The Effect of Annealing Temperature on the High Temperature Deformation Behavior of Ti-5Al-4.2V-0.8 Mo-2Fe α/β Titanium Alloy

Journal of Advanced Materials and Processing

دوره 10، شماره 3، مهر 2022، صفحه 27-35   

نوع مقاله: Research Paper

نویسندگان

Maryam Morakabati^{* 1}؛ Peyman Ahmadian²؛ Parnia Parvizian²

¹Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology

²Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran

چکیده

This paper aims to analyze the effect of annealing temperature on the microstructural changes and the following deformation behavior of Ti-5Al-4.2V-0.8Mo-2Fe α/β titanium alloy at high temperatures. For this purpose, the hot rolled specimens were mill annealed at 700, 750, and 800 °C for 1 hour. The deformation behavior of the milled annealed alloy was assessed using the hot tensile test at the temperature of 750 °C and the strain rate of 0.005 sec^-1. It was found that, by increasing the mill annealing temperature, the layered microstructure changed to the equiaxed one due to static globularization. After the tensile test, the stress-strain curves showed that by decreasing the annealing temperature from 800 to 700 °C, the peak stress decreased and the elongation increased from 362% to 474%. Moreover, the apparent feature of flow curves suggested yield point phenomena as a result of dynamic strain aging. The maximum elongation of 474% was obtained after mill annealing at 700 °C a finding which is correlated with the promoted fine globular α phase with the grain size of 4.5 µm and the 44.5% content of the β phase due to the dynamic globularization.  

کلیدواژه‌ها

α /β titanium alloy؛ mill annealing؛ hot tensile test؛ dynamic globularization؛ dynamic strain aging

مراجع

[1] A.Ogawa, , H. Fukai, K. Minakawa, and C. Ouchi, "SP-700 Titanium Alloy Data Sheets, Beta titanium alloys in the 1990's", Proc. Annual meeting of the Minerals, Metals and Materials Society (TMS); Denver, CO (United States, Warrendale, p.513.

[2] W.Shing-Hoa, , L. Hao-Hsun, , Ch. Chih-Yuan, , Y. Jer-Ren, , and K. Chin-Hai, "The variation of β phase morphology after creep and negative creep for duplex titanium alloys", J. Mate. Sci., Vol. 44, 2009, pp.408-413.

[3] C. Leyens, M. Peters, Titanium and titanium alloys fundamental and applications, Weinheim, Wiley-VCH Verlag, Germany, 2004, p. 49.

[4] E.W. Collings, Materials properties handbook: titanium alloys, Materials Park, ASM International, Ohio, 1994 p. 68.

[5] C. Ouchi, , K. Minakawa, K. Takahashi, A. Ogawa, M. Ishikawa, Development of β-rich α+ β Titanium Alloy SP-700, NKK Tech. Review, 1992.

[6] J. Williams, and R. R. Boyer, "Opportunities and issues in the application of titanium alloys for aerospace components", Metals, Vol. 10, no. 6, 2020, pp. 705.

[7] A. Ogawa, M. Niikura, C. Ouchi, K. Minikawa, M. Yamada, "Development and applications of titanium alloy SP-700 with high formability", J. Test. Evalu., Vol. 24, No. 2, 1996, pp. 100-109.

[8] K. V., Sudhakar, and E. Wood, "Superplastic grade titanium alloy: comparative evaluation of mechanical properties, microstructure, and fracture behavior", J. Mater., Vol. 11, 2016, pp.1-7.

[9] Y. B. Lee, D. H.Shin, K-T. Park, and W. J. Nam, "Effect of annealing temperature on microstructures and mechanical properties of a 5083 Al alloy deformed at cryogenic temperature", Scripta Mater., Vol. 51, 2004, pp. 355-359.

[10] J-K. Nieh, C-T. Wu, Y-L. Chen, Ch-N. Wei, and. Sh-L. Lee, "Effect of cooling rate during solution heat treatment on the microstructure and mechanical properties of SP-700 titanium alloys", J. Mari. Sci. Tech., Vol. 24, No. 2, 2016, pp. 99-106.

[11] C. R. Brooks, Heat treatment, structure and properties of nonferrous alloys, Metals Park, ASM, Ohio, 1982 p. 115.

[12] J. K. Nieh, Sh-L. Lee, and K-S. Pan, "Effect of heat treatment and deformation on the microstructure and mechanical properties of SP-700 titanium alloy", Inter. J. Mate. Res., Vol. 106, No. 12, 2015, pp. 1224-1229.

[13] Y. L. Kao, G. C. Tu, C. A. Huang, and T. T. Liu, "A study on the hardness variation of α-and β-pure titanium with different grain sizes", Mat. Sci. Eng. A, Vol. 398, No. 1-2, 2005, pp. 93-98.

[14] A. Ogawa, H. Iizumi, "Superplasticity and post-spf properties of SP-700" Proc. The conference Titanium ’95: science and technology, vol I, Birmingham, UK, 1995, p. 588.

[15] S. F. Tan, M.J. Hie, "High Temperature Deformation of Titanium SP-700", Proc. The conference Ti-2007 Science and Technology, The Japan Institute of Metals, Japan, 2007, p. 567.

[16] J. Shen, Y. Sun, Y. Ning, H. Yu, Z. Yao and L. Hu "Superplasticity induced by the competitive DRX between BCC beta and HCP alpha in Ti-4Al-3V-2Mo-2Fe alloy", Mat. Char., Vol. 153, 2019, 304-317.

[17] E. Alabort, P. Kontis, D. Barba, K. Dragnevski and RC. Reed "On the mechanisms of superplasticity in Ti–6Al–4V",

Acta Mate., Vol. 105, 2016, 449-463.

[18] AH. Sheikhali, M. Morakabati and SM. Abbasi "Hot torsion behavior of SP-700 near beta titanium alloy in single and dual phase regions", Inter. J. Mat. Res., Vol. 109, 2018, 1136-1145.

[19] Sheikhali AH and Morakabati M " Hot working of SP-700 titanium alloy with lamellar α + β starting structure using a

processing map", Inter. J. Mat. Res., Vol. 111, 2020 (4), 297-306.

[20] P. Parvizian, M. Morakabati, and S. Sadeghpour, "Effect of hot rolling and annealing temperatures on the microstructure and mechanical properties of SP-700 alloy", Inter. J. Min., Metall. Mat., Vol. 27, 2020, pp. 374-383.

[21] Standard Test Method for Determining the Superplastic Properties of Metallic Sheet Materials," ASTM E2448, 2011.

[22] Hot working behavior of near alpha titanium alloy analyzed by mechanical testing and processing map, Maryam Morakabati, Alireza Hajari, Transactions of Nonferrous Metals Society of China, 30, 1560-1573, 2022.

[23] F. Humphreys, and M. Hatherly Recrystallization and related annealing phenomena. 2nd ed, Oxford: Elsevier, England, 2004, p. 457.

[24] C. H. Park, J. W. Won, J.-W. Park, S. Semiatin, and C. S. Lee, "Mechanisms and kinetics of static spheroidization of hot-worked Ti-6Al-2Sn-4Zr-2Mo-0.1 Si with a lamellar microstructure", Metall. Mater. Trans. A, Vol. 43, 2012, pp. 977-985.

[25] S. Semiatin, N. Stefansson, and R. Doherty, "Prediction of the kinetics of static globularization of Ti-6Al-4V", Metall. Mater. Trans. A, Vol. 36, 2005, pp. 1372-1376.

[26] P. Wanjara, M. Jahazi, H. Monajati, S. Yue, J.-P. Immarigeon, "Hot working behavior of near-α alloy IMI834", Mater. Sci. Eng. A, Vol. 396, 2005, pp. 50-60.

[27] I. Philippart, H. J. Rack, "High temperature dynamic yielding in metastable Ti–6.8Mo–4.5F–1.5Al", Mater. Sci. Eng. A, Vol. 243, 1998, pp. 196-200.

[28] Du, Z., Liu, J., Li, G., Lv, K., Yan L. , Chen, Y., "Low-temperature superplastic behavior of β titanium alloy", Mater. Sci. Eng. A, 2016, vol. 650, pp. 414-421.

[29] A.K.M. Nurul Amin, Titanium alloys- towards achieving enhanced properties for diversified applications: IntechOpen, 2012,1nd ed, p. 145.

[30] X. Zhang, L. Cao, Y. Zhao, Y. Chen, X. Tian, and J. Deng, "Superplastic behavior and deformation mechanism of Ti600 alloy", Mater. Sci. Eng. A, 2013, vol. 560, pp. 700-704.