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Metallurgical and Materials Transactions A

, Volume 36, Issue 13, pp 741–748 | Cite as

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

  • Dong-Geun Lee
  • You Hwan Lee
  • Chong Soo Lee
  • Sunghak Lee
Article

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.

Keywords

Martensite Material Transaction Scanning Electron Micro Adiabatic Shear Adiabatic Shear Band 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals Metals and Materials Society 2005

Authors and Affiliations

  • Dong-Geun Lee
    • 1
  • You Hwan Lee
    • 1
  • Chong Soo Lee
    • 2
  • Sunghak Lee
    • 2
  1. 1.Center for Advanced Aerospace MaterialsPohang University of Science and TechnologyPohangKorea
  2. 2.Center for Advanced Aerospace materialsPohang University of Science and TechnologyPohangKorea

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