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Vol. 45 (2004) No. 2 P 396-398



The effect of hold time (th) on the thermal-mechanical fatigue property (TMF) of two nickel-base single crystal superalloys TMS-82+ and TMS-75, which are second- and third-generation single crystals, respectively, was investigated. Cycles to failure for both alloys decreased drastically with the increase in the hold time. The TMS-75 showed a longer life than the TMS-82+ at th=0. The TMS-82+ showed a longer life than the TMS-75 at th≠0, which could be attributed to the higher tensile strength at 400 °C and higher stress relaxation resistance at 900 °C in the TMS-82+. From microstructural studies, a slightly rafted γ/γ′ structure was observed in the TMS-82+ for TMF with a hold time. This work indicates that the TMS-82+ is appropriate to be served in gas turbine engines under specific conditions such as electric power generation.

Copyright © 2004 The Japan Institute of Metals and Materials

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