Abstract
Refractory metal alloys have been proposed for fusion reactor and space power applications because of their high-temperature strength, low thermal stress properties, good compatibility with liquid-metal coolants and radiation resistance. Little is known, however, about the cyclic fatigue properties that are important to some fusion reactor systems that operate in thermal cycles. This paper presents limited results of in-vacuum cyclic fatigue tests on Vanstar-7 (9 Cr-3 Fe-Zr) at room temperatures, 550, and 650/sup 0/C. Miniature hourglass-shaped specimens were used with a gauge diameter of 3.18 mm. The material was annealed 1 h in vacuum at 1400/sup 0/C before machining, to produce an average grain size of ASTM No.7. The specimens were stress relieved for 0.5 h at 1400/sup 0/C after machining.
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