{"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\/it\/invecchiamento-del-metallo\/","title":{"rendered":"Invecchiamento del metallo, tipi, artificiale, naturale, come avviene e da cosa dipende"},"content":{"rendered":"<p><strong>Invecchiamento dei metalli <\/strong>un processo piuttosto lento che provoca cambiamenti meccanici e alterazioni nelle propriet\u00e0 fisiche e chimiche.<\/p>\n<p>SU <strong>invecchiamento dei metalli <\/strong>\u00e8 influenzato da una serie di fattori, tra cui:<\/p>\n<ul>\n<li>moto termico di atomi e molecole;<\/li>\n<li>impatto meccanico (vari carichi di flessione\/compressione\/strappo, ecc.);<\/li>\n<li>radiazioni luminose (in particolare radiazioni invisibili all&#039;uomo);<\/li>\n<li>campo magnetico (magnetizzazione\/smagnetizzazione), ecc.<\/li>\n<\/ul>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>L&#039;essenza dell&#039;invecchiamento dei metalli \u00e8 il raggiungimento di uno stato di equilibrio, durante il quale le propriet\u00e0 del metallo si discostano dalla norma. In particolare, il materiale pu\u00f2 diventare pi\u00f9 morbido, fragile, meno elastico, ecc.<\/p>\n<h2>Tipi di invecchiamento dei metalli<\/h2>\n<blockquote><p>Si distingue tra invecchiamento naturale e artificiale.<\/p><\/blockquote>\n<p>L&#039;invecchiamento artificiale del metallo consiste nel rapido raggiungimento della composizione e delle propriet\u00e0 desiderate. L&#039;invecchiamento artificiale si ottiene attraverso il trattamento termico e la deformazione plastica. Ad esempio, nella produzione del duralluminio, questo viene invecchiato artificialmente per diverse ore.<\/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 dell&#039;invecchiamento del metallo\" 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>L&#039;invecchiamento naturale avviene in modo naturale e non richiede condizioni aggiuntive. Tuttavia, il processo \u00e8 pi\u00f9 intenso con periodi di tempo pi\u00f9 lunghi e temperature che si avvicinano ai 20 \u00b0C.<\/p>\n<h3>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/h3>\n<h3>Applicazione dei processi di invecchiamento nella metallurgia e nella lavorazione dei metalli<\/h3>\n<p>L&#039;invecchiamento, come trattamento aggiuntivo, viene utilizzato come fase finale. Viene applicato a determinati metalli e leghe in cui una soluzione solida sovrasatura pu\u00f2 far precipitare i componenti in eccesso e decomporsi spontaneamente nel tempo. Questo metodo \u00e8 particolarmente utile per preparare i materiali per la produzione di singoli componenti e parti per i quali il processo sopra descritto \u00e8 fondamentale.<\/p>\n<blockquote><p>Dopo l&#039;invecchiamento, la durezza e la resistenza del metallo aumentano, ma la sua viscosit\u00e0 e duttilit\u00e0 diminuiscono. Tuttavia, \u00e8 importante notare che questi valori vengono mantenuti per tutta la durata di vita del materiale.<\/p><\/blockquote>\n<p>L&#039;invecchiamento dell&#039;acciaio viene eseguito per modificarne la struttura interna e viene applicato dopo la tempra. La soluzione solida di ferrite risultante, satura di azoto e carbonio, si decompone per riscaldamento. A seconda del volume di inclusioni di carbonio nel materiale &quot;invecchiato&quot;, la struttura interna assume le seguenti forme:<\/p>\n<ul>\n<li>cubo;<\/li>\n<li>sferico;<\/li>\n<li>a forma di disco (sotto forma di lamine sottili);<\/li>\n<li>aghiforme.<\/li>\n<\/ul>\n\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t\n<p>Il trattamento termico (invecchiamento artificiale del metallo) viene applicato alle leghe in cui la solubilit\u00e0 di un elemento allo stato solido \u00e8 significativamente ridotta. Questa propriet\u00e0 diventa pi\u00f9 pronunciata al diminuire della temperatura.<\/p>\n<p>Negli acciai a basso contenuto di carbonio, non superiore a 0,05%, l&#039;invecchiamento artificiale provoca la decomposizione della soluzione alfa solida sovrasatura. Di conseguenza, le fasi in eccesso precipitano. Dopo tale trattamento, la duttilit\u00e0 diminuisce, ma durezza e resistenza aumentano significativamente. Queste sono esattamente le qualit\u00e0 spesso richieste nel prodotto metallurgico finale.<\/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=\"Il modello di 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>Il modello di Orowan<\/em><\/p>\n<p>La figura mostra il modello Orowan, che illustra chiaramente il movimento di dislocazione. L&#039;effetto massimo pu\u00f2 essere ottenuto attraverso l&#039;invecchiamento naturale. Tuttavia, questo richiede una notevole quantit\u00e0 di tempo, il che non \u00e8 n\u00e9 conveniente n\u00e9 pratico per una produzione continua e ad alto volume (non \u00e8 come far riposare vino o cognac nelle botti). Pertanto, esistono metodi artificiali per accelerare questi processi naturali (\u00e8 un peccato che non si possa fare lo stesso con il whisky). Tuttavia, vale la pena notare che l&#039;invecchiamento artificiale ridurr\u00e0 significativamente le propriet\u00e0 di resistenza del materiale.<\/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=\"Durezza in base al tempo di invecchiamento\" 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>Durezza in base al tempo di invecchiamento<\/em><\/p>\n<p>Il grafico riportato dimostra chiaramente il problema descritto sopra: ridurre il tempo di invecchiamento del metallo non ne aumenta le caratteristiche di resistenza.<\/p>\n<p>Il processo di invecchiamento dipende in larga misura dal carbonio e dall&#039;azoto. Ci\u00f2 \u00e8 particolarmente evidente negli acciai a basso tenore di carbonio. L&#039;azoto si dissolve meno facilmente nella ghisa alfa al diminuire della temperatura. Ad esempio, a 590 \u00b0C, il contenuto di azoto disciolto \u00e8 0,11 TP3T, ma a 20 \u00b0C, il suo contenuto scende a 0,0041 TP3T. Durante l&#039;invecchiamento, la soluzione alfa rilascia nitruri. Pertanto, l&#039;effetto dell&#039;azoto \u00e8 meno pronunciato di quello del carbonio sotto l&#039;influenza termica.<\/p>\n\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t\n<p>All&#039;aumentare del contenuto di carbonio nell&#039;acciaio, aumentano anche le alterazioni strutturali prodotte dal trattamento termico. La quantit\u00e0 massima di carbonio che pu\u00f2 dissolversi nella ghisa alfa \u00e8 0,02-0,04%. Con questo contenuto, un prodotto temprato sottoposto a invecchiamento naturale presenta una durezza una volta e mezza maggiore rispetto a quella ottenuta dopo ricottura.<\/p>\n<blockquote><p>L&#039;invecchiamento \u00e8 il metodo principale per aumentare la resistenza delle leghe resistenti al calore (leghe ad alto contenuto di nichel). Questo gruppo include anche leghe a base di alluminio, rame e magnesio. Inoltre, la struttura alterata di questi metalli e leghe conferisce coercivit\u00e0.<\/p><\/blockquote>\n<p>L&#039;alluminio e le leghe alluminio-rame subiscono degradazione a temperature diverse (superiori a 100 \u00b0C) a causa delle diverse temperature di decomposizione strutturale dei diversi metalli. Pertanto, si distingue tra decomposizione strutturale a bassa temperatura e ad alta temperatura.<\/p>\n<p>La decomposizione di una soluzione solida avviene in due modi. Nel primo caso, la formazione e la crescita delle particelle di fase si verificano in tutto il volume. Nel secondo caso, la decomposizione \u00e8 discontinua (cellulare). Durante questo processo, le cellule crescono in colonie. Le colonie hanno una struttura cellulare e la crescita avviene dal bordo del grano e si muove verso l&#039;interno, diminuendo di dimensioni.<\/p>\n<h3>Invecchiamento meccanico e termico<\/h3>\n<p>Esistono due tipi di invecchiamento dei metalli: termico e meccanico. Analizziamoli pi\u00f9 nel dettaglio.<\/p>\n<h3>Invecchiamento termico<\/h3>\n<p>La fase che rafforza il metallo durante il trattamento termico si verifica nel suo punto massimo. \u00c8 qui che si forma la fase di soluzione metastabile nella zona di Guinier-Preston. Questo tipo di rafforzamento di metalli e leghe \u00e8 comunemente noto come rafforzamento per dispersione.<\/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=\"Dipendenza della resistenza dal tempo e dalla temperatura di invecchiamento\" 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>Dipendenza della resistenza dal tempo e dalla temperatura di invecchiamento<\/em><\/p>\n<p>Con un&#039;esposizione prolungata, si verifica un invecchiamento eccessivo, che comporta una riduzione delle caratteristiche di resistenza. Questo \u00e8 influenzato da:<\/p>\n<ul>\n<li>coagulazione;<\/li>\n<li>sostituzione parziale di particelle con particelle incoerenti.<\/li>\n<\/ul>\n<p>Tipi di invecchiamento termico del metallo:<\/p>\n<ul>\n<li>In due fasi: spegnimento, successivo mantenimento alla temperatura di sostituzione e successivo mantenimento a temperatura elevata per ottenere l&#039;omogeneit\u00e0 della soluzione solida.<\/li>\n<li>Tempra \u2013 tempra e una fase di mantenimento con raffreddamento naturale.<\/li>\n<li>Naturale - per le leghe di alluminio.<\/li>\n<li>Artificiale \u2013 per le leghe di metalli non ferrosi mediante riscaldamento a una temperatura superiore a quella utilizzata per la distruzione naturale.<\/li>\n<li>Stabilizzazione: l&#039;elevata temperatura di invecchiamento e il lungo periodo di mantenimento contribuiscono a mantenere le dimensioni e le propriet\u00e0 del pezzo.<\/li>\n<\/ul>\n<h3>Invecchiamento meccanico del metallo<\/h3>\n<p>La distruzione dell&#039;acciaio dovuta a forze deformanti avviene nell&#039;intervallo di temperatura inferiore a quello del processo di ricristallizzazione. Ci\u00f2 \u00e8 causato dalla formazione e dal movimento delle dislocazioni. La deformazione plastica a freddo aumenta la densit\u00e0 delle dislocazioni, che aumenta ulteriormente con l&#039;aumentare dei carichi.<\/p>\n<p>Le mutevoli propriet\u00e0 meccaniche del metallo fanno s\u00ec che gli atomi di carbonio e azoto si muovano verso le dislocazioni situate nella soluzione alfa. Una volta raggiunte le dislocazioni, gli atomi formano delle nubi (atmosfere di Cottrell). Questi ammassi ostacolano il movimento delle dislocazioni, determinando una variazione delle propriet\u00e0. Compaiono le propriet\u00e0 intrinseche dei componenti sottoposti a invecchiamento termico.<\/p>\n<p>Mentre azoto, nichel e rame influenzano significativamente l&#039;effetto di invecchiamento dovuto alla deformazione, l&#039;aggiunta di vanadio, titanio e niobio elimina completamente questo effetto. Pertanto, si consiglia di utilizzare acciaio con un contenuto di alluminio compreso tra 0,02 e 0,07%.<\/p>\n<h4>Modalit\u00e0 consigliate per l&#039;invecchiamento<\/h4>\n<p>Trattamento termico:<\/p>\n<ul>\n<li>per acciai ad alto tenore di carbonio: temperatura di circa 130\u00b0C-150\u00b0C, tempo di permanenza di circa 25-30 ore;<\/li>\n<li>per leghe di metalli non ferrosi: temperatura di circa 250\u00b0C, tempo di mantenimento di circa 1 ora.<\/li>\n<\/ul>\n<p>Lavorazione della plastica:<\/p>\n<ul>\n<li>per un processo naturale: temperatura di circa 20\u00b0C;<\/li>\n<li>per flusso di processo artificiale: temperatura di circa 250\u00b0C, tempo di mantenimento di circa 1 ora.<\/li>\n<\/ul>\n<p>La temperatura di riscaldamento e il tempo di mantenimento vengono selezionati individualmente per ogni grado di metallo e lega, in base alla loro composizione.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>L&#039;invecchiamento dei metalli \u00e8 un processo piuttosto lento, che provoca cambiamenti meccanici, cambiamenti nelle caratteristiche fisiche e...<\/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 \u0447\u0435\u043c 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