Abstract
The change rules associated with hot deformation of FGH96 alloy were investigated by isothermal two-pass hot deformation tests in the temperature range 1050–1125°C and at strain rates ranging from 0.001 to 0.1 s−1 on a Gleeble 3500 thermo-simulation machine. The results showed that the softening degree of the alloy between passes decreases with increasing temperature and decreasing strain rates. The critical strain of the first-pass is greater than that of the second-pass. The true stress-true strain curves showed that single-peak dynamic recrystallization, multi- peak dynamic recrystallization, and dynamic response occur when the strain rate is 0.1, 0.01, and 0.001 s−1, respectively. The alloy contains three different grain structures after hot deformation: partially recrystallized tissue, completely fine recrystallized tissue, coarse-grained grains. The small-angle grain boundaries increase with increasing temperature. Increasing strain rates cause the small-angle grain boundaries to first increase and then decrease.
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References
S.L. Semiatin, J.M. Shank, A.R. Shiveley, W.M. Saurber, E.F. Gaussa, and A.L. Pilchak, The effect of forging variables on the supersolvus heat-treatment response of powder-metallurgy nickel-base superalloys, Metall. Mater. Trans. A., 45(2014), No. 13, p. 6231.
J. Li and H.M. Wang, Microstructure and mechanical properties of rapid directionally solidified Ni-base superalloy Rene41 by laser melting deposition manufacturing, Mater. Sci. Eng. A, 527(2010), No. 18–19, p. 4823.
M.J. Zhang, F.G. Li, S.Y. Wang, and C.Y. Liu, Effect of powder preparation technology on the hot deformation behavior of HIPed P/M Nickel-base superalloy FGH96, Mater. Sci. Eng. A, 528(2011), No. 12, p. 4030.
M.J. Zhang, F.G. Li, Z.W. Yuan, J. Li, and S.Y. Wang, Effect of heat treatment on the micro-indentation behavior of powder metallurgy nickel based superalloy FGH96, Mater. Des., 49(2013), p. 705.
C.Z. Liu, F. Liu, H. Lan, and L. Jiang, Effect of hot extrusion and heat treatment on microstructure of nickel-base superalloy, Trans. Nonferrous Met. Soc. China, 24(2014), No. 8, p. 2544.
X.H. Xie, Z.K. Yao, Y.Q. Ning, H.Z. Guo, Y. Tao, and Y.W. Zhang, Dynamic recrystallization and grain refining of superalloy FGH4096, J. Aeronaut. Mater., 31(2011), No. 1, p. 20.
Z.H. Yao, J.X. Dong, and M.C. Zhang, Microstructure control and prediction of GH738 superalloy during hot deformation I. Construction of microstructure evolution model, Acta Metall. Sin., 47(2011), p. 1581.
P.F. Liu, D. Liu, Z.J. Luo, W.R. Sun, S.R. Guo, and Z.Q. Hu, Flow behavior and dynamic recrystallization model for GH761 superalloy during hot deformation, Rare Met. Mater. Eng., 38(2009), No. 2, p. 275.
Z.G. Wu, D.F. Li, S.L. Guo, Q.M. Guo, and H.J. Peng, Dynamic recrystallization models of GH625 Ni-based superalloy, Rare. Met. Mater. Eng., 41(2012), p. 235.
B. Fang, Z. Ji, M. Liu, G.F. Tian, C.C. Jia, T.T. Zeng, B.F. Hu, and Y.H. Chang, Critical strain and models of dynamic recrystallization for FGH96 superalloy during two-pass hot deformation, Mater. Sci. Eng. A, 593(2014), p. 8.
B. Fang, Z. Ji, M. Liu, G.F. Tian, C.C. Jia, T.T. Zeng, B.F. Hu, and C.C. Wang, Study on constitutive relationships and processing maps for FGH96 alloy during two-pass hot deformation, Mater. Sci. Eng. A, 590(2014), p. 255.
B. Fang, Z. Ji, G.F. Tian, C.C. Jia, B.F. Hu, and Z.W. Cui, Flow behavior and processing map of FGH96 superalloy during two-pass hot deformation, Chin. J. Eng., 37(2015), No. 3, p. 336.
D.G. He, Y.C. Lin, M.S. Chen, and L. Ling, Kinetics equations and microstructural evolution during metadynamic recrystallization in a nickel-based superalloy with δ phase, J. Alloys Compd., 690(2017), p. 971.
Y.C. Lin, Y.X. Liu, M.S. Chen, M.H. Huang, X. Ma, and Z.L. Long, Study of static recrystallization behavior in hot deformed Ni-based superalloy using cellular automaton model, Mater. Des., 99(2016), p. 107.
D.G. He, Y.C. Lin, J. Chen, D.D. Chen, J. Huang, Y. Tang, and M.S. Chen, Microstructural evolution and support vector regression model for an aged Ni-based superalloy during two-stage hot forming with stepped strain rates, Mater. Des., 154(2018), p. 51.
Y.C. Lin, F. Wu, Q.W. Wang, D.D. Chen, and S.K. Singh, Microstructural evolution of a Ni-Fe-Cr-base superalloy during non-isothermal two-stage hot deformation, Vacuum., 151(2018), p. 283.
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Financial support from the National Natural Science Foundation of China (No. 51471023) and the Ministry of Science and Technology of the People’s Republic of China (National 973 Program, No. 2014GB120000) are gratefully acknowledged.
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Fang, B., Tian, Gf., Ji, Z. et al. Study on the thermal deformation behavior and microstructure of FGH96 heat extrusion alloy during two-pass hot deformation. Int J Miner Metall Mater 26, 657–663 (2019). https://doi.org/10.1007/s12613-019-1774-0
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DOI: https://doi.org/10.1007/s12613-019-1774-0