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Title: Dual phase magnetic material component and method of forming

A magnetic component having intermixed first and second regions, and a method of preparing that magnetic component are disclosed. The first region includes a magnetic phase and the second region includes a non-magnetic phase. The method includes mechanically masking pre-selected sections of a surface portion of the component by using a nitrogen stop-off material and heat-treating the component in a nitrogen-rich atmosphere at a temperature greater than about C. Both the first and second regions are substantially free of carbon, or contain only limited amounts of carbon; and the second region includes greater than about 0.1 weight % of nitrogen.
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Issue Date:
OSTI Identifier:
General Electric Company DOEEE
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2013 Oct 31
Research Org:
General Electric Company, Niskayuna, NY (United States)
Sponsoring Org:
Country of Publication:
United States

Other works cited in this record:

High strength, austenitic, non-magnetic alloy
patent, October 1978

Rare earth permanent magnet and method for producing the same
patent, June 2000

Composite magnetic member excellent in corrosion resistance and method of producing the same
patent, June 2001

Composite magnetic member, method of producing ferromagnetic portion of same, and method of forming non-magnetic portion of same
patent, July 2001

Method of making a powder metal rotor for a synchronous reluctance machine
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Non-oriented electrical steel sheets with excellent magnetic properties and method for manufacturing the same
patent, December 2010

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journal, May 2002
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journal, May 2003
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journal, January 2003
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journal, February 2011
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  • DOI: 10.1007/s11661-011-0626-y

Analysis of Magnetism in High Nitrogen Austenitic Stainless Steel and Its Elimination by High Temperature Gas Nitriding
journal, December 2011
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