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The creep life prediction of alloys has been an important issue in the design, operation and maintenance of nuclear and thermal power plants where P92 steel was widely used in the components operating at elevated temperatures. In this work, conventional creep experiments at different applied stresses were performed at 650℃. Results indicate that both the applied stress and creep cavities significantly influence the creep behaviour of P92 steel. Necking phenomena diminish with decreasing applied stress, while the number of cavities at the fracture edge decreases with increasing stress. Based on the relation between microstructural evolution and variation in elasticity modulus (E), hardness (H) and strain rate sensitivity (m) measured by nanoindentation, a creep damage indicator ln(H/E)/m is proposed. The indicated is further used in an existing model to predict the creep life of P92 steel and the predictions are in good agreement with the experimental results.
Yu et al. (Sun,) studied this question.