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Melting Fabrication and Creep Testing of a 1.39% Ti + 0.34% Zr + 0.30% C Molybdenum Alloy

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The three major methods of strengthening molybdenum alloys are solid-solution strengthening, dispersion hardening, and strain hardening. Much of the early work on the effects of alloying additions on the strength and recrystallization temperature of molybdenum alloys is attributable to Semchyshen et. al. at the Climax molybdenum Company. It was Chang at General Electric, however, who did the fundamental work and phase identification that led to an understanding of the importance of dispersion hardening in the higher strength alloys. Out of this large amount of work a Mo 1.25 Ti .032 Zr 0.30 C was reported to have highest rupture life at 2400 degrees F of any other alloy treated. The alloy was also reported to have a 1-hr recrystallization temperature of 3200 degrees F. The significance of a high recrystallization temperature is that one can take advantage of molybdenums high work hardening rate as a means of strengthening at higher temperatures. The usefulness of the dispersed carbide phase in this alloy is not only in its role in dispersion hardening but also in retarding recovery and raising the recrystallization temperature. This TZC 0.3 C alloy seemed to offer great potential. However, no creep data were available for the alloy nor was it commercially available from the alloy producers. It was therefore necessary for us to have the composition melted, fabricated and tested on an experimental basis at various specialized facilities throughout the country.

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  • Properties of Metals and Alloys

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