Evolution of fatigue crack growth and fracture behavior in gamma titanium aluminide Ti-43.5Al-4Nb-1Mo-0.1B (TNM) forgings

Dahar, Matthew S.; Tamirisakandala, Sesh; Lewandowski, John J.

doi:10.1016/j.ijfatigue.2018.01.026

Cited by 21 publications

(6 citation statements)

References 17 publications

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“…From the above discussion, it appears that the key to obtaining improved mechanical properties (fatigue as well as other properties) in TiAl alloys is to use a processing route that will ensure grain refinement and texture-free microstructures. As stated at the beginning of this subsection, different processing routes can be employed to engineer microstructure [120]. Several research groups investigated how to improve the mechanical properties of β-solidifying γ-TiAl-based alloys by developing different processes and influencing their microstructural evolution.…”

Section: Microstructural Optimisation For Improved Lcf Life Of γ-Tial...mentioning

confidence: 99%

Low-Cycle Fatigue Behaviour of Titanium-Aluminium-Based Intermetallic Alloys: A Short Review

Ellard,

Mathabathe,

Siyasiya

et al. 2023

Metals

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Over the past decade, relentless efforts have brought lightweight high-temperature γ-TiAl-based intermetallic alloys into real commercialisation. The materials have found their place in General Electric’s (GE) high bypass turbofan aircraft engines for the Boeing 787 as well as in the PW1100GTF engines for low-pressure turbine (LPT) blades. In service, the alloys are required to withstand hostile environments dominated by cyclic stresses or strains. Therefore, to enhance the fatigue resistance of the alloys, a clear understanding of the alloys’ response to fatigue loading is pivotal. In the present review, a detailed discussion about the low-cycle fatigue (LCF) behaviour of γ-TiAl-based alloys in terms of crack initiation, propagation and fracture mechanisms, and the influence of temperature and environment on cyclic deformation mechanisms and the resulting fatigue life has been presented. Furthermore, a comprehensive discussion about modelling and prediction of the fatigue property of these alloys with regard to the initiation and propagation lives as well as the total fatigue life has been provided. Moreover, effective methods of optimising the microstructures of γ-TiAl-based alloys to ensure improved LCF behaviour have been elucidated.

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Section: Microstructural Optimisation For Improved Lcf Life Of γ-Tial...mentioning

confidence: 99%

Low-Cycle Fatigue Behaviour of Titanium-Aluminium-Based Intermetallic Alloys: A Short Review

Ellard,

Mathabathe,

Siyasiya

et al. 2023

Metals

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“…The Case Western Reserve University and Arconic team generated fatigue and facture data on as-cast, cast + HIP, and forged γ-TiAl material in different orientations, as shown in Figure 5. Key parameters such as the fatigue thresholds, overload toughnesses, Paris regime exponents, and plastic zone sizes were databased to develop a micro-mechanistic understanding [7]. A data-driven model was then developed by linking microstructure features/scale to crack tip plastic zone size and crack growth rate.…”

Section: Micro-mechanistic Fatigue and Fracture Modelmentioning

confidence: 99%

Integrated Computational Materials Engineering of Gamma Titanium Aluminides for Aerospace Applications

2020

Self Cite

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Although the benefits of titanium aluminides for intermediate service temperature applications were well conceived and significant research and development activities were conducted in the past four decades, they remained as developmental materials due to barriers associated with melting, processing, scale-up, and cost. Demanding requirements of efficient aero-engines and extensive risk reduction demonstrations paved the path for commercial introduction of gamma titanium aluminides. The single most attractive current application is for low pressure turbine blades (LPTBs) in advanced aero-engines replacing conventionally cast nickel superalloys. This paper provides an overview of recent progress, producibility challenges, and opportunities. The successful journey of gamma (γ) TiAl LPTB development from laboratory demonstrations to production insertions in mass-produced commercial jet engines will be described. Collaboration and integrated product development were identified as the most critical needs for rapid maturation and implementation of γ-TiAl into aerospace applications. An integrated computational materials engineering modeling framework and toolsets developed under a collaborative US Air Force Metals Affordability Initiative project between industry, government, and academia will be illustrated. Model-based optimization of material and processing for achieving desired performance goals will be highlighted.

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“…Case Western Reserve University recently studied the effects of thermomechanical processing, sample orientation, and load ratio on room-temperature fatigue crack growth and fracture behavior of a third-generation gamma titanium aluminide Ti-43.5Al-4Nb-1Mo-0.1B (TNM), currently used for low-pressure turbine airfoils. The CWRU work documented significant differences in microstructure, fracture behavior and fatigue properties for as-cast, cast+HIP, and forged conditions [15].…”

Section: New Alloy Developmentmentioning

confidence: 99%

Recent Advances in Titanium Technology in the United States

Venkatesh

2020

MATEC Web Conf.

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Substantial progress has continued in the US since the last (13th) World Titanium Conference with regards to titanium technology, products, processing, computational modeling tools and applications. Titanium components produced by additive manufacturing have been qualified and achieved production applications in commercial and military aircraft hardware. New high-performance titanium alloys have been developed for higher temperature service and applications requiring more demanding static and dynamic properties. Current production processes for titanium have been optimized, and new processes have been developed to further reduce cost and improve product quality. Titanium suppliers, OEM’s, government labs and academia are working closely together to address fundamental industry-wide issues. Computer modeling is now used extensively in industrial and research facilities to accelerate the pace and success of these developments.

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Evolution of fatigue crack growth and fracture behavior in gamma titanium aluminide Ti-43.5Al-4Nb-1Mo-0.1B (TNM) forgings

Cited by 21 publications

References 17 publications

Low-Cycle Fatigue Behaviour of Titanium-Aluminium-Based Intermetallic Alloys: A Short Review

Low-Cycle Fatigue Behaviour of Titanium-Aluminium-Based Intermetallic Alloys: A Short Review

Integrated Computational Materials Engineering of Gamma Titanium Aluminides for Aerospace Applications

Recent Advances in Titanium Technology in the United States

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