zircalloy - 4 - processing techniques to obtain corrosion resistance against uniform corrosion and lochfrass.

摘要

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 and 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 is characterized by the steps of: (a) utilizing a maximum processing temperature of 620 DEG C between the quenching and the final cold rolling to final size; (b) stress relief annealing at a maximum intermediate annealing temperature of 520 DEG 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 x 10-19 and 7 x 10-18 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, times the exponent of (-40,000/T), 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 560-620 DEG C and are for 1.5-3 hours and the intermediate annealing is at 400-520 DEG C and is for 1.5-15 hours and the final anneal after the last cold rolling step is at 560-710 DEG C for 1-5 hours, and the beta-anneal is at 1015-1130 DEG C for 2-30 minutes. IMAGE