{"id":7694,"date":"2024-07-27T13:10:29","date_gmt":"2024-07-27T05:10:29","guid":{"rendered":"https:\/\/am-material.com\/?p=7694"},"modified":"2024-07-25T13:25:12","modified_gmt":"2024-07-25T05:25:12","slug":"high-temperature-oxidation-of-inconel-939-formed-by-lpbf","status":"publish","type":"post","link":"https:\/\/am-material.com\/fr\/news\/high-temperature-oxidation-of-inconel-939-formed-by-lpbf\/","title":{"rendered":"Oxydation \u00e0 haute temp\u00e9rature de l'Inconel 939 form\u00e9 par LPBF"},"content":{"rendered":"
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Oxydation \u00e0 haute temp\u00e9rature de l'Inconel 939 form\u00e9 par LPBF<\/strong><\/p>

Introduction<\/strong><\/p>

Superalliages \u00e0 base de nickel<\/strong> sont des alliages r\u00e9sistants \u00e0 la corrosion con\u00e7us pour des applications \u00e0 haute temp\u00e9rature allant de 1100 \u00e0 1150\u00b0C. En raison de leurs niveaux \u00e9lev\u00e9s de r\u00e9sistance au fluage, \u00e0 la vulcanisation et \u00e0 l'oxydation, ces alliages ont \u00e9t\u00e9 largement utilis\u00e9s dans les secteurs de l'a\u00e9rospatiale et de l'\u00e9nergie. Ils contiennent g\u00e9n\u00e9ralement jusqu'\u00e0 10 \u00e9l\u00e9ments d'alliage, y compris des \u00e9l\u00e9ments l\u00e9gers tels que le carbone ou le bore, et des \u00e9l\u00e9ments lourds r\u00e9fractaires tels que Ta, W, Nb ou Re.<\/p>

Inconel 939<\/strong>(\u00e9galement connu sous le nom de IN939<\/strong>) est un superalliage \u00e0 haute teneur en chrome couramment utilis\u00e9 dans les pales et aubes de turbines. Cet alliage pr\u00e9sente une bonne aptitude au soudage et une r\u00e9sistance suffisante \u00e0 des temp\u00e9ratures de fonctionnement allant jusqu'\u00e0 950\u00b0C. Les superalliages similaires \u00e0 In939, tels que In718, In625 et Rene 220, forment une couche de Cr2O3 par l'oxydation pr\u00e9f\u00e9rentielle du Cr, prot\u00e9geant ainsi le m\u00e9tal de la corrosion \u00e0 haute temp\u00e9rature. La couche d'oxyde form\u00e9e est g\u00e9n\u00e9ralement dense et \u00e0 croissance lente et a une longue dur\u00e9e de vie \u00e0 des temp\u00e9ratures de fonctionnement allant jusqu'\u00e0 1000\u00b0C. Lors de son utilisation, la couche de Cr2O3 est soumise \u00e0 des contraintes, en particulier dans des conditions cycliques, ce qui peut entra\u00eener l'\u00e9caillage de la couche.<\/p>

Dans le cadre de cette \u00e9tude, les caract\u00e9ristiques d'oxydation des IN939<\/strong> produites par AM et CM (coul\u00e9e) a \u00e9t\u00e9 \u00e9tudi\u00e9e en d\u00e9tail apr\u00e8s une exposition \u00e0 900\u00b0C pendant 158 heures \u00e0 l'aide d'un microscope optique, d'un microscope \u00e9lectronique \u00e0 balayage (MEB) et d'une spectroscopie \u00e0 rayons X \u00e0 dispersion d'\u00e9nergie (EDX).<\/p>

Mat\u00e9riaux <\/strong><\/p>

Les IN939<\/strong> sont produits \u00e0 la fois par AM (fusion laser sur lit de poudre, LPBF) et par CM (coul\u00e9e). La composition chimique des alliages AM et CM In939 est indiqu\u00e9e dans le tableau suivant Tableau 1<\/strong>:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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R\u00e9sultats et discussion<\/strong><\/p>

Figure 1<\/strong> montre une micrographie optique de la microstructure grav\u00e9e de l'AM In939 avec une taille moyenne de 100-120 \u03bcm.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Figure 2<\/strong> montre les coupes transversales SEM-EDX des \u00e9chantillons AM-Y, AM-Z et CM In939 apr\u00e8s oxydation \u00e0 900\u00b0C pendant 158 heures. D'apr\u00e8s l'image de la section transversale, les \u00e9chantillons de Couches de Cr2O3<\/strong> d'une \u00e9paisseur moyenne de 3 \u03bcm sont pr\u00e9sentes sur tous les \u00e9chantillons. La couche est continue et uniforme, et il n'y a pas de diff\u00e9rence significative dans l'\u00e9chelle de croissance externe entre les \u00e9chantillons en termes de composition de phase et d'\u00e9paisseur de la couche d'oxyde due \u00e0 l'anisotropie de la microstructure. Cela signifie que l'anisotropie de la microstructure des mat\u00e9riaux AM n'affecte pas le comportement \u00e0 l'oxydation dans ces conditions :<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Conclusion<\/strong><\/p>

Cette \u00e9tude se concentre sur la fa\u00e7on dont les caract\u00e9ristiques de corrosion de l'In939 produit par fabrication additive sont similaires \u00e0 celles de l'In939 fabriqu\u00e9 de mani\u00e8re conventionnelle (CM) \u00e0 900\u00b0C, ind\u00e9pendamment de la direction de la surface oxyd\u00e9e par rapport \u00e0 la direction de formation. Les deux mat\u00e9riaux forment une couche de Cr2O3 comme couche d'oxyde protectrice \u00e0 la surface de l'In939.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

High temperature oxidation of Inconel 939 formed by LPBF Introduction Nickel-based super alloys are corrosion-resistant alloys designed for high temperature applications up to 1100 to 1150\u00b0C. Due to their high levels of creep resistance, vulcanization and oxidation, these alloys have been widely used in the aerospace and energy industries. They typically contain up to 10 […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"post_folder":[],"class_list":["post-7694","post","type-post","status-publish","format-standard","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/posts\/7694","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/comments?post=7694"}],"version-history":[{"count":5,"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/posts\/7694\/revisions"}],"predecessor-version":[{"id":7702,"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/posts\/7694\/revisions\/7702"}],"wp:attachment":[{"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/media?parent=7694"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/categories?post=7694"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/tags?post=7694"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/am-material.com\/fr\/wp-json\/wp\/v2\/post_folder?post=7694"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}