Intercritical-cycle annealing

Details Intercritical-cycle annealing Intercritical-cycle annealing

1975-02-13

1977-06-28

Lovell, C.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

C21D 100

Patent

active

040323684

ABSTRACT:
Hypoeutectoid steel is heated to an intercritical temperature to produce a microstructure of about 30-50% austenite. The steel is then cooled as rapidly as feasible to a temperature below A.sub.s and held at temperature to transform the austenitic portion. Such transformation may occur either in the minimum of the pearlite region (.about.1200.degree. F) or in the bainite region (.about.800.degree. F).

REFERENCES:
patent: 1733669 (1929-10-01), Makita
patent: 2563672 (1951-08-01), Boyce
patent: 2664369 (1953-12-01), Kiefer
patent: 2779698 (1957-01-01), Boughman et al.
patent: 3028270 (1962-04-01), Morita
patent: 3178324 (1965-04-01), Grange et al.
patent: 3288657 (1966-11-01), Morita et al.
patent: 3370994 (1968-02-01), Konkol
patent: 3732127 (1973-05-01), Furgason
Metals Handbook, 8th ed., 1964, pp. 56-64.

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