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Effects of microstructural factors on quasi-static and dynamic deformation behaviors of Ti-6Al-4V alloys with widmanstätten structures

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Abstract

The effects of microstructural factors on the quasi-static tensile and dynamic torsional deformation behaviors in Ti-6Al-4V alloys with Widmanstätten structures were investigated in this study. Dynamic torsional tests were conducted using a torsional Kolsky bar for five Widmanstätten structures, in which microstructural parameters such as colony size and α lamellar spacing were varied by heat treatments, and then the test data were analyzed in relation to microstructures, tensile properties, and fracture mode. Under dynamic torsional loading, maximum shear stress was largely dependent on colony size, whereas shear strain at the maximum shear stress point was on colony size as well as α lamellar spacing. Adiabatic shear bands were found in the deformed area of the fractured torsional specimens, and their width was smallest in the structure whose colony size and α lamellar spacing were both large. The possibility of the adiabatic shear band formation was quantitatively analyzed in relation to microstructural factors. It was the highest in the coarse Widmanstätten structure, which was confirmed by the theoretical critical shear strain (υ c ) condition for the adiabatic shear band formation.

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Authors and Affiliations

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

    Dong-Geun Lee (Research Assistant), Sunghak Lee (Professor) & Chong Soo Lee (Professor)

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

    Sunghak Lee (Professor) & Chong Soo Lee (Professor)

  3. the Agency for Defense Development, 605-600, Daejeon, Korea

    Sunmoo Hur (Principal Researcher)

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  1. Dong-Geun Lee
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  2. Sunghak Lee
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  3. Chong Soo Lee
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  4. Sunmoo Hur
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Lee, DG., Lee, S., Lee, C.S. et al. Effects of microstructural factors on quasi-static and dynamic deformation behaviors of Ti-6Al-4V alloys with widmanstätten structures. Metall Mater Trans A 34, 2541–2548 (2003). https://doi.org/10.1007/s11661-003-0013-4

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  • DOI: https://doi.org/10.1007/s11661-003-0013-4

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