{"id":80,"date":"2017-12-26T09:46:51","date_gmt":"2017-12-26T06:46:51","guid":{"rendered":"https:\/\/metallsmaster.ru\/?p=80"},"modified":"2020-11-02T12:09:14","modified_gmt":"2020-11-02T09:09:14","slug":"chugun-s-sharovidnym-grafitom","status":"publish","type":"post","link":"https:\/\/metallsmaster.pro\/fr\/fonte-nodulaire\/","title":{"rendered":"Fonte nodulaire"},"content":{"rendered":"<p><strong>Fonte nodulaire <\/strong>Il s&#039;agit d&#039;un mat\u00e9riau structurel \u00e0 haute r\u00e9sistance dot\u00e9 d&#039;excellentes performances. Du magn\u00e9sium est ajout\u00e9 lors de la fusion, ce qui permet d&#039;obtenir un graphite coul\u00e9 non pas en forme de paillettes, mais plut\u00f4t de forme sph\u00e9rique quasi parfaite. Le r\u00e9sultat <strong>fonte nodulaire<\/strong> Il pr\u00e9sente de meilleures qualit\u00e9s que le gris et peut d\u00e9fier l&#039;acier lors de la comparaison de certaines propri\u00e9t\u00e9s.<\/p>\n<p>Le proc\u00e9d\u00e9 de fusion des alliages est relativement simple. La m\u00e9thode la plus courante pour produire ce type de fonte est probablement le proc\u00e9d\u00e9 au magn\u00e9sium. Cette technologie consiste \u00e0 ajouter des alliages de magn\u00e9sium et divers modificateurs complexes contenant du magn\u00e9sium au magn\u00e9sium m\u00e9tallique en fusion. Propri\u00e9t\u00e9s <strong>fonte \u00e0 graphite sph\u00e9ro\u00efdal <\/strong>Les mat\u00e9riaux de moulage sont vari\u00e9s, mais celui-ci se distingue par son excellente combinaison de propri\u00e9t\u00e9s de moulage et de r\u00e9sistance \u00e9lev\u00e9e. Ce mat\u00e9riau est tr\u00e8s ductile, ce qui le rend facile \u00e0 usiner. Il est relativement r\u00e9sistant aux charges variables et peu sensible aux concentrateurs de contraintes. La structure m\u00e9tallique de base peut \u00eatre ferritique ou perlitique. Les mat\u00e9riaux ferritiques peuvent contenir jusqu&#039;\u00e0 20% d&#039;inclusions de perlite, tandis que les mat\u00e9riaux perlitiques peuvent contenir jusqu&#039;\u00e0 20% de ferrite.<\/p>\n<h2>\n\t<!--<div class='top-banner-pages'>\t\n\n\t<\/div>--->\n\t<\/h2>\n<h2>Nuances de fonte nodulaire<\/h2>\n<p>La technologie de marquage des fontes \u00e0 graphite sph\u00e9ro\u00efdal suit une norme GOST sp\u00e9cifique et utilise des d\u00e9signations alphab\u00e9tiques et num\u00e9riques. Par exemple, le marquage \u00ab\u00a0\u0412\u0427\u00a0\u00bb d\u00e9signe une fonte \u00e0 haute r\u00e9sistance, suivi de chiffres indiquant la r\u00e9sistance \u00e0 la traction. Les donn\u00e9es sont exprim\u00e9es en MPa\u00a0; pour obtenir la valeur compl\u00e8te, il faut la multiplier par 10.<\/p>\n<p>Le symbole peut ressembler \u00e0 ceci : \u0412\u042750 GOST 7293-85, le num\u00e9ro 50 indique la r\u00e9sistance \u00e0 la traction de 500 MPa, \u0412\u042745 - r\u00e9sistance \u00e0 la traction de 450 MPa, \u0412\u042780 - r\u00e9sistance \u00e0 la traction de 800 MPa, etc. La liste\u00a0 <strong>nuances de fonte \u00e0 graphite sph\u00e9ro\u00efdal<\/strong> Il est facile \u00e0 couper, fond \u00e0 une temp\u00e9rature plus basse et poss\u00e8de d&#039;excellentes propri\u00e9t\u00e9s de moulage et m\u00e9caniques, \u00e0 peine moins bonnes que l&#039;acier. <strong>Nuances de fonte nodulaire <\/strong>\u0412\u0427100-4-3, \u0412\u0427110-6-5 ont une r\u00e9sistance \u00e0 la traction de 100-120 kgf\/mm<sup>2<\/sup> Conformes \u00e0 la norme GOST 7293-70, ces nuances sont utilis\u00e9es pour la coul\u00e9e de vilebrequins, de chemises de cylindre, d&#039;arbres \u00e0 cames et d&#039;autres composants soumis \u00e0 de fortes charges. Les nuances haute r\u00e9sistance VCh80 et 100 peuvent \u00eatre obtenues par microalliage suivi d&#039;une normalisation de la pi\u00e8ce moul\u00e9e.<\/p>\n<h3>\n<!---<div class='top-banner-pages'>\n\n<\/div>-->\n\n\t<\/h3>\n<h3>Fonte \u00e0 haute r\u00e9sistance \u00e0 graphite sph\u00e9ro\u00efdal<\/h3>\n<p>Gr\u00e2ce au fait que <strong>fonte ductile \u00e0 graphite nodulaire<\/strong> Cet alliage pr\u00e9sente des inclusions de graphite nodulaire plut\u00f4t que lamellaire et se caract\u00e9rise par une r\u00e9sistance m\u00e9canique \u00e9lev\u00e9e, une r\u00e9sistance \u00e0 l&#039;usure et de bonnes propri\u00e9t\u00e9s m\u00e9caniques et de moulage. <strong>fonte ductile \u00e0 graphite nodulaire <\/strong>Il est utilis\u00e9 avec beaucoup de succ\u00e8s pour la production de pi\u00e8ces critiques en construction m\u00e9canique : vilebrequins et arbres \u00e0 cames, pistons de moteurs diesel, culbuteurs de soupapes, diverses pi\u00e8ces d&#039;embrayage et autres structures fonctionnant sous des charges \u00e9lev\u00e9es et vari\u00e9es.<\/p>\n<p>Les nuances suivantes sont utilis\u00e9es pour les pi\u00e8ces moul\u00e9es\u00a0: VCh35, VCh40, VCh45, VCh50, VCh60, VCh70, VCh80 et VCh100. Il est \u00e9galement utilis\u00e9 pour la fabrication de conduites d&#039;adduction d&#039;eau \u00e0 haute r\u00e9sistance, ainsi que d&#039;ol\u00e9oducs et de gazoducs. Les tuyaux fabriqu\u00e9s dans ce mat\u00e9riau sont tr\u00e8s r\u00e9sistants, durables et se distinguent par d&#039;excellentes performances. Selon ses caract\u00e9ristiques, <strong>fonte ductile \u00e0 graphite nodulaire <\/strong>correspond presque enti\u00e8rement \u00e0 la fonte \u00e0 graphite sph\u00e9ro\u00efdal.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-81 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/M_4955233-0-300x282.webp\" alt=\"Piston diesel en fonte nodulaire\" width=\"300\" height=\"282\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/M_4955233-0-300x282.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/M_4955233-0-202x190.webp 202w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/M_4955233-0.webp 514w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-82 aligncenter\" src=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/camshaft_8v_kl_n1-300x154.webp\" alt=\"arbre \u00e0 cames en fonte\" width=\"300\" height=\"154\" srcset=\"https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/camshaft_8v_kl_n1-300x154.webp 300w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/camshaft_8v_kl_n1-768x395.webp 768w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/camshaft_8v_kl_n1.webp 1024w, https:\/\/metallsmaster.pro\/wp-content\/uploads\/2017\/12\/camshaft_8v_kl_n1-254x131.webp 254w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>La fonte nodulaire est un mat\u00e9riau de structure \u00e0 haute r\u00e9sistance avec de tr\u00e8s bonnes caract\u00e9ristiques de performance\u2026.<\/p>","protected":false},"author":1,"featured_media":81,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-80","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-metalls"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0427\u0443\u0433\u0443\u043d \u0441 \u0448\u0430\u0440\u043e\u0432\u0438\u0434\u043d\u044b\u043c \u0433\u0440\u0430\u0444\u0438\u0442\u043e\u043c, \u043c\u0430\u0440\u043a\u0438\u0440\u043e\u0432\u043a\u0430, \u043c\u0435\u0442\u043e\u0434\u044b \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0438 \u0441\u0444\u0435\u0440\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" 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