Method of treating ZR-Base alloys to improve post irradiation du

Details Method of treating ZR-Base alloys to improve post irradiation du Method of treating ZR-Base alloys to improve post irradiation du

1975-05-19

1976-12-28

Steiner, Arthur J.

Metal treatment

Compositions

Heat treating

75177, 148133, 176 91R, C22F 100

Patent

active

040000133

ABSTRACT:
A zirconium base alloy is produced, having improved ductility after irradiation with fast neutrons, by heating in a protective atmosphere a zirconium base alloy containing precipitates in the form of at least one alloying element (e.g. Nb, Mo, Ni or Cr), which is soluble with the zirconium in the .beta. phase and insoluble therewith in the .alpha. phase, until the precipitates have dissolved, water quenching the zirconium base alloy to produce a fine martensitic structure supersaturated with the or each alloying element, working the zirconium base alloy in steps reducing the cross-sectional area 10% to 20% of the original cross-section, with annealing below recrystallization temperature for at least 10 minutes in the .alpha. phase between steps, until a total reduction of 70%-75% of the original cross-section is achieved, and then annealing the zirconium base alloy so that simultaneous recrystallization and precipitation of the or each alloying element occurs. An alloy is produced having an average grain diameter of 0.1-0.5 microns which is particularly useful for nuclear fuel sheathing. An example of the procedure for a zirconium base niobium alloy is given.

REFERENCES:
patent: 3287111 (1966-11-01), Klepfer
patent: 3341373 (1967-09-01), Evans
patent: 3427210 (1969-02-01), Varese
patent: 3431104 (1969-03-01), Klepfer
patent: 3567522 (1971-03-01), Thomas et al.
patent: 3645800 (1972-02-01), Mock

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