On the microstructural evolution in 12% Cr turbine steel during low cycle fatigue at elevated temperature

Rae, Y.; Guo, X.; Benaarbia, A.; Neate, N.; Sun, W.

Abstract

© 2019 Elsevier B.V. In order to better understand the physical process of deformation and cyclic softening a 12% Cr martensitic stainless steel FV566 has been cyclically tested at high temperature in strain control. Increase in temperature was found to increase the cyclic life, softening rate and viscous stress magnitude. An increase in the dwell time led to the acceleration of the material degradation. The microstructure changes and dominating deformation mechanisms were investigated by means of scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy. The results have revealed a gradual sub-grain coarsening, transformation of lath structure into fine equiaxed subgrains, and misorientation angle development in blocks and packets until material failure. The softening behaviour was attributed to the mutual annihilation of the dislocations and rearrangement of the residual dislocation in the low energy structures.

Citation

Rae, Y., Guo, X., Benaarbia, A., Neate, N., & Sun, W. (2020). On the microstructural evolution in 12% Cr turbine steel during low cycle fatigue at elevated temperature. Materials Science and Engineering: A, 773, https://doi.org/10.1016/j.msea.2019.138864

• Journal Article Type: Article
• Acceptance Date: Dec 20, 2019
• Online Publication Date: Dec 23, 2019
• Publication Date: Jan 31, 2020
• Deposit Date: Dec 29, 2019
• Publicly Available Date: Dec 24, 2020
• Journal: Materials Science and Engineering A
• Print ISSN: 0921-5093
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 773
• Article Number: 138864
• DOI: https://doi.org/10.1016/j.msea.2019.138864
• Keywords: Mechanical Engineering; General Materials Science; Mechanics of Materials; Condensed Matter Physics
• Public URL: https://nottingham-repository.worktribe.com/output/3645008
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0921509319316442
• Additional Information: This article is maintained by: Elsevier; Article Title: On the microstructural evolution in 12% Cr turbine steel during low cycle fatigue at elevated temperature; Journal Title: Materials Science and Engineering: A; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.msea.2019.138864; Content Type: article; Copyright: © 2019 Elsevier B.V. All rights reserved.