高強度Ni基単結晶超合金TMS-82+の開発

概要

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A new Ni-base single crystal superalloy, TMS-82+, has been developed. The creep rupture strength of this alloy is higher than those of the second and even the third generation single crystal superalloys especially in high temperature and low stress condition. Advantage of stress rupture temperature is over 30℃ in comparison with the second generation single crystal superalloys at the 137MPa/10^5 hours condition. This advantage due to TMS-82+ has a large negative lattice misfit. The large negative lattice misfit enhances the formation of continuous γ' platelets, the so-called raft structure, and a fme interfacial dislocation network on tensile creep condition. These are considered to prevent the movement of dislocations and decrease the creep strain rate. Other properties such as oxidation resistance, phase stability and processability of TMS-82+ are same as those of second generation SC superalloys. For a final evaluation of this alloy, rotating test has been conducted with 15MW Toshiba test gas turbine plant since December 2000.
2001-09-20