Tensile properties of haynes alloy 230 and inconel 617 after long exposures to LiF-22CaF2 and vacuum at 1093 K
As a part of a study of a space-based thermal energy storage system utilizing the latent heat of fusion of the eutectic salt LiF-20CaF2 (mole%), the two wrought Ni-base superalloys Haynes alloy 230 and Inconel 617 were subjected to molten salt, its vapor, and vacuum for periods as long as 10,000 h at 1093 K. Following exposure, the microstructures were characterized, and samples from each superalloy were tensile tested between 77 and 1200 K. Neither the structure nor mechanical properties revealed evidence for additional degradation due to exposures to the salt. Although some loss in tensile properties was noted, particularly at 77 K, this reduction could be ascribed to the influence of simple aging at 1093 K.
KeywordsInconel 617 Haynes alloy 230 heat treatment long term exposure superalloy tensile properties thermal energy storage
Unable to display preview. Download preview PDF.
- 1.T.L. Labus, R.R. Secunde, and R.G. Lovely, Solar Dynamic Power Module Design, paper No. 899277 in IECEC ’89, Vol 1, Institute for Electrical and Electronic Engineers, New York, 1989, p 299–307Google Scholar
- 2.H.J. Strumpf and M.G. Coombs, Solar Receiver for the Space Station Brayton Engine, ASME paper 87-GT-252, Proceedings of the Gas Turbine Conference and Exhibition, Anaheim, CA, May 31–June 4, 1987, ASME, 1987Google Scholar
- 3.R.C. Schulze, The Corrosion of Superalloys by Lithium Fluoride in a Cyclic High Temperature Corrosion Environment, NASA CR-54781, 1965Google Scholar
- 4.J.N. Mattavi, F.E. Heffner, and A.A. Miklos, The Sterling Engine for Underwater Vehicle Applications, SAE paper 690731, SAE, Warrendale, PA, 1969, p 2376–2400Google Scholar
- 5.E.R. Cprek, Metallurgical studies of high temperature alloy capsules after long time cyclic corrosion tests as containers for lithium fluoride, General Motors Research Laboratories report GMR-2690, part 7.109, 1978Google Scholar
- 7.J.D. Cotton and L.M. Sedgwick, Compatibility of Selected Superalloys with Molten LiF-CaF2 Salt, paper No. 899235 in IECEC ’89, Vol 2, Institute for Electrical and Electronic Engineers, New York, 1989, p 917–921Google Scholar
- 8.H.J. Strumpf, R.P. Rubley, and M.G. Coombs, Material Compatibility and Simulation Testing for the Brayton Engine Solar Receiver for the NASA Space Station Freedom Solar Dynamic Option, paper No. 899076 in IECEC ’89, Vol 2, Institute for Electrical and Electronic Engineers, New York, 1989, p 895–903Google Scholar
- 9.H.J. Strumpf, R.P. Rubley, and M.G. Coombs, Solar Receiver Thermal Energy Storage Canister Compatibility Test, AiResearch Division, Allied-Signal Aerospace Company report No. 90-64179, 1990Google Scholar
- 15.Haynes International Data Sheets for Haynes Alloy 188 and Haynes Alloy 230Google Scholar