{"id":115973,"date":"2022-05-08T15:46:24","date_gmt":"2022-05-08T14:46:24","guid":{"rendered":"https:\/\/material-properties.org\/quest-ce-que-le-raffinement-du-grain-renforcement-des-limites-du-grain-definition\/"},"modified":"2022-05-11T08:18:46","modified_gmt":"2022-05-11T07:18:46","slug":"quest-ce-que-le-raffinement-du-grain-renforcement-des-limites-du-grain-definition","status":"publish","type":"post","link":"https:\/\/material-properties.org\/fr\/quest-ce-que-le-raffinement-du-grain-renforcement-des-limites-du-grain-definition\/","title":{"rendered":"Qu&rsquo;est-ce que le raffinement du grain &#8211; Renforcement des limites du grain &#8211; D\u00e9finition"},"content":{"rendered":"<p><span><div class=\"su-quote su-quote-style-default\"><div class=\"su-quote-inner su-u-clearfix su-u-trim\">Le renforcement des joints de grains (ou renforcement Hall-Petch) est une m\u00e9thode de renforcement des mat\u00e9riaux en modifiant leur taille moyenne de cristallite (grain).<\/div><\/div><\/span><\/p>\n<p><span><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><\/span><\/p>\n<p><span><div  class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<h2><span>Renforcement des m\u00e9taux<\/span><\/h2>\n<p><span>La r\u00e9sistance des m\u00e9taux et des alliages peut \u00eatre modifi\u00e9e par diverses combinaisons de travail \u00e0 froid, d&rsquo;alliage et de traitement thermique.\u00a0Comme indiqu\u00e9 dans la section pr\u00e9c\u00e9dente, la capacit\u00e9 d&rsquo;un mat\u00e9riau cristallin \u00e0 se d\u00e9former plastiquement d\u00e9pend en grande partie de la capacit\u00e9 de la dislocation \u00e0 se d\u00e9placer dans un mat\u00e9riau.\u00a0Par cons\u00e9quent, emp\u00eacher le mouvement des dislocations entra\u00eenera le renforcement du mat\u00e9riau.\u00a0Par exemple, une microstructure avec des\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/crystal-structures\/grain-structure-grains-in-crystalline-materials\/\"><span>grains<\/span><\/a><span>\u00a0plus fins se traduit g\u00e9n\u00e9ralement \u00e0 la fois par une r\u00e9sistance plus \u00e9lev\u00e9e et une t\u00e9nacit\u00e9 sup\u00e9rieure par rapport au m\u00eame alliage avec des grains physiquement plus gros.\u00a0En cas de taille de grain, il peut \u00e9galement y avoir un compromis entre les caract\u00e9ristiques de r\u00e9sistance et de fluage.\u00a0D&rsquo;autres m\u00e9canismes de renforcement sont obtenus au d\u00e9triment d&rsquo;une ductilit\u00e9 et d&rsquo;une t\u00e9nacit\u00e9 inf\u00e9rieures.\u00a0Il existe de nombreux m\u00e9canismes de renforcement, notamment:<\/span><\/p>\n<ul>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/metals-what-are-metals\/metalworking\/solid-solution-strengthening-alloying\/\"><strong><span>Renforcement de solution solide<\/span><\/strong><span>\u00a0(alliage)<\/span><\/a><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/metals-what-are-metals\/metalworking\/work-hardening-cold-working\/\"><strong><span>Ecrouissage (travail \u00e0 froid)<\/span><\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/metals-what-are-metals\/metalworking\/precipitation-hardening-age-hardening\/\"><strong><span>Durcissement par pr\u00e9cipitation<\/span><\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/metals-what-are-metals\/metalworking\/grain-refinement-grain-boundary-strenthening\/\"><strong><span>Raffinement du grain<\/span><\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/metals-what-are-metals\/metalworking\/transformation-hardening-martensitic-transformation-hardening\/\"><strong><span>Durcissement par transformation<\/span><\/strong><\/a><\/li>\n<\/ul>\n<h2><span>Raffinement des grains &#8211; Renforcement des limites des grains<\/span><\/h2>\n<figure id=\"attachment_27618\" aria-describedby=\"caption-attachment-27618\" style=\"width: 290px\" class=\"wp-caption alignright\"><img decoding=\"async\" loading=\"lazy\" class=\"size-medium wp-image-27618\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/07\/Grains-Grain-Boundaries-300x160.png\" alt=\"Grains - Limites de grains\" width=\"300\" height=\"160\" \/><figcaption id=\"caption-attachment-27618\" class=\"wp-caption-text\"><span>Grains et limites Source : D\u00e9partement am\u00e9ricain de l&rsquo;\u00e9nergie, Science des mat\u00e9riaux.\u00a0DOE Fundamentals Handbook, Volume 1 et 2. Janvier 1993.<\/span><\/figcaption><\/figure>\n<p><strong><span>Le renforcement des joints de grains (ou renforcement<\/span><\/strong><span> Hall \u2013 Petch) est une m\u00e9thode de renforcement des mat\u00e9riaux en modifiant leur taille moyenne de cristallite (grain).\u00a0La taille du grain d\u00e9termine les propri\u00e9t\u00e9s du m\u00e9tal.\u00a0Par exemple, une taille de grain plus petite augmente la r\u00e9sistance \u00e0 la traction et tend \u00e0 augmenter la ductilit\u00e9.\u00a0Une taille de grain plus grande est pr\u00e9f\u00e9r\u00e9e pour am\u00e9liorer les propri\u00e9t\u00e9s de fluage \u00e0 haute temp\u00e9rature.\u00a0La diminution de la taille des grains est \u00e9galement un moyen efficace d&rsquo;augmenter la ductilit\u00e9.\u00a0Lorsque la taille des grains est r\u00e9duite, il y a plus de grains avec un plus grand nombre de plans de glissement arbitrairement align\u00e9s pour les dislocations dans les grains.\u00a0Cela offre plus de possibilit\u00e9s pour qu&rsquo;un certain glissement se produise dans un mat\u00e9riau sous contrainte.\u00a0Les joints de grains agissent comme un obstacle au mouvement des dislocations pour les deux raisons suivantes:<\/span><\/p>\n<ol>\n<li><span>La dislocation doit changer sa direction de mouvement en raison de l&rsquo;orientation diff\u00e9rente des grains.<\/span><\/li>\n<li><span>Discontinuit\u00e9 des plans de glissement du grain un au grain deux.<\/span><\/li>\n<\/ol>\n<p><span>Ainsi, le raffinement du grain fournit un moyen important d&rsquo;am\u00e9liorer non seulement la r\u00e9sistance, mais \u00e9galement la ductilit\u00e9 et la t\u00e9nacit\u00e9.\u00a0De nombreux autres m\u00e9canismes de renforcement sont obtenus au d\u00e9triment de la ductilit\u00e9 et de la t\u00e9nacit\u00e9.\u00a0Pour de nombreux mat\u00e9riaux, la limite d&rsquo;\u00e9lasticit\u00e9 \u03c3 varie avec la taille des grains selon<\/span><\/p>\n<p style=\"text-align: center;\"><span>\u03c3\u00a0<\/span><sub><span>y<\/span><\/sub><span>\u00a0= \u03c3\u00a0<\/span><sub><span>y,0<\/span><\/sub><span>\u00a0+ k\/d\u00a0<\/span><sup><span>x<\/span><\/sup><\/p>\n<p><span>Dans cette expression, appel\u00e9e\u00a0<\/span><strong><span>\u00e9quation de Hall-Petch<\/span><\/strong><span>, k est une constante, d est le diam\u00e8tre moyen des grains et \u03c3<\/span><sub><span>y,0<\/span><\/sub><span>\u00a0est la limite d&rsquo;\u00e9lasticit\u00e9 d&rsquo;origine.\u00a0Notez que cette \u00e9quation n&rsquo;est pas valable \u00e0 la fois pour les mat\u00e9riaux polycristallins \u00e0 grains tr\u00e8s gros (c&rsquo;est-\u00e0-dire grossiers) et \u00e0 grains extr\u00eamement fins.<\/span><\/p>\n<p><span>L&rsquo;effet synergique des \u00e9l\u00e9ments d&rsquo;alliage et du traitement thermique produit une grande vari\u00e9t\u00e9 de microstructures et de propri\u00e9t\u00e9s des aciers.<\/span><\/p>\n<ul>\n<li><strong><span>Vanadium<\/span><\/strong><span>.\u00a0Le vanadium est g\u00e9n\u00e9ralement ajout\u00e9 \u00e0 l&rsquo;acier pour inhiber la croissance des grains pendant le traitement thermique.\u00a0En contr\u00f4lant la croissance des grains, il am\u00e9liore \u00e0 la fois la r\u00e9sistance et la t\u00e9nacit\u00e9 des aciers tremp\u00e9s et revenus.\u00a0La taille du grain d\u00e9termine les propri\u00e9t\u00e9s du m\u00e9tal.\u00a0Par exemple, une taille de grain plus petite augmente la r\u00e9sistance \u00e0 la traction et tend \u00e0 augmenter la ductilit\u00e9.\u00a0Une taille de grain plus grande est pr\u00e9f\u00e9r\u00e9e pour am\u00e9liorer les propri\u00e9t\u00e9s de fluage \u00e0 haute temp\u00e9rature.<\/span><\/li>\n<li><strong><span>Tungst\u00e8ne<\/span><\/strong><span>.\u00a0Le tungst\u00e8ne produit des carbures stables et affine la taille des grains afin d&rsquo;augmenter la duret\u00e9, en particulier \u00e0 haute temp\u00e9rature.\u00a0Le tungst\u00e8ne est largement utilis\u00e9 dans les aciers \u00e0 outils rapides et a \u00e9t\u00e9 propos\u00e9 comme substitut du molybd\u00e8ne dans les aciers ferritiques \u00e0 activation r\u00e9duite pour les applications nucl\u00e9aires.<\/span><\/li>\n<\/ul>\n<p><span><\/span><\/p><\/div><\/div><\/span><\/p>\n<p><span><div  class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<p><span><div class=\"su-accordion su-u-trim\"><div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus\" data-scroll-offset=\"0\" data-anchor-in-url=\"no\"><div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span class=\"su-spoiler-icon\"><\/span>R\u00e9f\u00e9rences :<\/div><div class=\"su-spoiler-content su-u-clearfix su-u-trim\">Science des mat\u00e9riaux:<\/div><\/div><\/div><\/span><\/p>\n<p><span>D\u00e9partement am\u00e9ricain de l&rsquo;\u00e9nergie, science des mat\u00e9riaux.\u00a0DOE Fundamentals Handbook, Volume 1 and 2. Janvier 1993.<\/span><br \/>\n<span>US Department of Energy, Material Science.\u00a0DOE Fundamentals Handbook, Volume 2 et 2. Janvier 1993.<\/span><br \/>\n<span>William D. Callister, David G. Rethwisch.\u00a0Science et g\u00e9nie des mat\u00e9riaux : une introduction 9e \u00e9dition, Wiley ;\u00a09 \u00e9dition (4 d\u00e9cembre 2013), ISBN-13\u00a0: 978-1118324578.<\/span><br \/>\n<span>En ligneEberhart, Mark (2003).\u00a0Pourquoi les choses se cassent\u00a0: Comprendre le monde par la mani\u00e8re dont il se d\u00e9compose.\u00a0Harmonie.\u00a0ISBN 978-1-4000-4760-4.<\/span><br \/>\n<span>Gaskell, David R. (1995).\u00a0Introduction \u00e0 la thermodynamique des mat\u00e9riaux (4e \u00e9d.).\u00a0\u00c9ditions Taylor et Francis.\u00a0ISBN 978-1-56032-992-3.<\/span><br \/>\n<span>Gonz\u00e1lez-Vi\u00f1as, W. &amp; Mancini, HL (2004).\u00a0Une introduction \u00e0 la science des mat\u00e9riaux.\u00a0Presse universitaire de Princeton.\u00a0ISBN 978-0-691-07097-1.<\/span><br \/>\n<span>Ashby, Michael;\u00a0Hugh Shercliff;\u00a0David Cebon (2007).\u00a0Mat\u00e9riaux: ing\u00e9nierie, science, traitement et conception (1\u00e8re \u00e9d.).\u00a0Butterworth-Heinemann.\u00a0ISBN 978-0-7506-8391-3.<\/span><br \/>\n<span>JR Lamarsh, AJ Baratta, Introduction au g\u00e9nie nucl\u00e9aire, 3e \u00e9d., Prentice-Hall, 2001, ISBN : 0-201-82498-1.<\/span><br \/>\n<span><\/span><\/p><\/div><\/div><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><div class=\"su-divider su-divider-style-default\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\"><\/div><\/div><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\">\n<p><span>Voir ci-dessus:<\/span><br \/>\n<span>Travail des m\u00e9taux<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/metals-what-are-metals\/metalworking\/\" class=\"su-button su-button-style-flat\" style=\"color: #606060;background-color:#ffffff;border-color:#cccccc;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px\" target=\"_self\"><span style=\"color: #606060;padding:7px 20px;font-size:16px;line-height:24px;border-color:#ffffff;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px;text-shadow:0px 0px 0px #000000;-moz-text-shadow:0px 0px 0px #000000;-webkit-text-shadow:0px 0px 0px #000000\"><img src=\"icon : lien\" alt=\"\" style=\"width:24px;height:24px\" \/> <\/span><\/a><\/span><\/p><\/div><\/div><div  class=\"lgc-column lgc-grid-parent lgc-grid-33 lgc-tablet-grid-33 lgc-mobile-grid-100 lgc-equal-heights \"><div  class=\"inside-grid-column\"><\/div><\/div><\/span><\/p>\n<p><span><div class=\"su-divider su-divider-style-dotted\" style=\"margin:15px 0;border-width:2px;border-color:#999999\"><\/div><\/span><\/p>\n<p><span>Nous esp\u00e9rons que cet article,\u00a0<\/span><strong><span>Grain Refinement &#8211; Grain Boundary Strenthening<\/span><\/strong><span>, vous aidera.\u00a0Si oui,\u00a0<\/span><strong><span>donnez-nous un like<\/span><\/strong><span>\u00a0dans la barre lat\u00e9rale.\u00a0L&rsquo;objectif principal de ce site Web est d&rsquo;aider le public \u00e0 apprendre des informations int\u00e9ressantes et importantes sur les mat\u00e9riaux et leurs propri\u00e9t\u00e9s.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nous esp\u00e9rons que cet article,\u00a0Grain Refinement &#8211; Grain Boundary Strenthening, vous aidera.\u00a0Si oui,\u00a0donnez-nous un like\u00a0dans la barre lat\u00e9rale.\u00a0L&rsquo;objectif principal de ce site Web est d&rsquo;aider le public \u00e0 apprendre des informations int\u00e9ressantes et importantes sur les mat\u00e9riaux et leurs propri\u00e9t\u00e9s.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[53],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.2 - 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