Low in reactor creep ZR-base alloy tubes

Details Low in reactor creep ZR-base alloy tubes Low in reactor creep ZR-base alloy tubes

1981-06-29

1984-06-05

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 127B, C22F 118

Patent

active

044526482

ABSTRACT:
A process for fabricating tubes from a quaternary 3.5% Sn, 1% Mo, 1% Nb balance Zr alloy by hot extrusion, cold working and heat treatment so that the tubes have small grains that have low dislocation densities. The tubes are superior to the standard cold worked Zr-2.5 wt % Nb tubes because during service in CANDU-PHW reactors they (a) have lower axial elongation and diametral expansion and (b) the hydrides are less susceptible to reorientation from the circumferential-axial plane into the radial-axial plane.

REFERENCES:
patent: 3567522 (1971-03-01), Thomas et al.
patent: 4000013 (1976-12-01), MacEwen et al.
patent: 4065328 (1977-12-01), Cheadle
patent: 4212686 (1980-07-01), Lunde et al.
Williams et al., "Development of High Strength Zirconium Alloys", Canadian Metallurgical Quarterly, vol. 11, No. 1, 1972 (pp. 257-271).
Ibrahim et al., "Creep and Stress-Rupture of High Strength Zirconium Alloys", Canadian Metallurgical Quarterly, vol. 11, No. 1, (1972), pp. 273-283.
Cheadle et al., "Development of texture and structure in Zr-2.5 wt. %, Nb extruded tubes", Canadian Metallurgical Quarterly, vol. 11, No. 1, 1972, pp. 121-127.
Ells et al., "The Irradiation Response of a Group of Complex Zirconium Alloys", Proceedings British Nuclear Energy Society, London, Nov. 9-10, 1972, pp. 43-46.
Kangilaski, "Metallurgy of Common Cladding Materials", Reactor Materials, vol. 13, No. 1, Spring 1970, pp. 1-7.

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