Employing sequential experiments to gain insights on the interaction between creep and fatigue damage in Ni‐base superalloys

Gorgannejad, Sanam; Estrada Rodas, Ernesto A.; Neu, Richard W.

doi:10.1111/ffe.13715

Employing sequential experiments to gain insights on the interaction between creep and fatigue damage in Ni‐base superalloys

Journal Article · Wed Apr 20 00:00:00 EDT 2022 · Fatigue and Fracture of Engineering Materials and Structures

DOI:https://doi.org/10.1111/ffe.13715· OSTI ID:1996451

Gorgannejad, Sanam ^[1]; Estrada Rodas, Ernesto A. ^[2]; Neu, Richard W. ^[3]

George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia USA, Lawrence Livermore National Laboratory Livermore California USA
George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia USA
George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia USA, School of Materials Science and Engineering Georgia Institute of Technology Atlanta Georgia USA

Abstract

The interaction between creep and fatigue damage in Ni‐base superalloy CMSX‐8 was explored using a sequential workflow that decouples creep and fatigue steps to quantify how accumulated creep damage interacts with subsequent isothermal low‐cycle fatigue (LCF) and vice versa. Two workflows were considered: creep followed by LCF and LCF followed by creep. For the first workflow, the subsequent LCF was evaluated at temperatures of 20°C, 750°C, and 1100°C. It was found that the extent of deleterious interaction of prior creep on LCF depended on increasing subsequent fatigue test temperature. For the LCF followed by creep, fatigue tests were first conducted at 20°C and 1100°C to 60% of life, and then creep was conducted at 800°C, where primary creep is promoted, or 900°C, where primary creep is absent. LCF damage accumulated at 1100°C accelerated creep and decreased ductility, while fatigue damage at room temperature had minimal effect on the creep behavior.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0011722

OSTI ID:: 1996451

Journal Information:: Fatigue and Fracture of Engineering Materials and Structures, Journal Name: Fatigue and Fracture of Engineering Materials and Structures Journal Issue: 7 Vol. 45; ISSN 8756-758X

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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