{"id":5596,"date":"2020-02-10T06:46:10","date_gmt":"2020-02-10T06:46:10","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=5596"},"modified":"2025-09-19T05:32:56","modified_gmt":"2025-09-19T05:32:56","slug":"quel-est-lequilibre-ideal-des-phases-pour-le-soudage-de-tubes-en-acier-inoxydable-duplex","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/fr\/blog\/quel-est-lequilibre-ideal-des-phases-pour-le-soudage-de-tubes-en-acier-inoxydable-duplex\/","title":{"rendered":"Quel est l'\u00e9quilibre de phase id\u00e9al pour le soudage duplex de tuyaux en acier inoxydable\u00a0?"},"content":{"rendered":"

Bilan de phase du soudage duplex de tubes en acier inoxydable<\/h2>\n

On dit souvent que l'\u00e9quilibre des phases de l'acier inoxydable duplex est \"50-50\", ce qui correspond \u00e0 la quantit\u00e9 d'aust\u00e9nite et de ferrite. Strictement parlant, c'est incorrect car la teneur en ferrite dans l'acier inoxydable duplex moderne est d'environ 40% -50%, le reste \u00e9tant de l'aust\u00e9nite.<\/p>\n

\"Bilan<\/a><\/p>\n

On pense g\u00e9n\u00e9ralement que lorsque la teneur en ferrite est d'au moins 25-30% et que le reste est de l'aust\u00e9nite, tuyau duplex<\/a> a des avantages uniques.<\/p>\n

Dans certaines m\u00e9thodes de soudage, en particulier dans la m\u00e9thode de protection du flux pour tuyau duplex 2205<\/a>, en ajustant l'\u00e9quilibre des phases, la teneur en aust\u00e9nite dans la soudure peut atteindre un niveau plus \u00e9lev\u00e9, am\u00e9liorant ainsi la t\u00e9nacit\u00e9 de la soudure et compensant la teneur en oxyg\u00e8ne de la soudure caus\u00e9e par le flux Perte de t\u00e9nacit\u00e9 accrue.<\/p>\n

La t\u00e9nacit\u00e9 de ces m\u00e9taux d'apport apr\u00e8s mise en solution est bien inf\u00e9rieure \u00e0 celle des t\u00f4les d'acier ou des tubes d'acier, mais la t\u00e9nacit\u00e9 du m\u00e9tal d'apport est encore suffisante pour r\u00e9pondre aux exigences attendues.<\/p>\n

Aucune m\u00e9thode de soudage ne peut faire en sorte que la t\u00e9nacit\u00e9 du m\u00e9tal fondu atteigne la hauteur du m\u00e9tal forg\u00e9 apr\u00e8s un recuit complet. Si la teneur en ferrite du m\u00e9tal d\u00e9pos\u00e9 est limit\u00e9e au minimum requis pour le recuit de l'acier inoxydable duplex dans le laminoir, la m\u00e9thode de soudage disponible impose des restrictions inutiles.<\/p>\n

L'\u00e9quilibre de phase de la zone affect\u00e9e thermiquement, c'est-\u00e0-dire l'acier forg\u00e9 d'origine ou tuyau en acier inoxydable<\/a> plus un cycle thermique de soudage suppl\u00e9mentaire, est g\u00e9n\u00e9ralement l\u00e9g\u00e8rement plus \u00e9lev\u00e9 que le mat\u00e9riau d'origine. Il est presque impossible de d\u00e9terminer l'\u00e9quilibre de phase de la zone affect\u00e9e thermiquement par une m\u00e9thode m\u00e9tallographique.<\/p>\n

Si la teneur en ferrite dans cette r\u00e9gion est \u00e9lev\u00e9e, cela peut indiquer une condition anormale de refroidissement extr\u00eamement rapide, ce qui entra\u00eene une teneur excessive en ferrite et une t\u00e9nacit\u00e9 r\u00e9duite.<\/p>\n

Vous voudrez peut-\u00eatre aussi lire :
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