Abstract
We have studied the effects of zirconium additions on the mechanical properties of alloys having the base composition Ni-12 wt% Mo-7 wt% Cr-0.2 wt% Mn-0.05 wt% C. Zirconium levels studied ranged from 0 to 1.18 wt% and included small laboratory melts and three 45-kg (100-lb) commercial melts. Generally, zirconium improved the strength and the fracture strain in both the irradiated and unirradiated conditions. The most dramatic effects were noted in the postirradiation creep tests, where as little as 0.05 wt% zirconium improved the rupture life and the fracture strain. This improvement is attributed to the formation of very fine MC-type carbides in the alloys containing zirconium. Zirconium addition of only 0.05 wt% led to weld metal cracking.
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