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Title: 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
Authors:
Publication Date:
OSTI Identifier:
1169089
DOE Contract Number:
FE0024027
Resource Type:
Other
Research Org:
General Electric Company
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
Materials/Components/Instrumentation