{"id":4579,"date":"2020-09-09T03:11:17","date_gmt":"2020-09-09T03:11:17","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4579"},"modified":"2020-09-09T03:11:17","modified_gmt":"2020-09-09T03:11:17","slug":"sr-modification","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/sr-modification\/","title":{"rendered":"Modificaci\u00f3n Sr"},"content":{"rendered":"

El principal problema de la modificaci\u00f3n con Sr es la tendencia creciente a la formaci\u00f3n de microporos en la aleaci\u00f3n. Los efectos de filtraci\u00f3n en estado fundido<\/a> Se estudi\u00f3 el efecto del modificador de estroncio (Sr) sobre la porosidad. El efecto significativo de la filtraci\u00f3n de la masa fundida en la reducci\u00f3n de la porosidad de la masa fundida modificada con Sr radica en que el contenido de inclusiones de la masa fundida modificada con Sr es mayor que el de la masa fundida no modificada. Con el fin de comprender los tipos de inclusiones presentes en las fundiciones de A356 modificadas con Sr que dan lugar a la formaci\u00f3n de poros, se han estudiado las muestras mediante microscop\u00eda electr\u00f3nica de barrido. Se ha observado que el tiempo de exposici\u00f3n de las fundiciones en atm\u00f3sfera oxidante influye en el comportamiento de oxidaci\u00f3n y en el tipo de inclusiones de Sr modificado<\/a> se derrite.<\/p>\n

Cuando el material fundido no se mantiene en la atm\u00f3sfera oxidante durante mucho tiempo, la pel\u00edcula de al\u00famina y las part\u00edculas desempe\u00f1an un papel importante, mientras que los \u00f3xidos que contienen SR no participan en la formaci\u00f3n de poros. Durante un tiempo de mantenimiento relativamente corto, la capa de \u00f3xido superficial de la aleaci\u00f3n A356 fundida est\u00e1 compuesta por Al\u2082O\u2083 y MgO, pero no se detecta ning\u00fan SRO. Sin embargo, se ha encontrado el compuesto intermet\u00e1lico Al-Si-Sr, y se sugiere que este desempe\u00f1a un papel en la formaci\u00f3n de poros. Cuando la masa fundida se mantiene en una atm\u00f3sfera oxidante durante un tiempo prolongado, m\u00e1s del 50% de la capa de \u00f3xido superficial est\u00e1 compuesta por espinela que contiene SrO.<\/p>\n

\"Modificaci\u00f3n<\/p>\n

Se ha estudiado el efecto de la modificaci\u00f3n con Sr sobre la formaci\u00f3n de poros en condiciones de presi\u00f3n reducida y a presi\u00f3n atmosf\u00e9rica. Se ha observado que el modificador Sr no tiene un efecto significativo sobre la formaci\u00f3n de poros en las muestras convencionales de copas de acero de pared delgada. Se ha dise\u00f1ado un nuevo tipo de copa met\u00e1lica con conducto de subida para su uso como molde en ensayos de descompresi\u00f3n. Est\u00e1 dise\u00f1ada para mejorar la solidificaci\u00f3n direccional, de modo que no se produzca contracci\u00f3n macrosc\u00f3pica en la muestra de ensayo. Se estudi\u00f3 el efecto del modificador de estroncio sobre la formaci\u00f3n de poros utilizando dicho molde. En condiciones de descompresi\u00f3n y a presi\u00f3n atmosf\u00e9rica, el efecto de la modificaci\u00f3n con Sr sobre el aumento de la densidad num\u00e9rica de poros y la fracci\u00f3n volum\u00e9trica de poros resulta significativo. Adem\u00e1s, los resultados muestran que el efecto del agente modificador Sr sobre la formaci\u00f3n de poros no es evidente en la masa fundida con un contenido de hidr\u00f3geno inferior a 0,1 cc\/100 g de Al.<\/p>","protected":false},"excerpt":{"rendered":"

The main problem of Sr modification is the increasing tendency of micropore formation in the alloy. The effects of melt filtration and Sr modifier on…<\/p>","protected":false},"author":1,"featured_media":4594,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4663,4664],"class_list":["post-4579","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-sr-modification","tag-sr-modifier"],"yoast_head":"\nSr Modification Effect Study on the Pore Formation in Melt Filtration<\/title>\n<meta name=\"description\" content=\"It is found that Sr Modification has no significant effect on the pore formation in the conventional thin-walled steel cup samples.\" \/>\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\/es\/sr-modification\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" 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