第2世代Ni基単結晶超合金TMS-82+の長時間クリープ特性

抄録

  Long component-life of at least two years under a daily start and stop condition is required on turbine blades and vanes in land-based power plants. For this reason, a creep rupture life of 10000 hours or longer is required for the application of Ni-base superalloys. In this paper, long-term creep property of more than 15000 hours was analyzed for a second-generation Ni-base superalloy, TMS-82+. Consequently, Larson-Miller parameters in the range of C=12-14 resulted in good fits over the short-to-long-term creep rupture life, even though C=20 is conventionally used for Ni-base superalloys. In addition, the creep strength of TMS-82+ exceeds that of CMSX-4 under wide range of stress/temperature conditions, especially under the higher temperature and lower stress condition.