TC21 is
considered a new titanium alloy that is used in aircraft applications as a
replacement for the famous Ti-6Al-4V alloy due to its high strength. The effect
of single and duplex stage heat treatments on fatigue behavior of TC21 Ti-alloy
(Ti-6Al-2Sn-2Zr-3Mo-1Cr-2Nb-0.09Si, wt.%) was investigated. Two heat treatment
cycles were applied on as-received TC21 Ti-alloy. The first cycle was called
single stage heat treatment (SSHT). The other cycle was named duplex stage heat
treatment (DSHT). Typical microstructures of SSHT & DSHT composed of
primary equiaxed α phase, residual β phase and secondary α phase (α
References
[1]
Lütjering, G. and Williams, J.C. (2007) Titanium. 2nd Edition, Springer, Berlin Heidelberg, New York.
[2]
Banerjee, D. and Williams, J.C. (2013) Perspectives on Titanium Science and Technology. Acta Materialia, 61, 844-879. https://doi.org/10.1016/j.actamat.2012.10.043
[3]
Ibrahim, K.M., EL-Hakeem, A.M. and Elshaer, R.N. (2013) Microstructure and Mechanical Properties of Cast and Heat Treated Ti-6.55Al-3.41Mo-1.77Zr Alloy. Transactions of Nonferrous Metals Society of China, 23, 3517-3524. https://doi.org/10.1016/S1003-6326(13)62896-4
[4]
Lia, G., Xia, F., Gao, Y. and He, Y. (2016) Microstructure Control Techniques in Primary Hot Working of Titanium Alloy Bars: A review. Chinese Journal of Aeronautics, 29, 30-40. https://doi.org/10.1016/j.cja.2015.07.011
[5]
Tang, B., Kou, H.-C., Wang, Y.-H., Zhu, Z.-S., Zhang, F.-S. and Li, J.-S. (2012) Kinetics of Orthorhombic Martensite Decomposition in TC21 Alloy under Isothermal Conditions. Journal of Materials science, 47, 521-529. https://doi.org/10.1007/s10853-011-5829-5
[6]
Wang, Y.-H., Kou, H.-C., Chang, H., Zhu, Z.-S., Zhang, F.-S., Li, J.-S. and Zhou, L. (2009) Influence of Solution Temperature on Phase Transformation of TC21 Alloy. Materials Science and Engineering: A, 508, 76-82. https://doi.org/10.1016/j.msea.2008.12.019
[7]
Wu, G.-Q., Shi, C.-L., Sha, W., Sha, A.-X. and Jiang, H.-R. (2013) Effect of Microstructure on the Fatigue Properties of Ti-6Al-4V Titanium Alloys. Materials and Design, 46, 668-674. https://doi.org/10.1016/j.matdes.2012.10.059
[8]
Davari, N., Rostami, A. and Abbasi, S.M. (2017) Effects of Annealing Temperature and Quenching Medium on Microstructure, Mechanical Properties as Well as Fatigue Behavior of Ti-6Al-4V Alloy. Materials Science & Engineering: A, 683, 1-8. https://doi.org/10.1016/j.msea.2016.11.095
[9]
Everaerts, J., Verlinden, B. and Wevers, M. (2016) The Influence of the Alpha Grain Size on Internal Fatigue Crack Initiation in Drawn Ti-6Al-4V Wires. Procedia Structural Integrity, 2, 1055-1062. https://doi.org/10.1016/j.prostr.2016.06.135
[10]
Schmidt, P., El-Chaikh, A. and Christ, H.-J. (2011) Effect of Duplex Aging on the Initiation and Propagation of Fatigue Cracks in the Solute-Rich Metastable β Titanium Alloy Ti 38-644. Metallurgical and Materials Transactions A, 42, 2652-2667. https://doi.org/10.1007/s11661-011-0662-7
[11]
Elshaer, R.N., Ibrahim, K.M., Barakat, A.F. and Abbas, R.R. (2017) Effect of Duplex Heat Treatment on Tribological Behavior of TC21 Titanium Alloy. Journal of Metallurgical Engineering (ME), 6, 1-15.
[12]
Shao, H., Zhao, Y.-Q., Ge, P. and Zeng, W.-D. (2013) Crack Initiation and Mechanical Properties of TC21 Titanium Alloy with Equiaxed Microstructure. Materials Science & Engineering: A, 586, 215-222. https://doi.org/10.1016/j.msea.2013.08.012
[13]
Wang, K. and Li, M.-Q. (2014) Effects of Heat Treatment and Hot Deformation on the Secondary α Phase Evolution of TC8 Titanium Alloy. Materials Science & Engineering: A, 613, 209-216. https://doi.org/10.1016/j.msea.2014.06.056
[14]
Wood, E.T. (2015) Thermal Processing and Mechanical Properties of Beta Phase Titanium Alloys for Biomedical Applications. Master of Science in Metallurgical Engineering, Montana University, Missoula, Montana.
