{"id":4991,"date":"2020-09-24T06:04:24","date_gmt":"2020-09-24T06:04:24","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4991"},"modified":"2020-09-24T06:04:24","modified_gmt":"2020-09-24T06:04:24","slug":"carbon-gray-streak","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/carbon-gray-streak\/","title":{"rendered":"Listra cinza-carv\u00e3o"},"content":{"rendered":"

A estriamento cinza-carbono \u00e9 um tipo de fen\u00f4meno de segrega\u00e7\u00e3o superficial, resultante da diferen\u00e7a na deforma\u00e7\u00e3o e na plasticidade das partes segregadas ap\u00f3s a lamina\u00e7\u00e3o. As estrias na superf\u00edcie est\u00e3o dispostas de maneira regular, e o padr\u00e3o fica preto ap\u00f3s ser corro\u00eddo por \u00e1cido de alta concentra\u00e7\u00e3o, sem altera\u00e7\u00f5es evidentes na estrutura granular. Esse tipo de estria costuma aparecer na produ\u00e7\u00e3o de ligas, e a maioria delas se encontra na superf\u00edcie inferior e nas bordas da tira.<\/p>\n

Principal motivo para a forma\u00e7\u00e3o de listras cinzas de carbono<\/strong><\/p>\n

(1) A cavidade l\u00edquida se torna mais profunda quando a zona de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o \u00e9 muito longa. A placa n\u00e3o \u00e9 f\u00e1cil de moldar logo ap\u00f3s sair da cavidade, e \u00e9 submetida \u00e0 for\u00e7a de lamina\u00e7\u00e3o, o que gera uma for\u00e7a de cisalhamento. A temperatura da camada de metal rec\u00e9m-cristalizada na zona de deforma\u00e7\u00e3o interna \u00e9 relativamente alta, e n\u00e3o h\u00e1 resist\u00eancia atr\u00e1s da cavidade l\u00edquida. Quando a for\u00e7a de cisalhamento excede a do metal solidificado rigidamente, e quando a resist\u00eancia ao cisalhamento \u00e9 alta, a zona intergranular de baixa resist\u00eancia \u00e9 facilmente separada, deformada e produz deslizamento posterior. A liga com alto teor de componentes flui primeiro e preenche o espa\u00e7o, formando, em cada caso, uma grande quantidade de estrutura eut\u00e9tica, o que causa segrega\u00e7\u00e3o.<\/p>\n

(2) Devido \u00e0 natureza da liga, o intervalo de cristaliza\u00e7\u00e3o \u00e9 amplo e a densidade \u00e9 elevada, sendo prov\u00e1vel que ocorra segrega\u00e7\u00e3o por densidade na superf\u00edcie inferior da pe\u00e7a em bruto.<\/p>\n

(3) A diferen\u00e7a entre o bocal de fundi\u00e7\u00e3o<\/a> e, como o rolo \u00e9 grande, o raio de tens\u00e3o superficial do alum\u00ednio fundido \u00e9 grande, e a resist\u00eancia \u00e0s varia\u00e7\u00f5es de press\u00e3o \u00e9 reduzida; na \u00e1rea da fase l\u00edquida, o alum\u00ednio fundido est\u00e1 sujeito \u00e0 oxida\u00e7\u00e3o quando entra em contato com o ar. \u00c0 medida que a espessura do \u00f3xido aumenta, isso inevitavelmente afeta a estabilidade do fluxo do alum\u00ednio l\u00edquido.<\/p>\n

(4) Ocasionalmente, surge um pequeno n\u00famero de pe\u00e7as em bruto de alum\u00ednio puro devido \u00e0s varia\u00e7\u00f5es no di\u00e2metro do rolo, na temperatura do rolo e na concentra\u00e7\u00e3o do jato de chama.<\/p>\n

\"Listra<\/p>\n

Medidas para o tratamento de manchas cinza-carbono<\/strong><\/p>\n

(1) Certifique-se de que o bico de fundi\u00e7\u00e3o esteja alinhado com a placa vertical e ajuste a posi\u00e7\u00e3o relativa entre o bico de fundi\u00e7\u00e3o e o rolo, a velocidade da tira de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o, o comprimento da zona de fundi\u00e7\u00e3o-lamina\u00e7\u00e3o e a temperatura da \u00e1gua de resfriamento, al\u00e9m de outros par\u00e2metros do processo.<\/p>\n

(2) Controlar a temperatura da superf\u00edcie do rolo, a dist\u00e2ncia entre o bico de fundi\u00e7\u00e3o e o rolo e a profundidade da cavidade do l\u00edquido durante o processo de produ\u00e7\u00e3o; al\u00e9m disso, manter a dist\u00e2ncia entre o bico de fundi\u00e7\u00e3o e o rolo dentro da faixa de 0,2 a 0,3 mm, levando em conta o balan\u00e7o do rolo, a deforma\u00e7\u00e3o do rolo e a deforma\u00e7\u00e3o t\u00e9rmica do bico de fundi\u00e7\u00e3o, e ajustar o tamanho do jato de chama de forma adequada.<\/p>\n

(3) Se necess\u00e1rio, utilize o m\u00e9todo de quebra da tira para romper a pel\u00edcula de \u00f3xido na parte frontal do bico de fundi\u00e7\u00e3o e eliminar as listras cinzas de carbono. O processamento com correia quebrada apresenta certos riscos. \u00c9 necess\u00e1rio que o n\u00edvel de l\u00edquido da calha e da caixa frontal seja o mais baixo poss\u00edvel e consistente, e que a velocidade m\u00ednima do laminador seja controlada de forma adequada para que haja efeitos evidentes.<\/p>","protected":false},"excerpt":{"rendered":"

Carbon gray streak is a kind of surface segregation phenomenon, the difference in deformation and plasticity of segregated parts after rolling. The stripes on the…<\/p>","protected":false},"author":1,"featured_media":5023,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4991","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nCarbon Gray Streak Treatment in Aluminum Casting and Rolling<\/title>\n<meta name=\"description\" content=\"Carbon gray streak is a kind of surface segregation phenomenon, the difference in deformation and plasticity of segregated parts.\" \/>\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\/carbon-gray-streak\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Carbon Gray Streak Treatment 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