Current ASME Section III, Division 5 code provides elastic and simplified inelastic analysis options for designing nuclear components for elevated temperature service. These analyses methods may fail to capture the complex creep-fatigue response and damage accumulation in materials at elevated temperatures. Hence, for analysis and design of nuclear components at elevated temperature, full inelastic analysis that can simulate creep-fatigue responses may be needed. Existing ASME code neither provide guidelines for using full inelastic analysis nor recommend the type of constitutive model to be use. Hence, an unified rate dependent constitutive model incorporating a damage parameter will be developed and its parameters for base metal (BM) and diffusion bonded (DB) alloy 800H will be determined. In addition, a full inelastic analysis methodology using this model to analyze creep-fatigue performance of component for nuclear applications will be developed. BM 800H data are collected from literature and DB 800H data are generated through conducting a set of creep, fatigue and creep-fatigue tests to determine constitutive material model parameters. The parameter determination methodology for constitutive model is discussed. The optimized parameter set for BM and DB alloy 800H at different temperatures will be presented in the paper. Recommendations are provided on the constitutive model development and its parameter determination techniques.


An Unified Constitutive Model With Optimized Parameters for Base and Diffusion Bonded Alloy 800h

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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