Thesis_Lu Zhang.pdf (24.3 MB)
Cyclic deformation, fatigue crack initiation and crack growth in a nickel-based single-crystal superalloy
thesis
posted on 2021-08-01, 00:33 authored by Lu ZhangSingle-crystal nickel-based superalloys are dominantly used for turbine blades due to their superior mechanical properties, fatigue and creep resistance at elevated temperature. Typically, gas turbines operate at high alternating load during engine start-up and shut-down, which subjects nickel-based superalloys to severe cyclic loads in harsh environments. For gas turbine blades, a large proportion of service life is spent in the initiation and growth of short fatigue cracks. Therefore, it is important to understand the mechanism of cyclic deformation, crack initiation and the early stage of crack propagation for reliable service-life prediction and optimal design of gas turbine systems.
Cyclic deformation, fatigue crack initiation and short crack growth in nickel-based single-crystal superalloys have been studied experimentally and numerically in this thesis. Strain-controlled low-cycle fatigue (LCF) tests were carried out, with a focus on the effects of crystal orientation and temperature. [Continues.]
Funding
Dislocation-Microstructure Interaction at a Crack Tip - In Search of a Driving Force for Short Crack Growth
Engineering and Physical Sciences Research Council
Find out more...Oxidation Damage at a Crack Tip and Its Significance in Crack Growth under Fatigue-Oxidation Conditions
Engineering and Physical Sciences Research Council
Find out more...History
School
- Mechanical, Electrical and Manufacturing Engineering
Publisher
Loughborough UniversityRights holder
© Lu ZhangPublication date
2019Notes
A thesis submitted in partial fulfilment of the requirements for the award of the degree of Doctor of Philosophy of Loughborough University.Language
- en
Supervisor(s)
Liguo Zhao ; Vadim Silberschmidt ; Anish RoyQualification name
- PhD
Qualification level
- Doctoral
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