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Influence of heat treated microstructures on the dynamic deformation characteristics of Ti-6Al-4V alloy

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Abstract

We investigated the influence of heat treated microstructures, namely, equiaxed, bimodal and lamella types of Ti–6Al–4V alloy on the dynamic deformation characteristics. Four different heat treatment conditions were employed for the development of the microstructures. Static tensile and compressive deformation tests were preliminarily performed with hydraulic test equipment. Dynamic deformation tests at a high level of strain rate, 2700 s−1 ∼ 6400 s−1, together with high velocity impact tests were, respectively, conducted on the specimens through a compressive Split Hopkinson pressure bar (SHPB) and a high pressure gas gun system. The dependence of flow stress on the strain rate associated with the corresponding microstructure was examined. The microstructural factors on the dynamic fracture characteristics were analyzed by scanning electron microscopy. The static compressive tests showed that the flow stress was greatest in the lamella microstructure and decreased in the order of lamella, bimodal and equiaxed microstructures, whereas the ductility was largest in the bimodal microstructure and smallest in the lamellar microstructure. In dynamic compressive tests, a similar dependency of the flow stress on microstructures was observed: highest in the lamellar microstructure and lowest in the equiaxed microstructure. The ductility, such as strain at maximum stress or at failure, was highest in the equiaxed microstructure and lowest in the lamellar structure. In addition, the ductility for individual microstructure decreased as the strain rate increased. Every microstructure exhibited ductile fracture surfaces, and it seems that a large shear crack on the lateral surface in the specimen was the main factor inducing the final failure. The result of high velocity impact test exhibited that the resistance to fracture of equiaxed microstructure with superior dynamic toughness was much higher than that of lamella microstructure with inferior dynamic toughness. The results obtained help provide a fundamental idea and guide to improve the dynamic mechanical properties of Ti-6Al-4V alloy through the microstructure control.

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Authors and Affiliations

  1. Department of Mechcanical Design Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-Gu, Daejeon, 305-764, Korea

    Yongseok Seo & Young-Shin Lee

  2. Survivability Technology Defense Research Center, Hanyang University, 17 Haengdang-Dong, Sungdong-Gu, Seoul, 133-791, Korea

    Sung-Choong Woo

  3. School of Mechanical Engineering, Hanyang University, 17 Haengdang-Dong, Sungdong-Gu, Seoul, 133-791, Korea

    Tae-Won Kim

Authors
  1. Yongseok Seo
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  2. Sung-Choong Woo
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  3. Tae-Won Kim
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  4. Young-Shin Lee
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Corresponding author

Correspondence to Young-Shin Lee.

Additional information

Recommended by Associate Editor Youngseog Lee

Yongseok Seo earned a B.S. of Mechanical Engineering from Chonnam national University in 1987. He was awarded a M.S. Degree in Mechanical Engineering from Chonnam National University in 1990. He currently serves as a Principle Researcher in Agency for Defense Development. He is interesting in the area of impact mechanics and hydrodynamics.

YoungShin Lee received a B.S. degree in Mechanical Engineering from Yonsei University, Korea in 1972. He received master and Ph.D. in Mechanical Engineering from Yonsei University, Korea in 1974 and 1980, respectively. He is currently professor of Department of Mechanical Design Engineering at Chungnam National University, Korea. Prof. Lee's research interests are in area of impat mechnics, optimal design, biomechanical nanlysis and shell structure analysis.

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Seo, Y., Woo, SC., Kim, TW. et al. Influence of heat treated microstructures on the dynamic deformation characteristics of Ti-6Al-4V alloy. J Mech Sci Technol 29, 5223–5232 (2015). https://doi.org/10.1007/s12206-015-1122-x

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  • DOI: https://doi.org/10.1007/s12206-015-1122-x

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