Microstructural damage assessment in alloy 617M near high cycle fatigue threshold at elevated temperature-Reference-Cited by-同舟云学术

Microstructural damage assessment in alloy 617M near high cycle fatigue threshold at elevated temperature

Published:2024-02-06 Issue:4 Volume:47 Page:1445-1465
ISSN:8756-758X
Container-title:Fatigue & Fracture of Engineering Materials & Structures
language:en
Short-container-title:Fatigue Fract Eng Mat Struct

Author:

Kale Sandeep¹^ORCID,Thawre M. M.¹,Peshwe D. R.¹,Nagesha A.²³,Sarkar Aritra⁴,Dandekar Tushar R.⁵

Affiliation:

1. Department of Metallurgical and Materials Engineering Visvesvaraya National Institute of Technology (VNIT) Nagpur India

2. Mechanical Metallurgy Division Indira Gandhi Centre for Atomic Research (IGCAR) Kalpakkam India

3. Homi Bhabha National Institute (HBNI) Mumbai India

4. Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology (NTNU) Trondheim Norway

5. School of Mechanical and Design Engineering University of Portsmouth Portsmouth UK

Abstract

AbstractHigh cycle fatigue (HCF) behavior of Ni superalloy 617M is investigated at 973 K and R‐ratio −1 on a resonance‐based fatigue testing system at 85 Hz frequency. The alloy experiences an abrupt drop in fatigue life within a narrow domain of 2.5–5 MPa near its fatigue strength at 320 MPa. Electron microscopy and diffraction techniques were employed to thoroughly analyze the nominal fatigue damage. The characterization revealed the significance of precipitation of secondary phases M23C6, Ti (C, N), and γ′ phase in dictating the HCF strength of the alloy. Cyclic loading at high temperature causes γ‐matrix hardening and secondary phase precipitation synergistically strengthening the material beyond its yield strength. Conjunctively, dynamic strain aging was also seen to play a major role in the evolution of fatigue damage. The work highlights the collective contribution of γ′‐phase precipitation, carbides, and dynamic strain aging and their influence on the HCF behavior of alloy 617M.

Publisher

Wiley

Link

https://onlinelibrary.wiley.com/doi/pdf/10.1111/ffe.14253

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