Interrupted normalization heat treatment process

Details Interrupted normalization heat treatment process Interrupted normalization heat treatment process

1992-03-03

1992-12-29

Andrews, Melvyn J.

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148641, 148663, C21D 120

Patent

active

051748363

ABSTRACT:
An interrupted normalization heat treatment process for ferritic alloy steel that includes the steps of rapidly cooling at least the outer surfaces of the steel from a temperature above the Ac.sub.3, temperature to a temperature below the Ar.sub.1, temperature and during subsequent air cooling to room temperature reheating the outside surfaces of the ferritic alloy steel back above the Ar.sub.1, temperature by bleed back heat from the steel, tempering the air cooled workpiece, and forming an as interrupting normalized workpiece having substantially bainitic structures.

REFERENCES:
patent: 4016009 (1977-04-01), Economopoulos et al.
patent: 4204892 (1980-05-01), Economopoulos
patent: 4295902 (1981-10-01), Economopoulos

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