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Development of predictive model for accurate rupture time from multi-axial creep in alloy 709 with physics-based simulations.

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Title: Development of predictive model for accurate rupture time from multi-axial creep in alloy 709 with physics-based simulations.
Authors: Baweja, Shahmeer1 (AUTHOR) s.baweja@outlook.com, Messner, Mark C.1 (AUTHOR)
Source: Computational Materials Science. Feb2026, Vol. 263, pN.PAG-N.PAG. 1p.
Subjects: Austenitic stainless steel, Creep (Materials), Prediction models, Computer simulation, Heat resistant materials, Strains & stresses (Mechanics)
Abstract: A physics-based model is developed to predict multiaxial creep behavior in Alloy 709 (A709), an advanced austenitic stainless steel intended for high-temperature applications such as Sodium Fast Reactors (SFRs). Compared to conventional stainless steels like 316H, A709 offers superior high-temperature performance; however, comprehensive data on its multiaxial creep response remain limited. To address this gap, a crystal plasticity finite element (CPFE) framework is used to simulate the deformation and failure mechanisms of A709 under multiaxial loading conditions. The model incorporates an extended Hu-Cocks dislocation creep formulation that accounts for precipitation effects, along with the Sham–Needleman model to capture grain boundary cavitation-driven failure. These advanced constitutive models enable a detailed understanding of the interplay between microstructural evolution and macroscopic creep response. Furthermore, the study evaluates the predictive accuracy of various effective stress measures in estimating creep rupture life, leveraging simulated multiaxial creep data. The findings provide critical insights into the applicability of different stress measures for engineering design and life prediction of A709 components operating under complex loading conditions. This work contributes to improving the reliability of high-temperature structural components by advancing predictive modeling capabilities for advanced austenitic steels. [Display omitted] • Physics-based crystal plasticity simulations are used to study Alloy 709 creep. • Multiaxial stress state strongly influences creep rupture lifetime in Alloy 709. • A new effective stress model improves rupture life prediction under complex loads. • The model captures both grain-scale deformation and grain-boundary damage. • The approach reduces the need for difficult multiaxial creep testing. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:A physics-based model is developed to predict multiaxial creep behavior in Alloy 709 (A709), an advanced austenitic stainless steel intended for high-temperature applications such as Sodium Fast Reactors (SFRs). Compared to conventional stainless steels like 316H, A709 offers superior high-temperature performance; however, comprehensive data on its multiaxial creep response remain limited. To address this gap, a crystal plasticity finite element (CPFE) framework is used to simulate the deformation and failure mechanisms of A709 under multiaxial loading conditions. The model incorporates an extended Hu-Cocks dislocation creep formulation that accounts for precipitation effects, along with the Sham–Needleman model to capture grain boundary cavitation-driven failure. These advanced constitutive models enable a detailed understanding of the interplay between microstructural evolution and macroscopic creep response. Furthermore, the study evaluates the predictive accuracy of various effective stress measures in estimating creep rupture life, leveraging simulated multiaxial creep data. The findings provide critical insights into the applicability of different stress measures for engineering design and life prediction of A709 components operating under complex loading conditions. This work contributes to improving the reliability of high-temperature structural components by advancing predictive modeling capabilities for advanced austenitic steels. [Display omitted] • Physics-based crystal plasticity simulations are used to study Alloy 709 creep. • Multiaxial stress state strongly influences creep rupture lifetime in Alloy 709. • A new effective stress model improves rupture life prediction under complex loads. • The model captures both grain-scale deformation and grain-boundary damage. • The approach reduces the need for difficult multiaxial creep testing. [ABSTRACT FROM AUTHOR]
ISSN:09270256
DOI:10.1016/j.commatsci.2025.114427