Method of preparing a magnetic article from a duplex ferromagnet

Details Method of preparing a magnetic article from a duplex ferromagnet Method of preparing a magnetic article from a duplex ferromagnet

1996-01-31

1997-11-11

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148121, H01F 100

Patent

active

056859210

ABSTRACT:
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, H.sub.c, of at least 30 Oe.

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