{"id":1082,"date":"2019-12-18T09:11:04","date_gmt":"2019-12-18T06:11:04","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=1082"},"modified":"2020-11-02T09:42:24","modified_gmt":"2020-11-02T06:42:24","slug":"starenie-metalla","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/pt\/envelhecimento-do-metal\/","title":{"rendered":"Envelhecimento do metal, tipos, artificial, natural, como acontece e do que depende"},"content":{"rendered":"<p><strong>Envelhecimento de metais <\/strong>um processo bastante lento que resulta em mudan\u00e7as mec\u00e2nicas e altera\u00e7\u00f5es nas propriedades f\u00edsicas e qu\u00edmicas.<\/p>\n<p>Sobre <strong>envelhecimento de metais <\/strong>\u00e9 influenciado por uma s\u00e9rie de fatores, incluindo:<\/p>\n<ul>\n<li>movimento t\u00e9rmico de \u00e1tomos e mol\u00e9culas;<\/li>\n<li>impacto mec\u00e2nico (v\u00e1rias cargas de flex\u00e3o\/compress\u00e3o\/rasgo, etc.);<\/li>\n<li>radia\u00e7\u00e3o luminosa (especialmente radia\u00e7\u00e3o invis\u00edvel aos humanos);<\/li>\n<li>campo magn\u00e9tico (magnetiza\u00e7\u00e3o\/desmagnetiza\u00e7\u00e3o), etc.<\/li>\n<\/ul>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>A ess\u00eancia do envelhecimento do metal \u00e9 atingir um estado de equil\u00edbrio, durante o qual as propriedades do metal se desviam do normal. Especificamente, o material pode se tornar mais macio, quebradi\u00e7o, menos el\u00e1stico, etc.<\/p>\n<h2>Tipos de envelhecimento de metais<\/h2>\n<blockquote><p>\u00c9 feita uma distin\u00e7\u00e3o entre envelhecimento natural e artificial.<\/p><\/blockquote>\n<p>O envelhecimento artificial do metal consiste na r\u00e1pida aquisi\u00e7\u00e3o da composi\u00e7\u00e3o e das propriedades desejadas. O envelhecimento artificial \u00e9 obtido por meio de tratamento t\u00e9rmico e deforma\u00e7\u00e3o pl\u00e1stica. Por exemplo, na produ\u00e7\u00e3o de duralum\u00ednio, ele \u00e9 envelhecido artificialmente por v\u00e1rias horas.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1086 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-foto.webp\" alt=\"foto do envelhecimento do metal\" width=\"400\" height=\"258\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-foto.webp 400w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-foto-300x194.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-foto-254x164.webp 254w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>O envelhecimento natural ocorre naturalmente e n\u00e3o requer condi\u00e7\u00f5es adicionais. No entanto, o processo \u00e9 mais intenso, com per\u00edodos mais longos e temperaturas pr\u00f3ximas a 20 \u00b0C.<\/p>\n<h3>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/h3>\n<h3>Aplica\u00e7\u00e3o de processos de envelhecimento em metalurgia e metalurgia<\/h3>\n<p>O envelhecimento, como tratamento adicional, \u00e9 utilizado como etapa final. \u00c9 aplicado a certos metais e ligas nos quais uma solu\u00e7\u00e3o s\u00f3lida supersaturada pode precipitar componentes em excesso e se decompor espontaneamente ao longo do tempo. Este m\u00e9todo \u00e9 particularmente \u00fatil na prepara\u00e7\u00e3o de materiais para a produ\u00e7\u00e3o de componentes e pe\u00e7as individuais para os quais o processo descrito acima \u00e9 cr\u00edtico.<\/p>\n<blockquote><p>Ap\u00f3s o envelhecimento, a dureza e a resist\u00eancia do metal aumentam, mas sua viscosidade e ductilidade diminuem. No entanto, \u00e9 importante observar que esses valores se mant\u00eam durante toda a vida \u00fatil do material.<\/p><\/blockquote>\n<p>O envelhecimento do a\u00e7o \u00e9 realizado para alterar a estrutura interna e \u00e9 aplicado ap\u00f3s a t\u00eampera. A solu\u00e7\u00e3o s\u00f3lida de ferrita resultante, saturada com nitrog\u00eanio e carbono, se decomp\u00f5e com o aquecimento. Dependendo do volume de inclus\u00f5es de carbono no material &quot;envelhecido&quot;, a estrutura interna assume as seguintes formas:<\/p>\n<ul>\n<li>c\u00fabico;<\/li>\n<li>esf\u00e9rico;<\/li>\n<li>em forma de disco (em forma de placas finas);<\/li>\n<li>em forma de agulha.<\/li>\n<\/ul>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>O tratamento t\u00e9rmico (envelhecimento artificial do metal) \u00e9 aplicado a ligas nas quais a solubilidade de um elemento no estado s\u00f3lido \u00e9 significativamente reduzida. Essa propriedade se torna mais pronunciada \u00e0 medida que a temperatura diminui.<\/p>\n<p>Em a\u00e7os com baixo teor de carbono, n\u00e3o superior a 0,05%, o envelhecimento artificial causa a decomposi\u00e7\u00e3o da solu\u00e7\u00e3o alfa s\u00f3lida supersaturada. Como resultado, o excesso de fases precipita. Ap\u00f3s esse tratamento, a ductilidade diminui, mas a dureza e a resist\u00eancia aumentam significativamente. Essas s\u00e3o precisamente as qualidades frequentemente exigidas no produto metal\u00fargico final.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1083 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-\u041c\u043e\u0434\u0435\u043b\u044c-\u041e\u0440\u043e\u0432\u0430\u043d\u0430.webp\" alt=\"Modelo de Orowan\" width=\"290\" height=\"227\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-\u041c\u043e\u0434\u0435\u043b\u044c-\u041e\u0440\u043e\u0432\u0430\u043d\u0430.webp 290w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-\u041c\u043e\u0434\u0435\u043b\u044c-\u041e\u0440\u043e\u0432\u0430\u043d\u0430-243x190.webp 243w\" sizes=\"auto, (max-width: 290px) 100vw, 290px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Modelo de Orowan<\/em><\/p>\n<p>A figura mostra o modelo de Orowan, que ilustra claramente o movimento de discord\u00e2ncia. O efeito m\u00e1ximo pode ser alcan\u00e7ado atrav\u00e9s do envelhecimento natural. No entanto, isso requer um tempo consider\u00e1vel, o que n\u00e3o \u00e9 econ\u00f4mico nem pr\u00e1tico para uma produ\u00e7\u00e3o cont\u00ednua e em grande escala (n\u00e3o \u00e9 como decantar vinho ou conhaque em barris). Portanto, existem m\u00e9todos artificiais para acelerar esses processos naturais (\u00e9 uma pena que n\u00e3o se possa fazer o mesmo com o u\u00edsque). No entanto, vale ressaltar que o envelhecimento artificial reduzir\u00e1 significativamente as propriedades de resist\u00eancia do material.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1084 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-\u0422\u0432\u0435\u0440\u0434\u043e\u0441\u0442\u044c-\u0432-\u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438-\u043e\u0442-\u0432\u0440\u0435\u043c\u0435\u043d\u0438-\u0441\u0442\u0430\u0440\u0435\u043d\u0438\u044f.webp\" alt=\"Dureza dependendo do tempo de envelhecimento\" width=\"270\" height=\"295\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-\u0422\u0432\u0435\u0440\u0434\u043e\u0441\u0442\u044c-\u0432-\u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438-\u043e\u0442-\u0432\u0440\u0435\u043c\u0435\u043d\u0438-\u0441\u0442\u0430\u0440\u0435\u043d\u0438\u044f.webp 270w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-\u0422\u0432\u0435\u0440\u0434\u043e\u0441\u0442\u044c-\u0432-\u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438-\u043e\u0442-\u0432\u0440\u0435\u043c\u0435\u043d\u0438-\u0441\u0442\u0430\u0440\u0435\u043d\u0438\u044f-174x190.webp 174w\" sizes=\"auto, (max-width: 270px) 100vw, 270px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Dureza dependendo do tempo de envelhecimento<\/em><\/p>\n<p>O gr\u00e1fico mostrado demonstra claramente o problema descrito acima: reduzir o tempo de envelhecimento do metal n\u00e3o aumenta suas caracter\u00edsticas de resist\u00eancia.<\/p>\n<p>O processo de envelhecimento depende em grande parte de carbono e nitrog\u00eanio. Isso \u00e9 especialmente percept\u00edvel em a\u00e7os de baixo carbono. O nitrog\u00eanio se dissolve menos facilmente no ferro alfa \u00e0 medida que a temperatura diminui. Por exemplo, a 590 \u00b0C, o teor de nitrog\u00eanio dissolvido \u00e9 de 0,1%, mas a 20 \u00b0C, seu teor cai para 0,004%. Durante o envelhecimento, a solu\u00e7\u00e3o alfa libera nitretos. Portanto, o efeito do nitrog\u00eanio \u00e9 menos pronunciado do que o do carbono sob influ\u00eancias t\u00e9rmicas.<\/p>\n\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t\n<p>\u00c0 medida que o teor de carbono do a\u00e7o aumenta, as altera\u00e7\u00f5es estruturais produzidas pelo tratamento t\u00e9rmico aumentam. A quantidade m\u00e1xima de carbono que pode ser dissolvida no ferro alfa \u00e9 de 0,02 a 0,04%. Com esse teor, um produto temperado submetido ao envelhecimento natural apresenta uma dureza uma vez e meia maior do que ap\u00f3s o recozimento.<\/p>\n<blockquote><p>O envelhecimento \u00e9 o principal m\u00e9todo para aumentar a resist\u00eancia de ligas resistentes ao calor (ligas com alto teor de n\u00edquel). Este grupo tamb\u00e9m inclui ligas \u00e0 base de alum\u00ednio, cobre e magn\u00e9sio. Al\u00e9m disso, a estrutura alterada desses metais e ligas confere coercividade.<\/p><\/blockquote>\n<p>O alum\u00ednio e as ligas de alum\u00ednio-cobre sofrem degrada\u00e7\u00e3o em diferentes temperaturas (acima de 100 \u00b0C) devido \u00e0s diferen\u00e7as nas temperaturas de decomposi\u00e7\u00e3o estrutural dos diferentes metais. Assim, \u00e9 feita uma distin\u00e7\u00e3o entre decomposi\u00e7\u00e3o estrutural em baixa e alta temperatura.<\/p>\n<p>A decomposi\u00e7\u00e3o de uma solu\u00e7\u00e3o s\u00f3lida ocorre de duas maneiras. No primeiro caso, a forma\u00e7\u00e3o e o crescimento das part\u00edculas de fase ocorrem em todo o volume. No segundo caso, a decomposi\u00e7\u00e3o \u00e9 descont\u00ednua (celular). Durante esse processo, as c\u00e9lulas crescem em col\u00f4nias. As col\u00f4nias t\u00eam uma estrutura celular, e o crescimento ocorre a partir do contorno de gr\u00e3o e se move para dentro, diminuindo de tamanho.<\/p>\n<h3>Envelhecimento mec\u00e2nico e t\u00e9rmico<\/h3>\n<p>Existem dois tipos de envelhecimento de metais: t\u00e9rmico e mec\u00e2nico. Vamos analisar cada um com mais detalhes.<\/p>\n<h3>Envelhecimento t\u00e9rmico<\/h3>\n<p>A fase que fortalece o metal durante o tratamento t\u00e9rmico ocorre em seu ponto m\u00e1ximo. \u00c9 aqui que ocorre a fase de solu\u00e7\u00e3o metaest\u00e1vel, na zona de Guinier-Preston. Esse tipo de fortalecimento de metais e ligas \u00e9 comumente chamado de refor\u00e7o por dispers\u00e3o.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1085 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-\u0417\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u044c-\u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u0438-\u043e\u0442-\u0432\u0440\u0435\u043c\u0435\u043d\u0438-\u0438-\u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u044b-\u0441\u0442\u0430\u0440\u0435\u043d\u0438\u044f.webp\" alt=\"Depend\u00eancia da resist\u00eancia em rela\u00e7\u00e3o ao tempo e \u00e0 temperatura de envelhecimento\" width=\"388\" height=\"249\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-\u0417\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u044c-\u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u0438-\u043e\u0442-\u0432\u0440\u0435\u043c\u0435\u043d\u0438-\u0438-\u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u044b-\u0441\u0442\u0430\u0440\u0435\u043d\u0438\u044f.webp 388w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-\u0417\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u044c-\u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u0438-\u043e\u0442-\u0432\u0440\u0435\u043c\u0435\u043d\u0438-\u0438-\u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u044b-\u0441\u0442\u0430\u0440\u0435\u043d\u0438\u044f-300x193.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2019\/12\/starenie-metalla-\u0417\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u044c-\u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u0438-\u043e\u0442-\u0432\u0440\u0435\u043c\u0435\u043d\u0438-\u0438-\u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u044b-\u0441\u0442\u0430\u0440\u0435\u043d\u0438\u044f-254x163.webp 254w\" sizes=\"auto, (max-width: 388px) 100vw, 388px\" \/><\/p>\n<p style=\"text-align: center;\"><em>Depend\u00eancia da resist\u00eancia em rela\u00e7\u00e3o ao tempo e \u00e0 temperatura de envelhecimento<\/em><\/p>\n<p>Com uma exposi\u00e7\u00e3o mais longa, inicia-se o envelhecimento excessivo, o que significa uma redu\u00e7\u00e3o nas caracter\u00edsticas de resist\u00eancia. Isso \u00e9 influenciado por:<\/p>\n<ul>\n<li>coagula\u00e7\u00e3o;<\/li>\n<li>substitui\u00e7\u00e3o parcial de part\u00edculas por outras incoerentes.<\/li>\n<\/ul>\n<p>Tipos de envelhecimento t\u00e9rmico do metal:<\/p>\n<ul>\n<li>Duas etapas: t\u00eampera, manuten\u00e7\u00e3o na temperatura de substitui\u00e7\u00e3o e, em seguida, manuten\u00e7\u00e3o em temperatura elevada para atingir a homogeneidade da solu\u00e7\u00e3o s\u00f3lida.<\/li>\n<li>T\u00eampera \u2013 t\u00eampera e uma etapa de espera com resfriamento natural.<\/li>\n<li>Natural - para ligas de alum\u00ednio.<\/li>\n<li>Artificial \u2013 para ligas de metais n\u00e3o ferrosos por aquecimento a uma temperatura superior \u00e0 usada para destrui\u00e7\u00e3o natural.<\/li>\n<li>Estabiliza\u00e7\u00e3o \u2013 alta temperatura de envelhecimento e longo per\u00edodo de reten\u00e7\u00e3o ajudam a manter as dimens\u00f5es e propriedades da pe\u00e7a.<\/li>\n<\/ul>\n<h3>Envelhecimento mec\u00e2nico do metal<\/h3>\n<p>A destrui\u00e7\u00e3o do a\u00e7o por for\u00e7as de deforma\u00e7\u00e3o ocorre na faixa de temperatura abaixo do processo de recristaliza\u00e7\u00e3o. Isso \u00e9 causado pela forma\u00e7\u00e3o e movimenta\u00e7\u00e3o de discord\u00e2ncias. A deforma\u00e7\u00e3o pl\u00e1stica a frio aumenta a densidade de discord\u00e2ncias, que aumenta ainda mais com o aumento das cargas.<\/p>\n<p>As altera\u00e7\u00f5es nas propriedades mec\u00e2nicas do metal fazem com que os \u00e1tomos de carbono e nitrog\u00eanio se movam em dire\u00e7\u00e3o \u00e0s discord\u00e2ncias localizadas na solu\u00e7\u00e3o alfa. Ao atingirem as discord\u00e2ncias, os \u00e1tomos formam nuvens (atmosferas de Cottrell). Esses aglomerados impedem o movimento das discord\u00e2ncias, resultando em uma altera\u00e7\u00e3o nas propriedades. As propriedades inerentes \u00e0s pe\u00e7as envelhecidas pelo calor se manifestam.<\/p>\n<p>Embora nitrog\u00eanio, n\u00edquel e cobre afetem significativamente o efeito do envelhecimento por deforma\u00e7\u00e3o, a adi\u00e7\u00e3o de van\u00e1dio, tit\u00e2nio e ni\u00f3bio elimina completamente esse efeito. Portanto, recomenda-se o uso de a\u00e7o com teor de alum\u00ednio de 0,02-0,07%.<\/p>\n<h4>Modos recomendados para envelhecimento<\/h4>\n<p>Tratamento t\u00e9rmico:<\/p>\n<ul>\n<li>para a\u00e7os com alto teor de carbono: temperatura de cerca de 130\u00b0C-150\u00b0C, tempo de espera de cerca de 25-30 horas;<\/li>\n<li>para ligas de metais n\u00e3o ferrosos: temperatura de cerca de 250\u00b0C, tempo de espera de cerca de 1 hora.<\/li>\n<\/ul>\n<p>Processamento de pl\u00e1stico:<\/p>\n<ul>\n<li>para um processo natural: temperatura de cerca de 20\u00b0C;<\/li>\n<li>para fluxo de processo artificial: temperatura de cerca de 250\u00b0C, tempo de espera de cerca de 1 hora.<\/li>\n<\/ul>\n<p>A temperatura de aquecimento e o tempo de reten\u00e7\u00e3o s\u00e3o selecionados individualmente para cada grau de metal e liga, dependendo de sua composi\u00e7\u00e3o.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>O envelhecimento dos metais \u00e9 um processo bastante lento, que resulta em altera\u00e7\u00f5es mec\u00e2nicas, altera\u00e7\u00f5es f\u00edsicas e\u2026<\/p>","protected":false},"author":1,"featured_media":1086,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1082","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-metody-obrabotki"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0432\u0438\u0434\u043e\u0432 \u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432 \u0441\u0442\u0430\u0440\u0435\u043d\u0438\u044f \u043c\u0435\u0442\u0430\u043b\u043b\u0430, \u043a\u0430\u043a\u0438\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u044f\u0442, \u0441 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