A comprehensive study on the fabrication and characterization of Ti–48Al–2Cr–2Nb preforms manufactured using electron beam melting

Cakmak, Ercan; Nandwana, Peeyush; Shin, Dongwon; Yamamoto, Yukinori; Gussev, Maxim N.; Sen, Indrani; Seren, Mehmet Hazar; Watkins, Thomas R.; Haynes, James Allen

doi:10.1016/j.mtla.2019.100284

Title: A comprehensive study on the fabrication and characterization of Ti–48Al–2Cr–2Nb preforms manufactured using electron beam melting

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Abstract

This feasibility study examines the additive manufacturing of Ti–48Al–2Cr–2Nb preforms in a quest to make more complex engine components from this promising but hard to machine, brittle material. The preforms are built using the electron beam melting technique; hot isostatic pressing (HIP) was performed as the only post-process. Microstructural characterizations were carried with scanning electron microscopy techniques, X-ray diffraction and X-ray computed tomography while mechanical properties were obtained via tensile testing. We exploited computational thermodynamic modeling (widely known as CALPHAD) approach to investigate the phase stability pertinent to Nb and Cr modified TiAl. Defect-free structures were obtained in the HIPed condition with mechanical behavior comparable to/better than traditionally manufactured counterparts. Equiaxed duplex microstructures were achieved in the as-built condition that were sustained post-HIP. The effect of the build conditions and phase transformation kinetics on the observed microstructures is discussed. Furthermore, the microstructure-mechanical behavior relationship is also discussed.

Authors:

^[1];

^[1]; Sen, Indrani ^[2]; Seren, Mehmet Hazar ^[3];

^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Indian Institute of Technology, Kharagpur (India)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Columbia Univ., New York, NY (United States)

Publication Date:: Thu Mar 07 00:00:00 EST 2019

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

OSTI Identifier:: 1523748

Alternate Identifier(s):: OSTI ID: 1637247

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Materialia

Additional Journal Information:: Journal Volume: 6; Journal Issue: C; Journal ID: ISSN 2589-1529

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Additive manufacturing; Titanium aluminide; CALPHAD; X-ray computed tomography; Scanning electron microscopy (SEM); X-ray diffraction

Citation Formats


                    Cakmak, Ercan, Nandwana, Peeyush, Shin, Dongwon, Yamamoto, Yukinori, Gussev, Maxim N., Sen, Indrani, Seren, Mehmet Hazar, Watkins, Thomas R., and Haynes, James Allen. A comprehensive study on the fabrication and characterization of Ti–48Al–2Cr–2Nb preforms manufactured using electron beam melting.  United States: N. p., 2019. 
Web.  doi:10.1016/j.mtla.2019.100284.

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                    Cakmak, Ercan, Nandwana, Peeyush, Shin, Dongwon, Yamamoto, Yukinori, Gussev, Maxim N., Sen, Indrani, Seren, Mehmet Hazar, Watkins, Thomas R., & Haynes, James Allen. A comprehensive study on the fabrication and characterization of Ti–48Al–2Cr–2Nb preforms manufactured using electron beam melting.  United States.  https://doi.org/10.1016/j.mtla.2019.100284

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                    Cakmak, Ercan, Nandwana, Peeyush, Shin, Dongwon, Yamamoto, Yukinori, Gussev, Maxim N., Sen, Indrani, Seren, Mehmet Hazar, Watkins, Thomas R., and Haynes, James Allen. Thu .  
"A comprehensive study on the fabrication and characterization of Ti–48Al–2Cr–2Nb preforms manufactured using electron beam melting".  United States.  https://doi.org/10.1016/j.mtla.2019.100284.  https://www.osti.gov/servlets/purl/1523748.

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@article{osti_1523748,

  title        = {A comprehensive study on the fabrication and characterization of Ti–48Al–2Cr–2Nb preforms manufactured using electron beam melting},

  author       = {Cakmak, Ercan and Nandwana, Peeyush and Shin, Dongwon and Yamamoto, Yukinori and Gussev, Maxim N. and Sen, Indrani and Seren, Mehmet Hazar and Watkins, Thomas R. and Haynes, James Allen},

  abstractNote = {This feasibility study examines the additive manufacturing of Ti–48Al–2Cr–2Nb preforms in a quest to make more complex engine components from this promising but hard to machine, brittle material. The preforms are built using the electron beam melting technique; hot isostatic pressing (HIP) was performed as the only post-process. Microstructural characterizations were carried with scanning electron microscopy techniques, X-ray diffraction and X-ray computed tomography while mechanical properties were obtained via tensile testing. We exploited computational thermodynamic modeling (widely known as CALPHAD) approach to investigate the phase stability pertinent to Nb and Cr modified TiAl. Defect-free structures were obtained in the HIPed condition with mechanical behavior comparable to/better than traditionally manufactured counterparts. Equiaxed duplex microstructures were achieved in the as-built condition that were sustained post-HIP. The effect of the build conditions and phase transformation kinetics on the observed microstructures is discussed. Furthermore, the microstructure-mechanical behavior relationship is also discussed.},

  doi          = {10.1016/j.mtla.2019.100284},

  journal      = {Materialia},

  number       = C,

  volume       = 6,

  place        = {United States},

  year         = {Thu Mar 07 00:00:00 EST 2019},

  month        = {Thu Mar 07 00:00:00 EST 2019}

}

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