Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1979-07-05
1981-04-21
Skiff, Peter K.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148 38, C21D 100
Patent
active
042630630
ABSTRACT:
Duplex stainless steel materials containing austenite plus delta ferrite, are dimensionally stabilized by heating the material to a reaction temperature between about 1050.degree.-1450.degree. F. (566.degree.-788.degree. C.), holding it at this temperature during transformation of delta ferrite to austenite plus sigma phase, and subsequently heating to a reversion temperature between about 1625.degree.-1750.degree. F. (885.degree.-954.degree. C.), whereby the sigma phase transforms back to ferrite, but the austenite remains dispersed in the ferrite phase. Final controlled cooling permits transformation of ferrite to austenite plus sigma and, later, precipitation of carbides.
REFERENCES:
patent: 2486283 (1949-10-01), Hoffman
patent: 2686116 (1954-08-01), Schempp
patent: 2873187 (1959-02-01), Dyrkacz et al.
patent: 3776720 (1973-12-01), Dudek
patent: 3944442 (1976-03-01), Donachie
patent: 4127428 (1978-11-01), Izumiyama et al.
Hull Frederick C.
Tobin John C.
Constant Richard E.
Denny James E.
Skiff Peter K.
Southworth III Robert
The United States of America as represented by the United States
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