Abstract
In June 1988, the Discovery Space Shuttle mission was delayed because of a malfunctioning hydrogen fuel bleed valve system. The problem was traced to the linear variable differential transformer (LVDT) which produced erroneous readings for the valve position. Near liquid hydrogen temperatures, Inconel 718 used in the armature of the LVDT became strongly magnetic. The AC magnetic susceptibility of three samples of Inconel 718 of slightly different compositions, one sample of Inconel 625, and one sample of Inconel 600 were measured as a function of temperature. Inconel 718 behaves as a spin glass. Its susceptibility reaches a maximum between 15 and 19 K, near the liquid hydrogen boiling point, 20 K. The susceptibility increases by an order of magnitude as the iron content increases by 1.2% and the nickel content decreases by 1.5%. The nominal composition is 12–20% iron and 50–55% nickel. Inconel 625, which contains about 4% iron, was paramagnetic. Inconel 600 exhibited spin glass properties below 6 K, short-range ferromagnetism between 6 and 92 K, and paramagnetism above 92 K.
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© 1990 Plenum Press, New York
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Goldberg, I.B., Mitchell, M.R., Murphy, A.R., Goldfarb, R.B., Loughran, R.J. (1990). Magnetic Susceptibility of Inconel Alloys 718, 625, and 600 at Cryogenic Temperatures. In: Reed, R.P., Fickett, F.R. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 36. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9880-6_98
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DOI: https://doi.org/10.1007/978-1-4613-9880-6_98
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