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Licensed Unlicensed Requires Authentication Published by De Gruyter November 29, 2018

Hot torsion behavior of SP-700 near beta titanium alloy in single and dual phase regions

Amir Hosein Sheikhali , Maryam Morakkabati and Seyed Mahdi Abbasi


Hot deformation behavior of the SP-700 alloy is studied through continuous and interrupted hot torsion testing carried out at 850 and 1 000 °C at different pass-strains and inter-pass times. The flow curves of SP-700 alloy showed the discontinuous yield stress, which is followed by the steady state region. The dominant mechanism of softening in hot deformation at 1 000 °C was dynamic recrystallization (DRX), whereas at 850 °C serration and tanglement of the grain boundaries were observed. Nevertheless, the microstructure of the sample twisted at 850 °C indicated the occurrence of DRX and the formation of fine grains in the vicinity of grain boundaries and triple points by the bulging mechanism. With an increase in the pass-strain of interrupted torsion at 1 000 °C, due to the increase in driving force for nucleation and growth of new grains, the kinetics of static restoration increased. However, due to the completion of DRX, the kinetics rate of static restoration at steady state strain (s) was lower than that of the former state. The β → α phase transformation at 850 °C was found to be another factor contributing in fractional softening.

*Correspondence address, Dr Seyed Mahdi Abbasi, No. 15, Qaffar-nazari Alley, Heydary Avenue, Damavand Street, Tehran, Iran, Postal code: 1745953881, Tel.: +982177430446, Fax: +982177430446, E-mail:


[1] Military Handbook 5J, Department of Defense Handbook: Metallic materials and elements for aerospace vehicle structures, Wright-Patterson AFB, OH. Materials Directorate (2003) 110.Search in Google Scholar

[2] M.J.Tan, S.F.Hassan, in: M.Ninomi, S.Akiyama, M.Ikeda, M.Hagiwara, K.Maruyama (Eds.), Ti-2007 Science and Technology, Japan (2007) 567.Search in Google Scholar

[3] Y.H.Lin, S.M.Wu, F.H.Kao, S.H.Wang, J.R.Yang, C.C.Yang, C.S.Chiou: Mater. Sci. Eng. A528 (2011) 2271. 10.1016/j.msea.2010.12.027Search in Google Scholar

[4] A.Ogawa, M.Niikura, C.Ouchi, K.Minikawa, M.Yamada: J. Test. Eval.24 (1996) 165.Search in Google Scholar

[5] B.Gunawarman, M.Niinomi, T.Akahori, J.Takeda, H.Toda: Mater. Sci. Eng. C25 (2005) 296. 10.1016/j.msec.2004.12.012Search in Google Scholar

[6] J.Nieha, S.L.Lee, K.S.Pan: Int. J. Mater. Res.106 (2015) 1. 10.3139/146.015012Search in Google Scholar

[7] Gunawarman, M.Niinomi, D.Eylon, S.Fujishiro, C.Ouchi, T.Kazino: Metall. Mater. Trans. A34 (2003) 267. 10.1007/s11661-003-0328-1Search in Google Scholar

[8] Y.H.Lin, K.H.Hu, F.H.Kao, S.H.Wang, J.R.Yang, C.K.Lin: Mater. Sci. Eng. A528 (2011) 4381. 10.1016/j.msea.2011.02.013Search in Google Scholar

[9] L.W.Zhu, X.N.Wang, Y.Fei, J.Li, Z.S.Zhu: Mater. Sci. Forum 849, Trans Tech Pub., Switzerland (2016) 309. 10.4028/ in Google Scholar

[10] H.Fukai, K.Minakawa, C.Ouchi: ISIJ International44 (2004) 1911. 10.2355/isijinternational.44.1911Search in Google Scholar

[11] I.Weiss, S.L.Semiatin: Mater. Sci. Eng. A243 (1998) 46. 10.1016/S0921-5093(97)00783-1Search in Google Scholar

[12] S.L.Semiatin, V.Seetharaman, I.Weiss: JOM (1997) 33. 10.1007/BF02914711Search in Google Scholar

[13] L.He, A.Dehghan-Manshadi, R.J.Dippenaar: Mater. Sci. Eng.A549 (2012) 163. 10.1016/j.msea.2012.04.025Search in Google Scholar

[14] P.Vo, M.Jahazi, S.Yue: Metall. Mater. Trans. A39 (2008) 2965. 10.1007/s11661-008-9666-3Search in Google Scholar

[15] S.L.Semiatin, V.Seetharaman, I.Weiss: Mater. Sci. Eng. A263 (1999) 257. 10.1016/S0921-5093(98)01156-3Search in Google Scholar

[16] AMS 4899C: Titanium Alloy, Sheet, Strip, and Plate Ti-4.5Al-3V-2Fe-2Mo Annealed, ASTM Int., PA (2011).Search in Google Scholar

[17] AMS 4964C: Titanium Alloy Bars, Wire, Forgings, and Rings Ti-4.5Al-3V-2Fe-2Mo Annealed, ASTM Int., PA (2011).Search in Google Scholar

[18] ASTM A938–07: Standard Test Method for Torsion Testing of Wire, ASTM Int., PA (2013).Search in Google Scholar

[19] S.Sadeghpour, S.M.Abbasi, M.Morakabati: J. Alloys Compd.650 (2015) 22. 10.1016/j.jallcom.2015.07.263Search in Google Scholar

[20] A.Dehghan-Manshadi, R.J.Dippenaar: Mater. Sci. Eng. A552 (2012) 451. 10.1016/j.msea.2012.05.069Search in Google Scholar

[21] W. Ch.Chung, L.W.Tsay, C.Chen: Mater. Trans.50 (2009) 544. 10.2320/matertrans.MRA2008370Search in Google Scholar

[22] R.Srinivasan, I.Weiss, in: D.Eylon, R.R.Boyer, D.A.Koss (Eds.), Proceeings of a Symposium on Beta titanium alloys in the 1990's, Colorado (1993) 283.Search in Google Scholar

[23] P.Wanjara, M.Jahazi, H.Monajati, S.Yue, J.-P.Immarigeon: Mater. Sci. Eng. A396 (2005) 50. 10.1016/j.msea.2004.12.005Search in Google Scholar

[24] I.Philippart, H.J.Rack: Mater. Sci. Eng. A243 (1998) 196. 10.1016/S0921-5093(97)00800-9Search in Google Scholar

[25] A.H.Sheikhali, M.Morakkabati, S.M.Abbasi, A.Rezaei: Int. J. Mater. Res.104 (2013) 1122. 10.3139/146.110965Search in Google Scholar

[26] S.L.Semiatin, G.D.Lahoti: Metall. Trans. A12 (1981) 1719. 10.1007/BF02643753Search in Google Scholar

[27] S.H.Cho, Y.C.Yoo: J. Mater. Sci.36 (2001) 4279. 10.1023/A:1017544000562Search in Google Scholar

[28] A.Dehghan-Manshadi, M.R.Barnett, P.D.Hodgson: Metall. Mater. Trans. A39 (2008) 1371. 10.1007/s11661-008-9512-7Search in Google Scholar

[29] S.H.Cho, Y.C.Yoo: J. Mat. Sci.36 (2001) 4267. 10.1023/A:1017544000562Search in Google Scholar

[30] O.M.Ivasishin, P.E.Markovsky, Y.V.Matviychuk, S.L.Semiatin: Metall. Mater. Trans.34 A (2003) 147. 10.1007/s11661-003-0216-8Search in Google Scholar

[31] A.Najafizadeh, J.J.Jonas, G.R.Stewart, E.I.Poliak: Metal. Mat. Trans. A37 (2006) 1899. 10.1007/s11661-006-0132-9Search in Google Scholar

[32] A.Najafizadeh, J.J.Jonas: Int. J. ISSI3 (2006) 1.Search in Google Scholar

[33] A.Dehghan-Manshadi, M.R.Barnett, P.D.Hodgson: Mater. Sci. Eng. A485 (2008) 664. 10.1016/j.msea.2007.08.026Search in Google Scholar

[34] J.J.Jonas, C.Aranas, A.Fall, M.Jahazi: Mater. Des.113 (2017) 305. 10.1016/j.matdes.2016.10.039Search in Google Scholar

Received: 2018-03-28
Accepted: 2018-07-23
Published Online: 2018-11-29
Published in Print: 2018-12-10

© 2018, Carl Hanser Verlag, München

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