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Effects of temperature and microstructure on low cycle fatigue behaviour of a PM Ni-based superalloy: EBSD assessment and crystal plasticity simulation

journal contribution
posted on 21.02.2022, 12:08 authored by WT Zhang, R Jiang, Y Zhao, LC Zhang, L Zhang, Liguo ZhaoLiguo Zhao, YD Song
The macro and mesoscale deformation and damage of the PM nickel-based superalloy FGH4098 under low cycle fatigue loading at elevated temperatures were investigated using both SEM/EBSD characterization and crystal plasticity finite element (CPFE) simulations. The results indicate that higher temperature leads to more severe macroscale damage i.e. larger areas of hysteresis loops and shorter fatigue life with transgranular failure mode at both 650℃ and 750℃. The misorientation parameters derived from EBSD characterization show similar deformation at both temperatures, but more intense localized deformation in the crack initiation region at 750℃. Based on the accumulated shear-strain energy dissipation density and Fatemi-Socie fatigue indicator parameter, the distribution and evolution of fatigue damage are shown to be strongly affected by local stress-strain state and temperatures, and more severe and homogeneous damage is found at 750℃. The CPFE simulation results also show higher damage propensity, as indicated by the fatigue indicator parameters used here, in the vicinity of annealing twin boundaries with high difference in elastic modulus.

Funding

National Science and Technology Major Project (2017-VI-0008-0078; 2017-IV-0004-0041)

National Natural Science Foundation of China (No. 51805251; 11872204)

Natural Science Foundation of Jiangsu Province (No. BK20180434)

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

International Journal of Fatigue

Volume

159

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal International Journal of Fatigue and the definitive published version is available at https://doi.org/10.1016/j.ijfatigue.2022.106818.

Acceptance date

18/02/2022

Publication date

2022-02-22

Copyright date

2022

ISSN

0142-1123

Language

en

Depositor

Prof Liguo Zhao. Deposit date: 21 February 2022

Article number

106818