Advertisement

Strain Rate Sensitivity of GH4720LI Alloy with Two Initial Microstructures During Hot Deformation

  • Zhi-Peng WanEmail author
  • Tao Wang
  • Yu Sun
  • Lian-Xi Hu
  • Zhao Li
  • Peihuan Li
  • Yong Zhang
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 217)

Abstract

In this study, the effects of initial microstructure on the flow stress, strain rate sensitivity (m), and microstructure during hot deformation of GH4720LI alloy with different initial microstructures were studied using hot compression tests over a wide temperatures range of 1080–1180 °C and strain rates (0.001–10 s−1) to a final true strain of 0.8. The results showed that flow stress and deformation mechanisms of the alloys were significantly affected by the γ′ precipitates. The flow stresses of the two initial microstructures (i.e., microstructures AC and AF) presented typical DRX softening behavior and exhibited nearly a consistent variation trend which was decreased with the increase of temperature. The peak stresses in the microstructure of as-forged samples with smaller initial grain size were lower than microstructure AC when deformation temperature was lower than 1160 °C. While the gap between the two sets of specimens gradually decreased over a temperature of 1160 °C, which was mainly attributed to dissolution of the γ′ precipitates in alloys. According to the analysis of the strain rate sensitivity values distribution maps with two initial microstructures, the deformation mechanisms of the alloys in various deformation conditions were discussed in detail. Dislocation glide/climb was identified as the dominant deformation mechanism at low temperature, while grain boundary sliding and accommodation was confirmed as the main deformation mechanism at high temperature 1180 °C and low strain rate.

Keywords

Initial microstructure Hot compression test γ′ precipitates Strain rate sensitivity Deformation mechanism 

Notes

Acknowledgements

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

References

  1. 1.
    K. Gopinath, A.K. Gogia, S.V. Kamat et al., Dynamic strain ageing in Ni-base superalloy 720Li. Acta Mater. 57(4), 1243–1253 (2009)CrossRefGoogle Scholar
  2. 2.
    M.P. Jackson, R.C. Reed, Heat treatment of UDIMET 720Li: the effect of microstructure on properties. Mater. Sci. Eng., A 259(1), 85–97 (1999)CrossRefGoogle Scholar
  3. 3.
    Y.S. Na, N.K. Park, R.C. Reed, Sigma morphology and precipitation mechanism in UDIMET 720Li. Scripta Mater. 43(7), 585–590 (2000)CrossRefGoogle Scholar
  4. 4.
    H.M. Wang, P.D. Wu, S. Kurukuri et al., Strain rate sensitivities of deformation mechanisms in magnesium alloys. Int. J. Plast. 107, 207–222 (2018)CrossRefGoogle Scholar
  5. 5.
    R. Radis, M. Schaffer, M. Albu et al., Multimodal size distributions of γ′ precipitates during continuous cooling of UDIMET 720Li. Acta Mater. 57(19), 5739–5747 (2009)CrossRefGoogle Scholar
  6. 6.
    Z.P. Wan, L.X. Hu, Y. Sun et al., Microstructure evolution and dynamic softening mechanisms during high-temperature deformation of a precipitate hardening Ni-based superalloy. Vacuum 155, 585–593 (2018)CrossRefGoogle Scholar
  7. 7.
    Y. Nan, Y.Q. Ning, H.Q. Liang et al., Work-hardening effect and strain-rate sensitivity behavior during hot deformation of Ti–5Al–5Mo–5V–1Cr–1Fe alloy. Mater. Des. 82, 84–90 (2015)CrossRefGoogle Scholar
  8. 8.
    P. Lin, Y.G. Hao, B.Y. Zhang et al., Strain rate sensitivity of Ti–22Al–25Nb (at%) alloy during high temperature deformation. Mater. Sci. Eng., A 710, 336–342 (2018)CrossRefGoogle Scholar
  9. 9.
    A. Bintu, G. Vincze, C.R. Picu et al., Strain hardening rate sensitivity and strain rate sensitivity in TWIP steels. Mater. Sci. Eng., A 629, 54–59 (2015)CrossRefGoogle Scholar
  10. 10.
    Q. Zuo, F. Liu, L. Wang et al., Prediction of hot deformation behavior in Ni-based alloy considering the effect of initial microstructure. Prog. Nat. Sci.: Mater. Int. 25(1), 66–77 (2015)CrossRefGoogle Scholar
  11. 11.
    P. Gao, M. Zhan, X. Fan et al., Hot deformation behavior and microstructure evolution of TA15 titanium alloy with nonuniform microstructure. Mater. Sci. Eng., A 689, 243–251 (2017)CrossRefGoogle Scholar
  12. 12.
    F.F. Liu, J.Y. Chen, J.X. Dong et al., The hot deformation behaviors of coarse, fine and mixed grain for UDIMET 720Li superalloy. Mater. Sci. Eng., A 651, 102–115 (2016)CrossRefGoogle Scholar
  13. 13.
    L. Li, M.Q. Li, J. Luo, Flow softening mechanism of Ti–5Al–2Sn–2Zr–4Mo–4Cr with different initial microstructures at elevated temperature deformation. Mater. Sci. Eng., A 628, 11–20 (2015)CrossRefGoogle Scholar
  14. 14.
    Z.X. Zhang, S.J. Qu, A.H. Feng et al., Hot deformation behavior of Ti–6Al–4V alloy: effect of initial microstructure. J. Alloy. Compd. 718, 170–181 (2017)CrossRefGoogle Scholar
  15. 15.
    Z.H. Jiang, P. Wang, D.Z. Li et al., The evolutions of microstructure and mechanical properties of 2.25Cr–1Mo–0.25V steel with different initial microstructures during tempering. Mater. Sci. Eng., A 699, 165–175 (2017)CrossRefGoogle Scholar
  16. 16.
    F. Pilehva, A. Zarei-Hanzaki, S.M. Fatemi-Varzaneh, The influence of initial microstructure and temperature on the deformation behavior of AZ91 magnesium alloy. Mater. Des. 42, 411–417 (2012)CrossRefGoogle Scholar
  17. 17.
    F.L. Li, R. Fu, F.J. Yin et al., Impact of γ′(Ni3(Al, Ti)) phase on dynamic recrystallization of a Ni-based disk superalloy during isothermal compression. J. Alloy. Compd. 693, 1076–1082 (2017)CrossRefGoogle Scholar
  18. 18.
    I.J. Moore, J.I. Taylor, M.W. Tracy et al., Grain coarsening behaviour of solution annealed Alloy 625 between 600–800 °C. Mater. Sci. Eng., A 682, 402–409 (2017)CrossRefGoogle Scholar
  19. 19.
    P. Zhang, Y. Yuan, J. Li et al., Tensile deformation mechanisms in a new directionally solidified Ni-base superalloy containing coarse γ′ precipitates at 650 °C. Mater. Sci. Eng., A 702, 343–349 (2017)CrossRefGoogle Scholar
  20. 20.
    J.X. Dong, L.H. Li, H.N. Li et al., Effect of extent of homogenization on the hot deformation recrystallization of superalloy ingot in cogging process. Acta Metall. Sin. 51(10), 1207–1218 (2015)Google Scholar
  21. 21.
    A. Belyakov, H. Miura, T. Sakai, Dynamic recrystallization in ultra fine-grained 304 stainless steel. Scripta Mater. 43(1), 21–26 (2000)CrossRefGoogle Scholar
  22. 22.
    M. El Wahabi, L. Gavard, F. Montheillet et al., Effect of initial grain size on dynamic recrystallization in high purity austenitic stainless steels. Acta Mater. 53(17), 4605–4612 (2005)CrossRefGoogle Scholar
  23. 23.
    W.Z. Wang, H.U. Hong, I.S. Kim et al., Influence of γ′ and grain boundary carbide on tensile fracture behaviors of Nimonic 263. Mater. Sci. Eng., A 523(1), 242–245 (2009)CrossRefGoogle Scholar
  24. 24.
    C. Joseph, C. Persson, M. Hörnqvist Colliander, Influence of heat treatment on the microstructure and tensile properties of Ni-base superalloy Haynes 282. Mater. Sci. Eng., A 679, 520–530 (2017)CrossRefGoogle Scholar
  25. 25.
    L.W. Yang, C.Y. Wang, M.A. Monclús et al., Influence of temperature on the strain rate sensitivity and deformation mechanisms of nanotwinned Cu. Scripta Mater. 154, 54–59 (2018)CrossRefGoogle Scholar
  26. 26.
    K. Li, V.S.Y. Injeti, R.D.K. Misra et al., On the strain rate sensitivity of aluminum-containing transformation-induced plasticity steels: Interplay between TRIP and TWIP effects. Mater. Sci. Eng., A 711, 515–523 (2018)CrossRefGoogle Scholar
  27. 27.
    J. Gao, M.Q. Li, G.J. Liu et al., Deformation behavior and processing maps during isothermal compression of TC21 alloy. Rare Met. 36(2), 86–94 (2017)CrossRefGoogle Scholar
  28. 28.
    F.L. Li, R. Fu, D. Feng et al., Hot workability characteristics of Rene88DT superalloy with directionally solidified microstructure. Rare Met. 34(1), 51–63 (2015)CrossRefGoogle Scholar
  29. 29.
    F.C. Liu, T.W. Nelson, Grain structure evolution, grain boundary sliding and material flow resistance in friction welding of Alloy 718. Mater. Sci. Eng., A 710, 280–288 (2018)CrossRefGoogle Scholar
  30. 30.
    D. Peter, G.B. Viswanathan, M.F.X. Wagner et al., Grain-boundary sliding in a TiAl alloy with fine-grained duplex microstructure during 750 °C creep. Mater. Sci. Eng., A 510–511, 359–363 (2009)CrossRefGoogle Scholar
  31. 31.
    M.A. Meyers, K.K. Chawla, Mechanical Behavior of Materials (Cambridge University Press, New York, 2009)Google Scholar
  32. 32.
    E.V. Boltynjuk, D.V. Gunderov, E.V. Ubyivovk et al., Enhanced strain rate sensitivity of Zr-based bulk metallic glasses subjected to high pressure torsion. J. Alloy. Compd. 747, 595–602 (2018)CrossRefGoogle Scholar
  33. 33.
    W.J. Kim, J. Wolfenstine, O.D. Sherby, Tensile ductility of superplastic ceramics and metallic alloys. Acta Metall. Mater. 39(2), 199–208 (1991)CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Science and Technology on Advanced High Temperature Structural Materials LaboratoryAEEC Beijing Institute of Aeronautical MaterialsBeijingChina
  2. 2.National Key Laboratory for Precision Hot Processing of MetalsHarbin Institute of TechnologyHarbinChina

Personalised recommendations