{"id":73795,"date":"2024-11-12T15:53:09","date_gmt":"2024-11-12T13:53:09","guid":{"rendered":"https:\/\/unm.fr\/?p=73795"},"modified":"2024-11-12T15:57:25","modified_gmt":"2024-11-12T13:57:25","slug":"aciers-essai-de-trempabilite-et-determination-micrographique","status":"publish","type":"post","link":"https:\/\/unm.fr\/en\/standards-of-the-month\/aciers-essai-de-trempabilite-et-determination-micrographique\/","title":{"rendered":"Aciers\u00a0: essai de trempabilit\u00e9 et d\u00e9termination micrographique"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"73795\" class=\"elementor elementor-73795\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8930938 e-flex e-con-boxed e-con e-parent\" data-id=\"8930938\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e65c014 elementor-widget elementor-widget-text-editor\" data-id=\"e65c014\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Les normes NF EN ISO 642 <em>Acier \u2014 Essai de trempabilit\u00e9 par trempe en bout (Essai Jominy)<\/em>\u00a0 et NF EN ISO 643 <em>Aciers \u2014 D\u00e9termination micrographique de la grosseur de grain apparente<\/em>\u00a0 apr\u00e8s pr\u00e8s de cinq ann\u00e9es de r\u00e9vision voient enfin le jour\u00a0! Ces nouvelles \u00e9ditions, d\u00e9velopp\u00e9es au sein de l\u2019ISO\/TC 17\/SC 7\/WG 2, ont fait l\u2019objet d\u2019importantes modifications techniques.<\/p><p>La cinqui\u00e8me \u00e9dition de la NF EN ISO 643 remplace l\u2019\u00e9dition de 2020. Cette nouvelle version contient \u00e0 nouveau des images-types pour la d\u00e9termination de la grosseur de grain. Ces nouvelles images ont d\u00fb \u00eatre enti\u00e8rement pr\u00e9par\u00e9es et valid\u00e9es par le Sous-comit\u00e9 pour correspondre aux versions ant\u00e9rieures. Enfin, de nouvelles Annexes sur le calcul de la grosseur de grain et de l\u2019intervalle et les grains de diff\u00e9rents indices de grosseur ont \u00e9t\u00e9 ajout\u00e9es.<\/p><p>Quant \u00e0 la nouvelle \u00e9dition de la NF EN ISO 642, la troisi\u00e8me, elle remplace celle de 1999. Comme changements importants, nous pouvons noter la refonte de l\u2019\u00e9chantillonnage avec l\u2019ajout du ratio de r\u00e9duction minimum recommand\u00e9 de 5:1 et la modification des dimensions de l\u2019\u00e9prouvette. De plus, les exigences en mati\u00e8re de traitement thermique, la configuration du dispositif de fixation et de centrage et la codification des r\u00e9sultats d&#8217;essais ont \u00e9galement \u00e9t\u00e9 r\u00e9vis\u00e9es.<\/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\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Les normes NF EN ISO 642 Acier \u2014 Essai de trempabilit\u00e9 par trempe en bout (Essai Jominy)  et NF EN ISO 643 Aciers \u2014 D\u00e9termination micrographique de la grosseur de grain apparente  apr\u00e8s pr\u00e8s de cinq ann\u00e9es de r\u00e9vision voient enfin le jour ! Ces nouvelles \u00e9ditions, d\u00e9velopp\u00e9es au sein de l\u2019ISO\/TC 17\/SC 7\/WG 2, ont fait l\u2019objet d\u2019importantes modifications techniques.<\/p>\n","protected":false},"author":8,"featured_media":73748,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"date-de-webinaire":0,"heure-webinaire":"","duree-webinaire":"","lien-bouton-cta":"","footnotes":""},"categories":[38],"tags":[],"normes-associees":[3519,3520],"thematique":[79],"class_list":["post-73795","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-focus-norme","normes-associees-en-iso-642","normes-associees-en-iso-643","thematique-acier"],"_links":{"self":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts\/73795","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/comments?post=73795"}],"version-history":[{"count":4,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts\/73795\/revisions"}],"predecessor-version":[{"id":73799,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/posts\/73795\/revisions\/73799"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/media\/73748"}],"wp:attachment":[{"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/media?parent=73795"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/categories?post=73795"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/tags?post=73795"},{"taxonomy":"normes-associees","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/normes-associees?post=73795"},{"taxonomy":"thematique","embeddable":true,"href":"https:\/\/unm.fr\/en\/wp-json\/wp\/v2\/thematique?post=73795"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}