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Effect of Heat Treatment on the Microstructure and Micro-mechanical Behavior of Quenched Ti-6Al-4V Alloy

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Abstract

To determine the influence of the solution treatment temperature and holding time on the microstructure and micro-mechanical behavior of Ti-6Al-4V alloys, micro-indentation experiments were conducted at maximum loads of 3000, 3500, 4500, 4600, 4700, 4800, and 4900 mN. A microstructure examination was also performed with an optical microscope. Based on the test data, the micro-hardness H, Young’s modulus E, yield strength σy, ultimate tensile strength σ b , and strain-hardening exponent n were obtained by the Oliver-Pharr method. It was found that the solution treatment temperature and holding time had a significant influence on the morphology, size, and volume fraction of the α and β phases. The equiaxed microstructure (obtained at 950 °C) exhibits a higher H, E, and σb. In contrast, σy shows a downward trend over the entire range of solution treatment temperatures. The influences of holding time on H, E, σb, and σy were also significant.

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Acknowledgment

The authors are very grateful for the support received from the National Natural Science Foundation of China (Grant No. 51275414), the Aeronautical Science Foundation of China (Grant No. 2011ZE53059), the Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University (Grant No. Z2015064), and the Province Natural Science Foundation of Shaanxi (Grant No. 2015JM5204).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Xinkai Ma, Fuguo Li, Jinghui Li, Jun Cao, Pan Li & Junzhe Dong

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  1. Xinkai Ma
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Correspondence to Fuguo Li.

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Ma, X., Li, F., Li, J. et al. Effect of Heat Treatment on the Microstructure and Micro-mechanical Behavior of Quenched Ti-6Al-4V Alloy. J. of Materi Eng and Perform 24, 3761–3772 (2015). https://doi.org/10.1007/s11665-015-1682-z

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