Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1976-12-28
1978-07-04
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148155, 148158, 148159, 214 1BD, 214152, C21D 118, C22F 104, C22F 118
Patent
active
040986241
ABSTRACT:
An isothermal transformation process or method is disclosed for heat treating metals of the class which is characterized by having a time-temperature-transformation, or T-T-T Diagram or Isothermal Transformation Diagram. The process includes the steps of heating the metal workpiece at a heating source or station to a temperature above the solution treating transformation or austenitizing temperature (A.sub.1) where the workpiece is formed into a homogeneous solid solution; thereafter encapsulating the workpiece in a generally closed container which maintains the temperature of the workpiece above the aforesaid solution treating transformation or austenitizing temperature during the period of time required to physically transport the container and the workpiece therein from the heating source or station to a cooling source or station; transporting the container with the workpiece therein to the cooling source or station; removing the workpiece from the container; and immediately inserting the workpiece which still has a temperature above the solution treating transformation or austenitizing temperature into a cooling source or station which thereafter performs the isothermal transformation of the workpiece and where the homogeneous solid solution is converted by cooling to the desired mixed solids.
REFERENCES:
patent: 2862843 (1958-12-01), Engelhard
patent: 3459313 (1969-08-01), Upton et al.
patent: 3558367 (1971-01-01), Eck
Dean R.
Upton Industries, Inc.
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