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Canadian Metallurgical Quarterly
The Canadian Journal of Metallurgy and Materials Science
Volume 41, 2002 - Issue 1
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Articles

Precipitation Behaviour of a Grade 100 Structural Steel

Pages 111-119 | Published online: 18 Jul 2013
 

Abstract

The precipitation behaviour of a low carbon microalloyed steel (0.08C, Nb, Ti, V and Mo) was studied by means of scanning and transmission electron microscopy using samples of industrially processed plate. Several types of precipitates, in terms of size and composition, are formed at different stages of processing. Coarse TiN particles of up to 3 microns in size are formed during or soon after casting. Ti-rich and Nb-rich precipitates, 30 to 300 nm in size, are formed during rolling. Niobium carbides, ?10 nm in size, are precipitated during austenite transformation and very fine Nb rich precipitates, ≤5 nm in size, are formed after coiling.

On a étudié le comportement de précipitation d’un acier micro-allié à faible carbone (0.08C, Nb, Ti, V et Mo) à l’aide d’échantillons de tôle traitée industriellement, grâce à la microscopie électronique à balayage et à transmission. Plusieurs sortes de précipités, quant à la taille et à la composition, se forment à différentes étapes du traitement. De grosses particules de TiN, d’une taille jusqu’à 3 microns, se forment lors du moulage ou immédiatement après celui-ci. Des précipités riches en Ti ou en Nb, de 30 à 300 nm, se forment lors du laminage. Des carbures de niobium, d’une taille d’environ 10 nm, sont précipités lors de la transformation de l’austénite et de très petits précipités riches en Nb, d’une taille ≤?5 nm, se forment après l’enroulement.

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