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Dahar Dissertationv57.pdf (69.84 MB)

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Effects of Microstructure and Processing on Fracture And Fatigue Crack Growth Of Ti-43.5Al-4Nb-1Mo (TNM) Third Generation Turbine Blade Material

Dahar, Matthew Scott
http://orcid.org/0000-0002-7773-2133
http://rave.ohiolink.edu/etdc/view?acc_num=case1512601932780114

Abstract Details

2018, Doctor of Philosophy, Case Western Reserve University, Materials Science and Engineering.
The effects of thermal and thermomechanical processing, sample orientation, and load ratio on the room temperature fatigue crack growth and fracture behavior of a third-generation gamma titanium aluminide Ti-43.5Al-4Nb-1Mo-0.1B (TNM) were determined in this study. Bend bar specimens, excised from TNM in as-cast, cast + hot isostatic pressing, and forge + heat treat conditions in the longitudinal and transverse directions, were tested at room temperature in lab air. Load ratios in the range 0.1 – 0.9 were used in fatigue testing to determine their effects on the fatigue threshold, Paris law slope, and stress intensity at overload. Microscopy, fractography, and X-ray diffraction were used to understand the effects of process and testing variables on the fatigue crack path and morphology. The effects of microstructure length scales and microconstituents are discussed in relation to the properties measured.
John Lewandowski (Advisor)
Sesh Tamirisakandala (Committee Chair)
Clare Rimnac (Committee Member)
Gerhard Welsch (Committee Member)
Jennifer Carter (Committee Member)
226 p.
Materials Science
TNM; Fatigure; TiAl; Fracture; Tensile; Crack Growth

Recommended Citations

Citations

  • Dahar, M. S. (2018). Effects of Microstructure and Processing on Fracture And Fatigue Crack Growth Of Ti-43.5Al-4Nb-1Mo (TNM) Third Generation Turbine Blade Material [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1512601932780114

    APA Style (7th edition)

  • Dahar, Matthew. Effects of Microstructure and Processing on Fracture And Fatigue Crack Growth Of Ti-43.5Al-4Nb-1Mo (TNM) Third Generation Turbine Blade Material. 2018. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1512601932780114.

    MLA Style (8th edition)

  • Dahar, Matthew. "Effects of Microstructure and Processing on Fracture And Fatigue Crack Growth Of Ti-43.5Al-4Nb-1Mo (TNM) Third Generation Turbine Blade Material." Doctoral dissertation, Case Western Reserve University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1512601932780114

    Chicago Manual of Style (17th edition)

case1512601932780114
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This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.