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Effects of volume fraction of tempered martensite on dynamic deformation properties of a Ti-6Al-4V alloy having a bimodal microstructure

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Abstract

The effects of the volume fraction of tempered martensite on the tensile and dynamic deformation properties of a Ti-6Al-4V alloy having a bimodal microstructure were investigated in this study. Five microstructures having various tempered-martensite volume fractions were obtained by varying heat-treatment conditions. Dynamic torsional tests were conducted on them using a torsional Kolsky bar. The test data were analyzed in relation to microstructures, tensile properties, and adiabatic shear-band formation. Under a dynamic loading condition, the maximum shear stress increased with increasing tempered-martensite volume fraction, whereas the fracture shear strain decreased. Observation of the deformed area after the dynamic torsional test indicated that a number of voids initiated mainly at α-phase/tempered-martensite interfaces, and that the number of voids increased with increasing martensite volume fraction. Adiabatic shear bands of 6 to 10 μm in width were formed in the specimens having lower martensite volume fractions, while they were not formed in those having higher martensite volume fractions. The possibility of adiabatic shear-band formation was explained by concepts of absorbed deformation energy and void initiation.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784, Pohang, Korea

    Dong-Geun Lee (Postdoctoral Research Associate) & You Hwan Lee (Research Assistant)

  2. Center for Advanced Aerospace materials, Pohang University of Science and Technology, Pohang, Korea

    Chong Soo Lee (Professors) & Sunghak Lee (Professors)

Authors
  1. Dong-Geun Lee
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  2. You Hwan Lee
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  3. Chong Soo Lee
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  4. Sunghak Lee
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jointly appointed with the Materials Science and Engineering Department, Pohang University of Science and Technology

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Lee, DG., Lee, Y.H., Lee, C.S. et al. Effects of volume fraction of tempered martensite on dynamic deformation properties of a Ti-6Al-4V alloy having a bimodal microstructure. Metall Mater Trans A 36, 741–748 (2005). https://doi.org/10.1007/s11661-005-1005-3

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  • DOI: https://doi.org/10.1007/s11661-005-1005-3

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