Tokyo Institute of Technology · Engineering
Professor Motoki Sakaguchi's research lab specializes in the mechanical behavior and fatigue life assessment of advanced high-temperature structural materials, particularly single-crystal Ni-based superalloys used in gas turbines. The lab focuses on fatigue crack propagation, thermo-mechanical fatigue, and microstructure–property relationships under extreme service conditions, with an emphasis on near-threshold crack growth and damage mechanisms. Experimental and computational approaches, including crystal plasticity finite element analysis and miniature specimen testing, are employed to understand and predict component reliability in aero-engine and land-based turbine applications. The lab also explores innovative joining technologies for dissimilar materials, such as dimple spot welding, for lightweight and high-performance structural applications.
Figures are computed from collected data and may differ slightly.
Abstract Effects of rafted microstructure and its temperature dependency on fatigue crack propagation (FCP) in a single‐crystal Ni‐base superalloy are experimentally investigated. FCP tests are conducted at room temperature, 450°C, and 700°C for two types of pre‐rafted specimens, and their FCP behaviors are compared with that of a specimen with cuboidal γ′ precipitates. It is found in the experiments that there is no significant influence of rafted microstructures on FCP rate at room temperature
Behavior of thermo-mechanical fatigue (TMF) of a single crystal Ni-base superalloy, CMSX-4, was studied, compared with that of isothermal low-cycle fatigue (LCF). Strain-controlled TMF and LCF tests of CMSX-4 were carried out under various test conditions, where the experimental variables were strain rates, strain ratio, temperature range, and strain/temperature phase angle. At first it was shown experimentally that the TMF and LCF failures took places, associated with some noteworthy characteri
This chapter contains sections titled: Introduction Experimental Procedures Results and Discussion Summary Acknowledgements
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