TENSILE PROPERTIES OF HAYNES ALLOY-230 AND INCONEL-617 AFTER LONG EXPOSURES TO LIF-22CAF(2) AND VACUUM AT 1093 K

As a part of a study of a space-based thermal energy storage system ut ilizing the latent heat of fusion of the eutectic salt LiF-20CaF(2) (m ole %), the two wrought Ni-base superalloys Haynes alloy 230 and Incon el 617 were subjected to molten salt, its vapor, and vacuum for period s as long as 10,000 h at 1093 K, Following exposure, the microstructur es were characterized, and samples from each superalloy were tensile t ested between 77 and 1200 K. Neither the structure nor mechanical prop erties revealed evidence for additional degradation due to exposures t o the salt, Although some loss in tensile properties was noted, partic ularly at 77 K, this reduction could be ascribed to the influence of s imple aging at 1093 K.