidade pode reduzir seus efeitos nocivos e at\u00e9 mesmo transformar os efeitos nocivos de uma pequena quantidade desses elementos em efeitos ben\u00e9ficos. No que diz respeito aos elementos de liga, a alta uniformidade permite que eles exer\u00e7am propriedades de liga mais eficazes e contribua para o objetivo de aproveitar ao m\u00e1ximo os recursos.<\/p>\n

Na produ\u00e7\u00e3o de ligas de alum\u00ednio destinadas a materiais abrasivos, a distribui\u00e7\u00e3o uniforme dos elementos de liga e das impurezas \u00e9 particularmente importante, pois o perfil precisa ser submetido \u00e0 corros\u00e3o para se obter uma superf\u00edcie de areia uniforme. Quanto mais finos forem os gr\u00e3os, mais uniforme ser\u00e1 a distribui\u00e7\u00e3o dos elementos de liga (impurezas) e, consequentemente, mais uniforme ser\u00e1 a superf\u00edcie de areia ap\u00f3s a corros\u00e3o.<\/p>\n

A temperatura adequada de fundi\u00e7\u00e3o tamb\u00e9m \u00e9 um fator importante na produ\u00e7\u00e3o de barras de alum\u00ednio de alta qualidade. Uma temperatura muito baixa pode facilmente causar defeitos de fundi\u00e7\u00e3o, como inclus\u00f5es de esc\u00f3ria e agulhas. Se a temperatura for muito alta, \u00e9 prov\u00e1vel que ocorram defeitos de fundi\u00e7\u00e3o, como gr\u00e3os grosseiros e cristais em forma de penas.<\/p>\n

\"Refinamento<\/p>\n

Ap\u00f3s o refinamento da liga de alum\u00ednio fundida, a temperatura de fundi\u00e7\u00e3o pode ser aumentada adequadamente e, geralmente, pode ser mantida entre 720 e 740 graus. Isso ocorre porque o alum\u00ednio fundido se torna viscoso e solidifica mais facilmente ap\u00f3s o refinamento do gr\u00e3o.<\/p>\n

No processo de fundi\u00e7\u00e3o, a barra de alum\u00ednio apresenta uma zona de transi\u00e7\u00e3o bif\u00e1sica l\u00edquido-s\u00f3lido na frente de cristaliza\u00e7\u00e3o. Uma temperatura de fundi\u00e7\u00e3o mais elevada resulta em uma zona de transi\u00e7\u00e3o mais estreita. Essa zona de transi\u00e7\u00e3o estreita favorece a sa\u00edda do g\u00e1s liberado pela frente de cristaliza\u00e7\u00e3o. \u00c9 claro que a temperatura n\u00e3o deve ser muito alta, pois uma temperatura de fundi\u00e7\u00e3o excessivamente elevada reduzir\u00e1 o tempo efetivo de a\u00e7\u00e3o do refinador de gr\u00e3os e tornar\u00e1 os gr\u00e3os relativamente maiores.<\/p>","protected":false},"excerpt":{"rendered":"

Grain refinement is one of the important processes in aluminum alloy melting and casting, and it is also one of the most effective measures to…<\/p>","protected":false},"author":1,"featured_media":3991,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4496],"class_list":["post-3990","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-grain-refinement"],"yoast_head":"\nGrain Refinement in aluminum alloy melting and casting<\/title>\n<meta name=\"description\" content=\"Grain refinement is one of the important processes, and it is also one of the most effective measures to solve aluminum casting defects.\" \/>\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\/grain-refinement\/\" \/>\n<meta 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