Method of preparing a magnetic article from a duplex...

C - Chemistry – Metallurgy – 21 – D

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C21D 8/12 (2006.01) C21D 6/00 (2006.01) H01F 1/147 (2006.01)

Patent

CA 2243502

A process for preparing a duplex ferromagnetic alloy article is disclosed. The process includes the step of providing an elongated intermediate form of a ferromagnetic alloy having a substantially fully martensitic structure. The martensitic intermediate form undergoes an aging heat treatment under conditions of temperature and time that are selected to cause controlled precipitation of austenite in the martensitic alloy. The aged article is then cold-worked to a final cross-sectional dimension, preferably in a single reduction step, to provide an anisotropic structure and a coercivity, Hc, of at least 30 Oe.

Procédé de préparation d'un article en alliage ferromagnétique duplex. Le procédé comprend l'étape de production d'une forme intermédiaire allongée en alliage ferromagnétique présentant une structure totalement martensitique. La forme intermédiaire martensitique subit un traitement thermique de vieillissement dans des conditions de température et de temps sélectionnées pour provoquer une précipitation régulée d'austénite dans l'alliage martensitique. L'article vieilli est ensuite travaillé à froid dans une seule dimension de coupe transversale finale, de préférence en une seule étape de réduction, afin d'obtenir une structure anisotrope et une coersivité, H¿c?, d'au moins 30 Oe.

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