Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1992-08-21
1993-09-07
Roy, Upendra
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
420422, C22C 1600
Patent
active
052425150
ABSTRACT:
This is an improved method of fabricating Zircaloy-4 strip. The method is of the type wherein Zircaloy-4 material is vacuum melted, forged, hot reduced, beta-annealed, quenched, hot rolled, subjected to a post-hot-roll anneal and then reduced by at least two cold rolling steps, including a final cold rolling to final size, with intermediate annealing between the cold rolling steps and with a final anneal after the last cold rolling step. The improvement comprises: (a) utilizing a maximum processing temperature of 620.degree. C. between the quenching and the final cold rolling to final size; (b) utilizing a maximum intermediate annealing temperature of 520.degree. C.; and (c) utilizing hot rolling, post-hot-roll annealing, intermediate annealing and final annealing time-temperature combinations to give an A parameter of between 4.times.10.sup.-19 and 7.times.10.sup.-18 hour, where segment parameters are calculated for the hot rolling step and each annealing step, the segment parameters are calculated by taking the time, in hours, for which that step is performed, to the (-40,000/T) power, in which T is the temperature, in degrees K, at which the step is performed, and where the A parameter is the sum of the segment parameters. Preferably, the hot rolling and the post-hot-roll anneal are at 560.degree.-620.degree. C. and are for 1.5-3 hours and the intermediate annealing is at 400.degree.-520.degree. C. and is for 1.5-15 hours and the final anneal after the last cold rolling step is at 560.degree.-710.degree. C. for 1-5 hours, and the beta-anneal is at 1015.degree.-1130.degree. C. for 2-30 minutes.
REFERENCES:
patent: 4908071 (1990-03-01), Anderson et al.
patent: 4981527 (1991-01-01), Charquet
patent: 4992240 (1991-02-01), Komatsu et al.
Dougherty James P.
Foster John P.
Worcester Samuel A.
Roy Upendra
Valentine J. C.
Westinghouse Electric Corp.
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