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Strain rate sensitivity, temperature sensitivity, and strain hardening during the isothermal compression of BT25y alloy

Published online by Cambridge University Press:  30 August 2016

Xuemei Yang ,
Hongzhen Guo ,
Zekun Yao  and
Shichong Yuan
Xuemei Yang*
Affiliation:
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Hongzhen Guo
Affiliation:
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Zekun Yao
Affiliation:
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Shichong Yuan
Affiliation:
China National Erzhong Group Co., Deyang 618013, People's Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The high-temperature flow behavior and flow stress sensitivity of BT25y alloy were investigated. Results show that hot deformation is accompanied by the dynamic competition between work hardening and flow softening. The strain rate sensitivity exponent m tends to decrease with the strain rate after a first rise, and reaches the maximum at strain rate of 0.1 s−1. There is a large temperature range exhibiting m values above 0.2 at strain rates of 0.01–0.1 s−1. The temperature sensitivity exponent s shows an overall dropping trend with elevated temperature. The strain hardening exponent n first decreases and then increases with the strain at strain rate of 0.01 s−1. Large positive n values lie in areas with high strain rate, and small negative n values are located in areas with lower temperature and small strain rate. Secondary lamellar α appears near the phase transition temperature. The microstructure presents elongated characteristics at high strain rate.

Keywords

BT25y alloyhot pressingsensitivity exponent
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 18: Focus Section: Reinventing Boron Chemistry for the 21st Century , 28 September 2016 , pp. 2863 - 2875
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Copyright
Copyright © Materials Research Society 2016 

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References

REFERENCES

Ezugwu, E.O. and Wang, Z.M.: Titanium alloys and their machinability—A review. J. Mater. Process. Technol. 68(3), 262 (1997).Google Scholar
Wang, T., Guo, H.Z., Wang, Y.W., Peng, X.N., Zhao, Y., and Yao, Z.K.: The effect of microstructure on tensile properties, deformation mechanisms and fracture models of TG6 high temperature titanium alloy. Mater. Sci. Eng., A 528(6), 2370 (2011).Google Scholar
Ma, X., Zeng, W.D., Tian, F., and Zhou, Y.G.: The kinetics of dynamic globularization during hot working of a two phase titanium alloy with starting lamellar microstructure. Mater. Sci. Eng., A 548, 6 (2012).Google Scholar
Yang, X.M., Guo, H.Z., Liang, H.Q., Yao, Z.K., and Yuan, S.C.: Flow behavior and constitutive equation of Ti–6.5Al–2Sn–4Zr–4Mo–1W–0.2Si titanium alloy. J. Mater. Eng. Perform. 25(4), 1347 (2016).CrossRefGoogle Scholar
Moiseyev, V.N.: Titanium Alloys: Russian Aircraft and Aerospace Applications (CRC Press, New York, USA, 2006); p. 21.Google Scholar
Wang, K.X., Zeng, W.D., Zhao, Y.Q., Lai, Y.J., and Zhou, Y.G.: Dynamic globularization kinetics during hot working of Ti17 alloy with initial lamellar microstructure. Mater. Sci. Eng., A 527, 2559 (2010).Google Scholar
Ma, X., Zeng, W.D., Tian, F., Sun, Y., and Zhou, Y.G.: Modeling constitutive relationship of BT25 titanium alloy during hot deformation by artificial neural network. J. Mater. Eng. Perform. 21(8), 1591 (2012).Google Scholar
Nan, Y., Ning, Y.Q., Liang, H.Q., Guo, H.Z., Yao, Z.K., and Fu, M.W.: Work-hardening effect and strain-rate sensitivity behavior during hot deformation of Ti–5Al–5Mo–5V–1Cr–1Fe alloy. Mater. Des. 82, 84 (2015).Google Scholar
Liang, H.Q., Nan, Y., Ning, Y.Q., Li, H., Zhang, J.L., Shi, Z.F., and Guo, H.Z.: Correlation between strain-rate sensitivity and dynamic softening behavior during hot processing. J. Alloys Compd. 632, 478 (2015).Google Scholar
Liu, Y.H., Ning, Y.Q., Yang, X.M., Yao, Z.K., and Guo, H.Z.: Effect of temperature and strain rate on the workability of FGH4096 superalloy in hot deformation. Mater. Des. 95, 669 (2016).Google Scholar
Luo, J. and Li, M.Q.: Strain rate sensitivity and strain hardening exponent during the isothermal compression of Ti60 alloy. Mater. Sci. Eng., A 538, 156 (2012).CrossRefGoogle Scholar
Lee, W.S., Lin, C.F., Chen, T.H., and Hwang, H.H.: Effects of strain rate and temperature on mechanical behavior of Ti–15Mo–5Zr–3Al alloy. J. Mech. Behav. Biomed. Mater. 1(4), 336 (2008).Google Scholar
Chiou, S.T., Tsai, H.L., and Lee, W.S.: Impact mechanical response and microstructural evolution of Ti alloy under various temperatures. J. Mater. Process. Technol. 209(5), 2282 (2009).CrossRefGoogle Scholar
Lee, W.S. and Lin, C.F.: High-temperature deformation behavior of Ti6Al4V alloy evaluated by high strain-rate compression tests. J. Mater. Process. Technol. 5(1–3), 127 (1998).Google Scholar
Seshacharyulu, T., Medeiros, S.C., Frazier, W.G., and Prasad, Y.V.R.K.: Hot working of commercial Ti–6Al–4V with an equiaxed α – β microstructure: Materials modeling considerations. Mater. Sci. Eng., A 284(1–2), 184 (2000).Google Scholar
Jia, W.J., Zeng, W.D., Zhou, Y.G., Liu, J.R., and Wang, Q.J.: High-temperature deformation behavior of Ti60 titanium alloy. Mater. Sci. Eng., A 528, 4068 (2011).Google Scholar
Lin, Y.C. and Chen, X.M.: A critical review of experimental results and constitutive descriptions for metals and alloys in hot working. Mater. Des. 32(4), 1733 (2011).Google Scholar
Lin, Y.C., Chen, M.S., and Zhang, J.: Modeling of flow stress of 42CrMo steel under hot compression. Mater. Sci. Eng., A 499(1–2), 88 (2009).Google Scholar
Cui, J., Yang, H., Sun, Z., Li, H., Li, Z., and Shen, C.: Flow behavior and constitutive model using piecewise function of strain for TC11 alloy. Rare Met. Mater. Eng. 41(3), 397 (2012).Google Scholar
Lin, J. and Dunne, F.P.E.: Modelling grain growth evolution and necking in superplastic blow-forming. Int. J. Mech. Sci. 43(3), 595 (2001).Google Scholar
Wang, G.C. and Fu, M.W.: Maximum m superplasticity deformation for Ti–6Al–4V titanium alloy. J. Mater. Process. Technol. 192–193, 555 (2007).Google Scholar
Ghosh, A.K.: On the measurement of strain-rate sensitivity for deformation mechanism in conventional and ultra-fine grain alloys. Mater. Sci. Eng., A 463(1–2), 36 (2007).Google Scholar
Hales, R., Holdsworth, S.R., O'Donnell, M.P., Perrin, I.J., and Skelton, R.P.: A code of practice for the determination of cyclic stress-strain data. Mater. High Temp. 19(4), 165 (2002).CrossRefGoogle Scholar
Backfen, W.A., Turner, I.R., and Avery, D.H.: Superplasticity in an Al–Zn alloy. ASM Trans. Q. 57, 980 (1964).Google Scholar
Luo, J., Li, M.Q., Yu, W.X., and Li, H.: The variation of strain rate sensitivity exponent and strain hardening exponent in isothermal compression of Ti–6Al–4V alloy. Mater. Des. 31, 741 (2010).CrossRefGoogle Scholar
Lei, L.M., Huang, X., Wang, M.M., Wang, L.Q., Qin, J.N., and Lu, S.Q.: Effect of temperature on deformation behavior and microstructures of TC11 titanium alloy. Mater. Sci. Eng., A 528(28), 8236 (2011).CrossRefGoogle Scholar
Karpat, Y.: Temperature dependent flow softening of titanium alloy Ti6Al4V: An investigation using finite element simulation of machining. J. Mater. Process. Technol. 211(4), 737 (2011).Google Scholar
Zhao, Y., Guo, H.Z., Shi, Z.F., Yao, Z.K., and Zhang, Y.Q.: Microstructure evolution of TA15 titanium alloy subjected to equal channel angular pressing and subsequent annealing at various temperatures. J. Mater. Process. Technol. 211(8), 1364 (2011).Google Scholar
Gong, X.H., Wang, Y., Xia, Y.M., Ge, P., and Zhao, Y.Q.: Experimental studies on the dynamic tensile behavior of Ti–6Al–2Sn–Zr–3Mo–1Cr–2Nb–Si alloy with Widmanstatten microstructure at elevated temperatures. Mater. Sci. Eng., A 523(1–2), 53 (2009).Google Scholar
Li, L. and Zhou, N.: Experimental investigation of hot deep drawability of EW94 heat resistant alloy sheet. J. Aeronaut. Mater. 33(5), 22 (2013).Google Scholar
Ebrahimi, R. and Pardis, N.: Determination of strain-hardening exponent using double compression test. Mater. Sci. Eng., A 518(1–2), 56 (2009).Google Scholar
Holloman, J.H.: Tensile deformation. Trans. Metall. Soc. AIME 162, 268 (1945).Google Scholar
Stüwe, H.P. and Les, P.: Strain rate sensitivity of flow stress at large strains. Acta Mater. 46(18), 6375 (1998).CrossRefGoogle Scholar
Ma, X., Zeng, W.D., Tian, F., Zhou, Y.G., and Sun, Y.: Optimization of hot process parameters of Ti–6.7Al–2Sn–2.2Zr–2.1Mo–1W–0.2Si alloy with lamellar starting microstructure based on the processing map. Mater. Sci. Eng., A 545, 132 (2012).CrossRefGoogle Scholar