Process for heat treatment of a metal workpiece

Details Process for heat treatment of a metal workpiece Process for heat treatment of a metal workpiece

1981-09-30

1983-10-18

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 203, 148131, 148138, 432 15, 432 28, C21D 516, C21D 153

Patent

active

044103735

ABSTRACT:
A process for heat treatment of a metal workpiece, such as a casting (steel, aluminum based alloy or white cast iron). The casting is heated in a fluidized particulate bed (sand) to a relatively constant first temperature. Then, the casting is held (e.g., 3 hours) tightly packed against shape changes in the unfluidized bed until internal structural changes have occurred. Next, the casting is cooled in a fluidized particulate bed (sand) to a relatively constant second temperature. Then, the casting is held (e.g., 3 hours) tightly packed in the unfluidized bed until the desired internal structural changes are completed. The casting is removed from the bed for utilization as a heat treated product.

REFERENCES:
patent: 1042999 (1912-10-01), Burian
patent: 3053704 (1962-09-01), Munday
patent: 3099589 (1963-07-01), Tanaka
patent: 3197328 (1965-07-01), Jung et al.
patent: 3197346 (1965-07-01), Munday
patent: 3336167 (1967-08-01), Tanaka
patent: 3397873 (1968-08-01), Ritchie et al.
patent: 3524633 (1970-08-01), Schiller
patent: 4013279 (1977-03-01), Virr
patent: 4222429 (1980-09-01), Kemp
patent: 4249889 (1981-02-01), Kemp

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