Assessment of Titanium Aluminide Alloys for High-Temperature Nuclear Structural Applications

Zhu, Hanliang; Wei, Tao; Carr, David G.; Harrison, Robert; Edwards, L.; Hoffelner, Wolfgang; Seo, Dongyi; Maruyama, Kouichi

doi:10.1007/s11837-012-0471-5

Cited by 23 publications

(6 citation statements)

References 55 publications

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“…This results in a steep slope of the Paris region for FCG when compared to conventional superalloys and steels. In turbines, high-cycle fatigue (HCF), where the number of cycles to failure, N f , is greater than 10 4 , is due to aerodynamically induced vibrations at a component's inherent resonant frequencies, as a result of changes in rotational speeds. This HCF therefore exists in addition to the steady state or low-cycle fatigue (LCF -N f < 10 4 ) loading that occurs upon engine start up and shut down.…”

Section: Introductionmentioning

confidence: 99%

“…Gamma titanium aluminide ( γ -TiAl) alloys are emerging as a viable lightweight replacement to nickel superalloys, for use in both the turbine and compressor stages of aero-engines [1,2], as well as in high performance automobiles [3] and the nuclear industry [4]. By mid-2017, the γ -TiAl alloy Ti–48Al–2Cr–2Nb (at.-%) has seen 6 years of commercial flight aboard the GEnx engines (General Electric, U.S.A.) [1].…”

Section: Introductionmentioning

confidence: 99%

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Recent progress in the high-cycle fatigue behaviour of γ-TiAl alloys

Edwards

2018

Materials Science and Technology

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The high-cycle fatigue (HCF) properties of γ -TiAl (gamma titanium aluminide) alloys are reviewed, particularly with regards to the deformation mechanisms active in the near-threshold cyclic loading regime. By examining the influence of lamellar orientation and thickness on the HCF threshold, in addition to more conventional microstructural considerations such as the grain size or the volume fraction of lamellar colonies, factors to improve the γ -TiAl microstructure for HCF are assessed. Finally, experimental methods and loading strategies are surveyed to identify techniques for improving HCF testing of γ -TiAl alloys. In this, we consider both the conservativism of differing approaches and the possibility to measure with suitable resolution the local mechanical behaviour under HCF of the lamellar γ -TiAl microstructure. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent progress in the high-cycle fatigue behaviour of γ-TiAl alloys

Edwards

2018

Materials Science and Technology

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“…In the speciality literature [16][17][18] most frequent approaches refer to specific behaviors occurring in the material or class of material for a set of given stresses, the paper proposes a rapid and easy methodology for the appropriate selection both of real stresses and the needs of a beneficiary. Of course, further analysis of its behavior in operation cannot be excluded.…”

Section: Discussionmentioning

confidence: 99%

Assessment of metallic materials required for shock stress protection

et al. 2017

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Abstract. Establishing which metallic materials are suitable to be used for the protection of operators and machinery, when subjected to stress impact in the drilling industry, for surface exploitation, mines and quarries, is a complex process. Due to the harsh operating conditions, a careful evaluation of the various materials used is of utmost importance. This paper addresses the issues relating to the methodology of determining the appropriate homogenous materials to be used, based on a correspondence between their characteristics and applications. Starting with a list of specific operating conditions, one has established a set of requirements and has assessed the market; the recommended materials for the job are alloy steels and aluminum alloys.

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“…1 shows the microstructural components and microstructural features within a lamellar colony of a TiAl alloy. The microstructural features that may influence the materials properties of lamellar TiAl alloy include: volume fraction of a lamellar colony (V f ); colony or grain size (d); lamellar spacing (k); volume fraction of a 2 lamellae (f a2 ); grain boundary morphology; size, density and volume fraction of precipitates; lamellar orientation with respect to stress axis; polycrystalline grain or columnar grain structures caused by directional solidification [4].…”

Section: Microstructural Strengthening For Thermal Creep Deformation mentioning

confidence: 99%

“…The microstructure of metallic materials can also strongly influence other materials properties such as corrosion resistance, oxidation resistance, ductility, fracture toughness. The careful manipulation of microstructures in metallic materials allows for the development of purpose-designed properties for the various extreme environments such as in advanced nuclear systems [4].…”

Section: Introductionmentioning

confidence: 99%