Alloy: Creep–Fatigue Interaction, Damage Mechanisms and Environmental Effects

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Failure Analysis".

Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 1682

Special Issue Editor


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Guest Editor
Oak Ridge National Laboratory, Material Science and Technology Division, Oak Ridge, TN 37831, USA
Interests: creep–fatigue evaluation; creep–fatigue interaction; creep–fatigue damage mechanism; creep–fatigue life; creep–fatigue design

Special Issue Information

Dear Colleagues,

Meeting the growing demands for global energy efficiency, sustainability, and reduced environmental impact presents new challenges for energy systems. A comprehensive understanding of the deformation and damage mechanisms of structures and materials operating at high temperatures plays a critical role in driving the advancement of the technologies. This understanding enables the engineers and designers to identify vulnerabilities and implement effective mitigation strategies to ensure the structural integrity of critical components in energy systems.

For components in the energy systems that are exposed to combined cyclic loading and high temperatures over an extended period, one dominant damaging mechanism is creep–fatigue interaction. Creep–fatigue interaction significantly reduces the lifespan of components in high-temperature environments, such as gas turbines, nuclear reactors, and steam pipes.

Evaluating creep–fatigue damage involves assessing a material's ability to withstand these combined environmental effects through experimental testing, analytical modeling, and computer simulations. The aim of creep–fatigue evaluation is to estimate the remaining useful life of components, identify potential failure mechanisms, and establish design guidelines for mitigating creep–fatigue damage and ensuring sufficient safe design margin.

This Special Issue of Metals is dedicated to the evaluation of creep–fatigue interaction damage in high-temperature structures and materials. We welcome your valuable contributions investigating the latest developments in creep–fatigue evaluation and on creep–fatigue interaction damage.

Dr. Yanli Wang
Guest Editor

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Keywords

  • creep–fatigue evaluation
  • creep–fatigue interaction
  • creep–fatigue damage mechanism
  • creep–fatigue life
  • creep–fatigue design

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Published Papers (1 paper)

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Research

14 pages, 28186 KiB  
Article
Low-Cycle Corrosion Fatigue Deformation Mechanism for an α+β Ti-6Al-4V-0.55Fe Alloy
by Yangyang Sun, Shenwei Qian, Hui Chang, Liang Feng, Feng Li and Lian Zhou
Metals 2024, 14(6), 720; https://doi.org/10.3390/met14060720 - 17 Jun 2024
Cited by 1 | Viewed by 1354
Abstract
Titanium alloys with high strength and good corrosion resistance have become one of the critical bearing structural materials in marine engineering. But in service, corrosion fatigue would occur under the synergetic action of cyclic external load and corrosion environment, threatening the safety of [...] Read more.
Titanium alloys with high strength and good corrosion resistance have become one of the critical bearing structural materials in marine engineering. But in service, corrosion fatigue would occur under the synergetic action of cyclic external load and corrosion environment, threatening the safety of components. In this study, compared with low-cycle fatigue in laboratory air, the low-cycle corrosion fatigue deformation mechanism and fracture characteristic of the Ti-6Al-4V-0.55Fe alloy were investigated in 3.5% NaCl corrosion solution under selected stress amplitudes. The results showed that under low stress amplitude, corrosion fatigue was determined by fatigue damage and corrosion damage, causing a reduction in fatigue life. The local stress concentration caused by corrosion pits and dislocations pile-up accelerated the initiation of fatigue cracks, and other corrosion behavior including crevice corrosion promoted fatigue crack propagation; the corrosion solution increased the surface damage. While under high stress amplitude, due to the short contact time between the sample and solution and higher applied stress, the fatigue life is determined by fatigue damage caused by multiple slips. Full article
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