{"id":116526,"date":"2022-05-19T19:42:13","date_gmt":"2022-05-19T18:42:13","guid":{"rendered":"https:\/\/material-properties.org\/quelle-est-la-durete-de-la-fonte-blanche-definition\/"},"modified":"2022-05-23T06:53:35","modified_gmt":"2022-05-23T05:53:35","slug":"quelle-est-la-durete-de-la-fonte-blanche-definition","status":"publish","type":"post","link":"https:\/\/material-properties.org\/fr\/quelle-est-la-durete-de-la-fonte-blanche-definition\/","title":{"rendered":"Quelle est la duret\u00e9 de la fonte blanche &#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\">Duret\u00e9 de la fonte blanche &#8211; Ni-Cr-HC Fonte blanche martensitiqueLa duret\u00e9 Brinell de la fonte grise martensitique de la fonte blanche (ASTM A532 Classe 1 Type A) est d&rsquo;environ 600 MPa.<\/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<p><span>Avec une teneur en silicium plus faible (contenant moins de 1,0 % en poids d&rsquo;agent de graphitisation Si) et une vitesse de refroidissement plus rapide, le carbone de la fonte pr\u00e9cipite hors de la masse fondue sous forme de\u00a0<\/span><strong><span>c\u00e9mentite en phase m\u00e9tastable, Fe<\/span><sub><span>3<\/span><\/sub><span>C<\/span><\/strong><span>, plut\u00f4t que de graphite.\u00a0Le produit de cette solidification est connu sous le nom\u00a0<\/span><strong><span>de fonte blanche<\/span><\/strong><span>\u00a0(\u00e9galement appel\u00e9e fonte refroidie).\u00a0<\/span><strong><span>Les fontes blanches<\/span><\/strong><span>\u00a0sont\u00a0<\/span><strong><span>dures<\/span><\/strong><span>,\u00a0<\/span><strong><span>cassantes<\/span><\/strong><span>\u00a0et\u00a0<\/span><strong><span>inusinables<\/span><\/strong><span>, tandis que les fontes grises \u00e0 graphite plus tendre sont raisonnablement solides et usinables.\u00a0Une surface de rupture de cet alliage a un\u00a0<\/span><strong><span>aspect blanc<\/span><\/strong><span>, et c&rsquo;est pourquoi on l&rsquo;appelle fonte blanche.\u00a0Il est difficile de refroidir des pi\u00e8ces moul\u00e9es \u00e9paisses assez rapidement pour solidifier la fonte sous forme de fonte blanche tout au long.\u00a0Cependant, un refroidissement rapide peut \u00eatre utilis\u00e9 pour solidifier une coquille de fonte blanche, apr\u00e8s quoi le reste se refroidit plus lentement pour former un noyau de fonte grise.\u00a0Ce type de coul\u00e9e, parfois appel\u00e9 \u00ab<\/span><strong><span>coul\u00e9e refroidie<\/span><\/strong><span>\u00bb, a une surface ext\u00e9rieure plus dure et un noyau int\u00e9rieur plus r\u00e9sistant.<\/span><\/p>\n<p><strong><span>Le fer blanc<\/span><\/strong><span> est trop fragile pour \u00eatre utilis\u00e9 dans de nombreux composants structurels, mais avec une bonne duret\u00e9 et une bonne r\u00e9sistance \u00e0 l&rsquo;abrasion et un co\u00fbt relativement faible, il trouve une utilisation dans les applications o\u00f9 la r\u00e9sistance \u00e0 l&rsquo;usure est souhaitable, comme sur les dents des excavatrices, les roues et les volutes des pompes \u00e0 boue, coquilles et barres de levage dans les broyeurs \u00e0 boulets.<\/span><\/p>\n<p><span>Par exemple, la fonte blanche martensitique Ni-Cr-HC (alliage nickel-chrome \u00e0 haute teneur en carbone), ASTM A532 classe 1 type A, est de la fonte blanche martensitique, dans laquelle le nickel est le principal \u00e9l\u00e9ment d&rsquo;alliage car, \u00e0 des niveaux de 3 \u00e0 5%, il est efficace pour supprimer la transformation de la matrice aust\u00e9nitique en perlite, garantissant ainsi qu&rsquo;une structure martensitique dure se d\u00e9veloppera lors du refroidissement dans le moule.\u00a0Ce mat\u00e9riau peut \u00e9galement \u00eatre appel\u00e9 Ni-Hard 1. Ni-Hard 1 est un mat\u00e9riau r\u00e9sistant \u00e0 l&rsquo;abrasion utilis\u00e9 dans les applications o\u00f9 l&rsquo;impact est \u00e9galement un probl\u00e8me en tant que m\u00e9canisme d&rsquo;usure.<\/span><\/p>\n<h2><span>Duret\u00e9 de la fonte blanche \u2013 Fonte blanche martensitique Ni-Cr-HC<\/span><\/h2>\n<p><span>La duret\u00e9 Brinell de la fonte grise de la fonte blanche martensitique (ASTM A532 Classe 1 Type A) est d&rsquo;environ 600 MPa.<\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/table-brinell-hardness-numbers.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-full wp-image-28044\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/table-brinell-hardness-numbers.png\" alt=\"Num\u00e9ro de duret\u00e9 Brinell\" width=\"288\" height=\"297\" \/><\/a><span>En science des mat\u00e9riaux, la\u00a0<\/span><a href=\"https:\/\/material-properties.org\/what-is-hardness-definition\/\"><strong><span>duret\u00e9<\/span><\/strong><\/a><span>\u00a0est la capacit\u00e9 \u00e0 r\u00e9sister \u00e0\u00a0<\/span><strong><span>l&rsquo;indentation de surface<\/span><\/strong><span> (<\/span><strong><span>d\u00e9formation plastique localis\u00e9e<\/span><\/strong><span>) et aux\u00a0<\/span><strong><span>rayures<\/span><\/strong><span>.\u00a0<\/span><strong><span>La duret\u00e9<\/span><\/strong><span>\u00a0est probablement la propri\u00e9t\u00e9 mat\u00e9rielle la plus mal d\u00e9finie car elle peut indiquer une r\u00e9sistance aux rayures, une r\u00e9sistance \u00e0 l&rsquo;abrasion, une r\u00e9sistance \u00e0 l&rsquo;indentation ou encore une r\u00e9sistance \u00e0 la mise en forme ou \u00e0 la d\u00e9formation plastique localis\u00e9e.\u00a0La duret\u00e9 est importante d&rsquo;un point de vue technique car la r\u00e9sistance \u00e0 l&rsquo;usure par frottement ou \u00e9rosion par la vapeur, l&rsquo;huile et l&rsquo;eau augmente g\u00e9n\u00e9ralement avec la duret\u00e9.<\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/what-is-brinell-hardness-test-definition\/\"><strong><span>Le test de duret\u00e9 Brinell<\/span><\/strong><\/a><span>\u00a0est l&rsquo;un des tests de duret\u00e9 par indentation, qui a \u00e9t\u00e9 d\u00e9velopp\u00e9 pour les tests de duret\u00e9.\u00a0Dans les tests Brinell, un<\/span><strong><span>\u00a0p\u00e9n\u00e9trateur sph\u00e9rique<\/span><\/strong><span>\u00a0dur est forc\u00e9 sous une charge sp\u00e9cifique dans la surface du m\u00e9tal \u00e0 tester.\u00a0<\/span><strong><span>Le test typique utilise une bille en acier tremp\u00e9 de<\/span><\/strong><span> 10 mm (0,39 in) de diam\u00e8tre \u00a0comme p\u00e9n\u00e9trateur avec une force de 3 000 kgf (29,42 kN; 6 614 lbf).\u00a0La charge est maintenue constante pendant un temps d\u00e9termin\u00e9 (entre 10 et 30 s).\u00a0Pour les mat\u00e9riaux plus tendres, une force plus faible est utilis\u00e9e;\u00a0pour les mat\u00e9riaux plus durs, une<\/span><strong><span>\u00a0bille en carbure de tungst\u00e8ne<\/span><\/strong><span>\u00a0remplace la bille en acier.<\/span><\/p>\n<p><span>Le test fournit des r\u00e9sultats num\u00e9riques pour quantifier la duret\u00e9 d&rsquo;un mat\u00e9riau, qui est exprim\u00e9e par le\u00a0<\/span><strong><span>nombre de duret\u00e9 Brinell<\/span><\/strong><span>\u00a0&#8211;\u00a0<\/span><strong><span>HB<\/span><\/strong><span>. Le nombre de duret\u00e9 Brinell est d\u00e9sign\u00e9 par les normes d&rsquo;essai les plus couramment utilis\u00e9es (ASTM E10-14[2] et ISO 6506\u20131:2005) comme HBW (H de la duret\u00e9, B de Brinell et W du mat\u00e9riau du p\u00e9n\u00e9trateur, le tungst\u00e8ne (wolfram) carbure). Dans les anciennes normes, HB ou HBS \u00e9taient utilis\u00e9s pour d\u00e9signer les mesures effectu\u00e9es avec des p\u00e9n\u00e9trateurs en acier.<\/span><\/p>\n<p><span>L&rsquo; indice de\u00a0<\/span><strong><span>duret\u00e9 Brinell<\/span><\/strong><span> (HB) est la charge divis\u00e9e par la surface de l&rsquo;indentation.\u00a0Le diam\u00e8tre de l&#8217;empreinte est mesur\u00e9 avec un microscope \u00e0 \u00e9chelle superpos\u00e9e.\u00a0Le nombre de duret\u00e9 Brinell est calcul\u00e9 \u00e0 partir de l&rsquo;\u00e9quation:<\/span><\/p>\n<p><a href=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/brinell-hardness-number-definition.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-28042\" src=\"https:\/\/material-properties.org\/wp-content\/uploads\/2020\/01\/brinell-hardness-number-definition.png\" alt=\"Essai de duret\u00e9 Brinell\" width=\"320\" height=\"190\" \/><\/a><\/p>\n<p><span>Il existe une vari\u00e9t\u00e9 de m\u00e9thodes d&rsquo;essai couramment utilis\u00e9es (par exemple, Brinell,\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/hardness\/knoop-hardness-test-knoop-hardness-number\/\"><span>Knoop<\/span><\/a><span>,\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/hardness\/vickers-hardness-test-vickers-hardness-number\/\"><span>Vickers<\/span><\/a><span>\u00a0et\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-science\/material-properties\/hardness\/rockwell-hardness-test\/\"><span>Rockwell<\/span><\/a><span>).\u00a0Il existe des tableaux qui sont disponibles corr\u00e9lant les nombres de duret\u00e9 des diff\u00e9rentes m\u00e9thodes d&rsquo;essai o\u00f9 la corr\u00e9lation est applicable.\u00a0Dans toutes les \u00e9chelles, un nombre \u00e9lev\u00e9 de duret\u00e9 repr\u00e9sente un m\u00e9tal dur.<\/span><\/p>\n<p><span>\u00a0<\/span><\/p>\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>fonte blanche<a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/metals-what-are-metals\/cast-iron\/\" class=\"su-button su-button-style-flat\" style=\"color:#606060;background-color:#ffffff ;border-color:#ffffff ;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>Duret\u00e9 de la fonte blanche<\/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,\u00a0Duret\u00e9 de la fonte blanche, 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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