C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
38/19, 148/28
C21D 1/09 (2006.01) C21D 1/34 (2006.01) C21D 9/08 (2006.01) C21D 11/00 (2006.01) H05B 6/02 (2006.01)
Patent
CA 1265419
ABSTRACT OF THE DISCLOSURE Apparatus and process for selectively heat treating at least a portion of an article in the field with auto- regulated heating. The autoregulated heating is provided by a heater including at least a first magnetic material disposed along the portion of the article to be heat treated. The first magnetic material has a magnetic permeability which sharply changes at temperatures at or near the autoregulating (AR) temperature thereof. The changes in permeability result. in corresponding changes in the skin depth of the first magnetic material and, hence, the heating produced therein responsive to a.c. current passing therethrough. By maintaining the a.c. current constant in amplitude and frequency, the first magnetic material and the portion of the article are regulated at substantially the AR temperature of the first magnetic material. By selecting the first magnetic material to have AR temperature substantially corresponding to the tempera- ture at which metal anneals, tempers, hardens, softens, stress relieves or the like, heat treating at an autoregulated temperature is achieved. The autoregulated heater can be incorporated into the article or can be applied to the article thereafter, in each case permitting in field heat treating. Autoregulated heating can also be achieved by any of various multilayer structures to provide desired autoregulation effects.
475792
Busch Paul F.
Derbyshire Rodney L.
Bereskin & Parr
Metcal Inc.
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