{"id":13503,"date":"2026-01-20T16:10:17","date_gmt":"2026-01-20T16:10:17","guid":{"rendered":"https:\/\/ipsenglobal.com\/?post_type=knowledge-center&p=13503"},"modified":"2026-03-11T16:24:17","modified_gmt":"2026-03-11T16:24:17","slug":"hardening-and-heat-treating","status":"publish","type":"knowledge-center","link":"https:\/\/ipsenglobal.com\/fr\/knowledge-center\/hardening-and-heat-treating\/","title":{"rendered":"Durcissement par traitement thermique : Comment les m\u00e9taux gagnent en r\u00e9sistance et en durabilit\u00e9"},"content":{"rendered":"
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Les \u00c9chelle de duret\u00e9 Rockwell<\/strong> est une mesure de la r\u00e9sistance d'un mat\u00e9riau \u00e0 la p\u00e9n\u00e9tration ou \u00e0 la d\u00e9formation permanente lorsqu'il est soumis \u00e0 la force d'un autre mat\u00e9riau. P\u00e9n\u00e9trations<\/strong> comprennent des ruptures de surface, telles que des coups de poing ou des rayures. D\u00e9formations permanentes<\/strong> comprennent des bosses, des d\u00e9formations ou des fractures par compression.<\/p>\n\n\n\n

Lors de l'usinage d'un outil m\u00e9tallique, tel qu'une matrice ou un outil de coupe, le mat\u00e9riau brut doit \u00eatre suffisamment mall\u00e9able pour \u00eatre coup\u00e9 ou fa\u00e7onn\u00e9 dans sa forme fonctionnelle finale. Les meilleurs mat\u00e9riaux \u00e0 ce stade du processus ont une duret\u00e9 Rockwell inf\u00e9rieure \u00e0 celle des outils de coupe et de fa\u00e7onnage utilis\u00e9s pour les former.<\/p>\n\n\n\n

Une fois qu'une pi\u00e8ce a atteint sa forme finale, elle doit \u00eatre suffisamment dure pour conserver cette forme pendant toute la dur\u00e9e de son utilisation. Par exemple, les surfaces des pistons de moteur doivent \u00eatre suffisamment dures pour r\u00e9sister \u00e0 des milliards de petites explosions et \u00e0 la friction du mouvement \u00e0 l'int\u00e9rieur des cylindres du moteur pendant toute leur dur\u00e9e de vie. Ces mat\u00e9riaux doivent avoir une cote \u00e9lev\u00e9e sur l'\u00e9chelle de duret\u00e9 Rockwell.<\/p>\n\n\n\n

Trempe<\/strong>, Le traitement thermique est l'\u00e9tape cruciale qui fait passer les mat\u00e9riaux m\u00e9talliques de la mall\u00e9abilit\u00e9 et de l'usinabilit\u00e9 \u00e0 la durabilit\u00e9 et \u00e0 la r\u00e9sistance \u00e0 la p\u00e9n\u00e9tration et \u00e0 la d\u00e9formation.<\/p>\n\n\n\n

La trempe par traitement thermique consiste \u00e0 appliquer \u00e0 une pi\u00e8ce m\u00e9tallique une chaleur suffisante pour en transformer la structure interne. structure du r\u00e9seau cristallin<\/strong> (voir encadr\u00e9), <\/em>ce qui le rend plus r\u00e9sistant \u00e0 la p\u00e9n\u00e9tration et \u00e0 la d\u00e9formation. Le processus aboutit \u00e0 une structure interne du r\u00e9seau cristallin qui pr\u00e9sente des plans de cisaillement<\/strong>.2<\/sup><\/p>\n\n\n\n

Plans de cisaillement<\/strong>, <\/strong>occasionnellement \u00e9galement connu sous le nom de splans labiaux<\/em>, Les plans de cisaillement sont des zones d'un mat\u00e9riau solide o\u00f9 des groupes d'atomes ou de mol\u00e9cules peuvent facilement glisser les uns sur les autres. Ces plans de cisaillement repr\u00e9sentent des faiblesses, l\u00e0 o\u00f9 les d\u00e9formations ou les p\u00e9n\u00e9trations sont les plus susceptibles de se produire.<\/p>\n\n\n

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\"crystalline
Fig. 1 - Source : <\/em>Flexbooks<\/em><\/a><\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n
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La structure cristalline des m\u00e9taux<\/h4>\n\n\n\n

Tous les \u00e9l\u00e9ments m\u00e9talliques connus, \u00e0 l'exception du mercure, sont solides et cristallins \u00e0 temp\u00e9rature ambiante. Les m\u00e9taux et leurs alliages ont une forte tendance \u00e0 se cristalliser, les atomes \u00e9tant dispos\u00e9s de mani\u00e8re ordonn\u00e9e et r\u00e9p\u00e9titive plut\u00f4t que de mani\u00e8re al\u00e9atoire.

La structure cristalline de la plupart des m\u00e9taux \u00e0 temp\u00e9rature ambiante est de l'un des trois types suivants : cubique centr\u00e9 sur le corps (BCC), cubique centr\u00e9 sur la face (FCC) ou hexagonal serr\u00e9 (HCP).1 <\/sup>

Ces structures cristallines influencent la facilit\u00e9 avec laquelle les atomes peuvent se d\u00e9placer les uns par rapport aux autres, ce qui affecte la r\u00e9sistance, la ductilit\u00e9 et le comportement de d\u00e9formation du m\u00e9tal lorsqu'une force est appliqu\u00e9e.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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\"sheer
Fig. 2 - Source : <\/em>\u00c9tude sur la fabrication de barres d\u00e9form\u00e9es chez Elite Iron and Steel Industries, Razin Sazzad Molla<\/em><\/a><\/figcaption><\/figure>\n\n\n\n
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Quelle est la diff\u00e9rence entre la c\u00e9mentation et la trempe ?<\/h3>\n\n\n\n

Il existe deux m\u00e9thodes de trempe que les traiteurs thermiques utilisent fr\u00e9quemment pour augmenter la duret\u00e9 des m\u00e9taux. c\u00e9mentation<\/strong> et sous trempe durcissement<\/strong>.<\/p>\n\n\n\n

C\u00e9mentation<\/h4>\n\n\n\n
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La c\u00e9mentation est la diffusion d'un ou plusieurs \u00e9l\u00e9ments \u00e0 haute temp\u00e9rature dans un m\u00e9tal. Ces \u00e9l\u00e9ments perturbent l'uniformit\u00e9 d'un r\u00e9seau cristallin, ce qui peut modifier la forme d'une ligne ou d'un plan plat dans un mat\u00e9riau uniforme en quelque chose de plus irr\u00e9gulier.3<\/sup> <\/p>\n\n\n\n

Ces proc\u00e9d\u00e9s sont utilis\u00e9s le plus souvent avec des m\u00e9taux ferriques tels que l'acier. La c\u00e9mentation, la nitruration et la carbonitruration sont les versions les plus courantes de la c\u00e9mentation.<\/p>\n\n\n\n

La plupart du temps, la c\u00e9mentation a lieu dans fours \u00e0 atmosph\u00e8re<\/a>, comme un Ipsen Atlas<\/a> four. Les pi\u00e8ces entrent dans le four et sont chauff\u00e9es \u00e0 une temp\u00e9rature o\u00f9 le gaz de traitement peut diffuser des \u00e9l\u00e9ments tels que le carbone, l'azote, ou les deux, dans le m\u00e9tal de surface des pi\u00e8ces. Pour ce faire, des gaz de traitement tels que l'ac\u00e9tyl\u00e8ne, l'ammoniac, le dioxyde de carbone ou le monoxyde de carbone sont introduits dans le syst\u00e8me. Parfois, de l'hydrog\u00e8ne est introduit pour \u00e9liminer les oxydes de surface afin d'obtenir une liaison plus efficace. <\/p>\n\n\n\n

Dans certains cas, la c\u00e9mentation n\u00e9cessite l'utilisation d'un four \u00e0 vide<\/a>. Parmi les exemples, on peut citer les pi\u00e8ces qui exigent une grande propret\u00e9, une duret\u00e9 de c\u00e9mentation uniforme ou des g\u00e9om\u00e9tries complexes. L'une de ces m\u00e9thodes de c\u00e9mentation dans un four sous vide est la suivante Ipsen Avac\u00ae<\/sup><\/a> la c\u00e9mentation \u00e0 basse pression.<\/p>\n\n\n\n

\n \n Demande de devis pour un four \u00e0 vide ou un four atmosph\u00e9rique <\/a>\n <\/section>\n<\/div>\n\n\n\n
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Fig. 3 - Source : <\/em>Le fabricant<\/em><\/a><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

Trempe durcissement<\/h4>\n\n\n\n

Le durcissement par trempe n'est pas obtenu en ajoutant de la mati\u00e8re \u00e0 un m\u00e9tal, mais en augmentant la temp\u00e9rature du m\u00e9tal jusqu'\u00e0 ce que la structure du r\u00e9seau cristallin atteigne l'\u00e9tat d'aust\u00e9nite, puis en trempant rapidement le mat\u00e9riau jusqu'\u00e0 ce qu'il s'installe dans un \u00e9tat cristallin de martensite. Ce processus de trempe doit \u00eatre suffisamment rapide pour \u00e9viter la formation d'autres structures cristallines, telles que la ferrite, la perlite et la bainite.4<\/sup><\/p>\n\n\n\n

La trempe peut \u00eatre r\u00e9alis\u00e9e \u00e0 la fois dans des fours sous vide et dans des fours \u00e0 atmosph\u00e8re, bien que seuls les alliages \u00e0 forte teneur en \u00e9l\u00e9ments d'alliage puissent \u00eatre tremp\u00e9s sous vide.<\/p>\n\n\n\n

La trempe peut \u00eatre effectu\u00e9e \u00e0 l'aide d'une solution de trempe liquide, telle que de l'huile, du sel ou de l'eau, ou \u00e0 l'aide d'un gaz non r\u00e9actif circulant \u00e0 haute pression, tel que l'argon ou l'azote. Bien que certains fours \u00e0 vide, tels que le Ipsen LOG<\/strong> Fourneau<\/strong>5<\/sup>, La plupart des fours \u00e0 vide n'utilisent que du gaz sous pression pour la trempe.<\/p>\n\n\n\n

Fours sous vide \u00e0 trempe gazeuse<\/a> sont g\u00e9n\u00e9ralement class\u00e9s en fonction de leur capacit\u00e9 de pression. La plupart des fours Ipsen peuvent fournir une pression de trempe de 2 \u00e0 20 bars. \u00c0 titre indicatif, tripler la pression peut r\u00e9duire de moiti\u00e9 le temps de trempe ; le gaz a plus de mol\u00e9cules pour absorber la chaleur des pi\u00e8ces et de la chambre. Toutefois, \u00e0 un certain moment, la trempe au gaz \u00e0 haute pression ne peut pas atteindre la vitesse d'une trempe au liquide de mani\u00e8re aussi efficace, c'est pourquoi les pressions de trempe au gaz d\u00e9passent rarement 20 bars.<\/p>\n\n\n\n

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\"hardening\"\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button>
Fig. 4 - Source : <\/em>Durcissement par transformation - nuclear-power.com<\/em><\/a><\/figcaption><\/figure>\n<\/div>\n\n\n\n
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\"Ipsen
Fig. 5 - Four Ipsen LOG<\/em><\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

La duret\u00e9 n'est pas la t\u00e9nacit\u00e9 : Pourquoi le revenu est-il si important ?<\/h3>\n\n\n\n

Maximiser la duret\u00e9 d'un mat\u00e9riau n'est pas toujours la meilleure solution pour une longue dur\u00e9e de vie. Les m\u00e9taux trop durs, en particulier ceux dont la section transversale est fine, peuvent devenir cassants.<\/p>\n\n\n\n

C'est pourquoi de nombreux processus de trempe n\u00e9cessitent un traitement secondaire. trempe<\/strong> processus. Le revenu permet de chauffer les pi\u00e8ces \u00e0 des temp\u00e9ratures sous-critiques, puis d'appliquer un processus de trempe plus lent. Ce processus r\u00e9duit l\u00e9g\u00e8rement la duret\u00e9 tout en lib\u00e9rant les contraintes et les fissures microscopiques qui peuvent se former lors d'une trempe rapide ou d'un processus de durcissement.<\/p>\n\n\n\n

Le revenu r\u00e9duit la fragilit\u00e9 et augmente la t\u00e9nacit\u00e9 de la pi\u00e8ce, permettant juste assez de flexibilit\u00e9 dans le r\u00e9seau cristallin pour que la pi\u00e8ce reprenne sa forme apr\u00e8s l'application d'une compression ou d'une force de perforation.<\/p>\n\n\n\n

Les cycles de trempe \u00e9tant g\u00e9n\u00e9ralement plus longs que les cycles de durcissement, les traiteurs thermiques ex\u00e9cutent souvent les recettes de trempe dans des fours distincts afin de maximiser le rendement global de la production.<\/p>\n\n\n\n

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Pour en savoir plus sur la m\u00e9tallurgie qui sous-tend la trempe et le traitement thermique, participez \u00e0 une prochaine conf\u00e9rence sur la trempe et le traitement thermique. Ipsen U<\/a> classe.<\/em><\/p>\n\n\n\n

Si vous recherchez un four pour vos besoins de trempe, contactez-nous. <\/em>sales@ipsenusa.com<\/em><\/a>.<\/p>\n\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

L'\u00e9chelle de duret\u00e9 Rockwell est une mesure de la r\u00e9sistance d'un mat\u00e9riau \u00e0 la p\u00e9n\u00e9tration ou \u00e0 la d\u00e9formation permanente lorsqu'il est soumis \u00e0 la force d'un autre mat\u00e9riau. Les p\u00e9n\u00e9trations comprennent les ruptures de surface, telles que les coups de poing ou les coups d'\u00e9p\u00e9e.<\/p>","protected":false},"author":7,"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"_tec_requires_first_save":true,"_searchwp_excluded":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"_tribe_blocks_recurrence_rules":"","_tribe_blocks_recurrence_description":"","_tribe_blocks_recurrence_exclusions":"","_ecp_custom_2":"","footnotes":""},"categories":[7],"tags":[],"class_list":["post-13503","knowledge-center","type-knowledge-center","status-publish","hentry","category-technical-article"],"acf":[],"yoast_head":"\nHardening Through Heat Treating- Ipsen Global<\/title>\n<meta name=\"description\" content=\"Learn how heat treating hardens metals, from Rockwell hardness and crystal structures to case hardening, quenching, and tempering.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ipsenglobal.com\/fr\/knowledge-center\/hardening-and-heat-treating\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hardening Through Heat Treating- Ipsen Global\" \/>\n<meta property=\"og:description\" content=\"Learn how heat treating hardens metals, from Rockwell hardness and crystal structures to case hardening, quenching, and tempering.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ipsenglobal.com\/fr\/knowledge-center\/hardening-and-heat-treating\/\" \/>\n<meta property=\"og:site_name\" content=\"Ipsen 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