Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Samples Fabricated by Selective Laser Melting

Abstract:

Article Preview

Ti-6Al-4V (wt%) alloy samples with dog-bone and box shapes respectively were fabricated by selective laser melting (SLM). The microstructures and mechanical properties of the 3D printed Ti-6Al-4V samples with and without heat treatment were characterized and tested. The microstructures of the as-fabricated dog-bone shaped samples were mainly composed of acicular α’ phase. After annealing at 700°C, the acicular α’ phase changed into an α/β lamellar structure. After solution treatment at 955°C, water quenching and aging at 550°C, the microstructure was mainly composed of primary α phase and α/β lamellar structure. The optimum heat treatment is annealing, and the mechanical properties of the annealed sample are as follows: yield strength: 1015 MPa, ultimate tensile strength (UTS): 1083 MPa and elongation to fracture: 7.9%. The microstructures of the box-shaped samples after annealing mainly consist of α phase and α/β lamellar structure. When stretched along the direction parallel to the crystal growth direction, the yield strength and UTS of the sample are 1054 and 1090 MPa,and its elongation to fracture is 6.3%. When stretched along the direction perpendicular to the crystal growth direction, the yield strength and UTS of the sample are 1019 and 1068 MPa respectively, and its elongation to fracture is 8.7%.

Info:

Periodical:

Edited by:

Huiping Tang, Ma Qian, Yong Liu, Peng Cao and Gang Chen

Pages:

179-186

Citation:

J. B. Gao et al., "Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Samples Fabricated by Selective Laser Melting", Key Engineering Materials, Vol. 770, pp. 179-186, 2018

Online since:

May 2018

Export:

Price:

$38.00

* - Corresponding Author

[1] Y.S. Shi, 3D printing technology for industrial applications and industrial development, Machine Design and Manufacturing Engineering. 45 (2016) 11-16.

[2] L.E. Murr, E. Martinez, K.N. Amato, et al, Fabrication of metal and alloy components by additive manufacturing: Examples of 3D materials science, J. Mat. Res. and Tech. 1 (2012) 42−54.

[3] D.D. Gu, W. Meiners, K. Wissenbach, et al, Laser additive manufacturing of metallic components: materials, processes and mechanisms, International Materials Reviews. 57 (2012) 133−164.

[4] W. Xu, M. Brandt, S. Sun, J. Elambasseril, Q. Liu, K. Latham, K. Xia, M. Qian, Additive manufacturing of strong and ductile Ti-6Al-4V by selective laser melting via in situ martensite decomposition, Acta Materialia. 85 (2015) 74-84.

[5] M. Qian , W. Xu , M. Brandt , H.P. Tang, Additive manufacturing and postprocessing of Ti-6Al-4V for superior mechanical properties, MRS Bulletin. 41 (2016) 775-783.

[6] Y.Q. Zhao, Y.N. Chen, Phase transformations and heat treatments of titanium alloys, Central South University Press, Chang Sha, (2012).

[7] Q. Huang, X. Liu, X. Yang, et al, Specific heat treatment of selective laser melted Ti-6Al-4V for biomedical applications, Frontiers of Materials Science. 9 (2015) 373−381.

[8] H.Y. Yang, J. Chen, Y.Q. Zhao, Effect of the heat treatment on microstructures and mechanical properties of the TC4-DT titanium alloy, Development and Application of Materials. 24 (2009) 13−16.

[9] D. Chen, P.Y. Huang, Mechanical properties of pure titanium and titanium alloys at cryogenic temperatures, Mining and Metallurgical Engineering. 22 (2002) 111-114.

[10] L. Thijs, F. Verhaege, T. Craeghs, et al, A study of the microstructural evolution during selective laser melting of Ti-6Al-4V, Acta Materialia. 58 (2010) 3303−3312.

Fetching data from Crossref.
This may take some time to load.