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- W2077428809 abstract "The discovery of Ductile Iron (DI) in 1948 provided new growth markets to the iron foundry industry. Precipitating the graphite phase as nodules in a continuous “pseudo-steel” matrix provided the mechanical strength and impact toughness lacking in gray cast irons. This new class of engineering materials was well suited to replace steel castings, forgings and assemblies, resulting in a North American production level exceeding four million tons (including pipe) of DI in 1995. This market growth was concurrent with the development of a family of materials which found applications in most industrial fields.Austempered Ductile Irons (ADI) are the most recently developed materials of the DI family. By adapting the austempering treatment initially introduced for steels to DI, it has been shown that the resulting metallurgical structures provide properties that favorably compare to those of steel while taking advantage of a near-net-shape manufacturing process. The objectives of this paper are to review the metallurgical aspects of ADI production and to discuss the effects of chemical composition, heat treatment variables and initial casting quality on the structure and properties of ADI castings. © 1998 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd. All rights reserved. Résumé La découverte de la fonte à graphite spheroldal (GS) en 1948 a ouvert de nouvelles possibiliti é s de croissance à l'industrie de la fonderie. La pr é cipitation du graphite sous forme de nodules dans une matrice “pseudo-acier” en fait une fonte possédant la résistance mécanique et la ténacit émanquant aux fontes grises. Cette nouvelle catégorie de matériaux était particulierement bien adaptée pour remplacer les pieces d'acier coulees, forg é es ou soudées, ce qui a permis d'atteindre, en 1995, une production nordamericaine de fonte. GS depassant quatre millions de tonnes (incluant les tuyaux). Cette croissance du march é s'est accompagnee du developpement d'une famille de materiaux ayant trouve des applications dans tous les domaines de l'industrie.Les fontes GS trait é es par “austempering” (ADI) représentent les dernieres n é es dela famille des fonts GS. En adaptant le traitement “d'austempering” initialement développé pour les aciers aux fontes GS, les structures métallurgiques obtenues ont permis d'atteindre des propriétés qui se comparent favorablement à celles de l'acier, tout en prenant avantage du pro cédéde fonderie. Les objectifs de cet article sont de revoir les aspects metallurgiques de la production de la fonte ADI et de discuter les effets de la composition chimique, des parametres de traitement thermique et de la qualité de la pièce coulée sur la structure et les propriétés de l'ADI. © 1998 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd. All rights reserved." @default.
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- W2077428809 date "1997-12-01" @default.
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- W2077428809 title "Effect of composition and heat treatment parameters on the characteristics of austempered ductile irons" @default.
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- W2077428809 doi "https://doi.org/10.1016/s0008-4433(97)00028-1" @default.
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