Modeling Long-term Creep Performance for Welded Nickel-base Superalloy Structures for Power Generation Systems
We report here a constitutive model for predicting long-term creep strain evolution in’ strengthened Ni-base superalloys. Dislocation climb-bypassing’, typical in intermediate’ volume fraction (~20%) alloys, is considered as the primary deformation mechanism. Dislocation shearing’ to anti-phase boundary (APB) faults and diffusional creep are also considered for high-stress and high-temperature low-stress conditions, respectively. Additional damage mechanism is taken into account for rapid increase in tertiary creep strain. The model has been applied to Alloy 282, and calibrated in a temperature range of 1375-1450°F, and stress range of 15-45ksi. The model parameters and a MATLAB code are provided. This report is prepared by Monica Soare and Chen Shen at GE Global Research. Technical discussions with Dr. Vito Cedro are greatly appreciated. This work was supported by DOE program DE-FE0005859
- Research Organization:
- General Electric Co., Boston, MA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FE0024027
- OSTI ID:
- 1169089
- Country of Publication:
- United States
- Language:
- English
Similar Records
Molecular Dynamics Study of Creep Deformation in Nickel-based Superalloy
Modelling of recovery controlled creep in nickel-base superalloy single crystals