CREEP-FATIGUE CRACK-GROWTH BEHAVIOR IN 1CR-1MO-0.25V STEEL .2. CRACK-GROWTH BEHAVIOR AND MODELS

Creep-fatigue crack growth (CFCG) behavior of an ex-service 1Cr-1Mo-0. 25V steel was investigated for hold times of 100 s, 15 min, and 8 h fo r a trapezoidal loading waveform at a temperature of 538 degrees C. Th e correlation of the crack growth rate with (C-t)(avg) for various hol d times was significantly improved when an appropriate estimation sche me, previously proposed by the authors, was used to estimate this cree p fracture mechanics parameter for this material. Crack growth data un der creep-fatigue conditions and analysis procedures used to reduce th em are described in detail in this paper.