Effect of Stress Relieving Heat Treatment on the Microstructure and High-Temperature Compressive Deformation Behavior of Ti-6Al-4V Alloy Manufactured by Selective Laser Melting
- 238 Downloads
This study aims to investigate the effect of stress relieving heat treatment on the microstructure and high-temperature compressive deformation behavior of the Ti-6Al-4V alloy, manufactured by selective laser melting. Initial microstructural observation confirmed elongated prior β grains in the building direction of both specimens (as-fabricated and heat-treated specimens). Along with such, the as-fabricated specimen only featured α′-martensite phase, while the heat-treated specimen featured α′-martensite and some α and β phases. Compression tests carried out at room temperature gave yield strengths of 1365 and 1138 MPa for the as-fabricated and heat-treated specimens, respectively. Such values are similar or greater than those of commercial wrought materials. The compressive fracture strain significantly increased after heat treatment. There was a general tendency of reducing yield strength as compressive temperatures increased. At temperatures greater than 700 °C, the as-fabricated and heat-treated specimens achieved similar strength. Microstructural observation after deformation confirmed that the initial microstructure was retained up to temperatures of 500 °C. At 700 °C or greater, both specimens showed drastic microstructural evolution.
This research was supported by the Korean Institute of Materials Science, Korea.
- 10.M. Simonelli, Y.Y. Tse, and C. Tuck: Annual International Solid Freeform Fabrication Symposium, University of Texas, Austin, TX, 2012.Google Scholar
- 11.R.A. Wood: Titanium Alloy Handbook, Metals and Ceramics Information Center, Battelle, Columbus, OH, Dec 1972, publication no. MCIC-HB-02.Google Scholar
- 13.M.K. Mcquillan: J. Metall. Rev., 1963, vol. 8, pp. 41–104.Google Scholar
- 19.G.M.T. Haar and T.H. Becker: Materials, 2018, vol. 11(1), p. 146.Google Scholar
- 26.T. Becker, M.V. Rooyen, and D. Dimitrov: S. Afr. J. Ind. Eng., 2015, vol. 26, pp. 93–103.Google Scholar
- 35.M. Vanderhasten, L. Rabet, and B. Verlinden: Metalurgija, 2005, vol. 11, pp. 195–200.Google Scholar