Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1984-04-02
1985-10-01
Skiff, Peter K.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148144, C21D 118
Patent
active
045444226
ABSTRACT:
A microalloy-free, high strength, low alloy, low carbon, manganese steel characterized by a dual phase microstructure wherein acicular retained austenite particles are distributed within a ferrite matrix. The ferrite-austenite microstructure is produced by a heat treatment comprising heating the steel above the upper critical austenite transformation temperature to produce an austenite microstructure; quenching to produce a lath martensite microstructure; tempering at a temperature below the lower critical austenite transformation temperature to partition carbon and manganese to form cementite particles and to transform the martensite to ferrite, thereby producing a microstructure comprising cementite particles dispersed within a ferrite matrix; annealing at an intercritical temperature to decompose the cementite and produce austenite particles; and quenching to retain the austenite particles within the ferrite matrix.
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Fekete Douglas D.
General Motors Corporation
Skiff Peter K.
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