Effect of Strain on Recrystallization of a Ni-Based Single Crystal Superalloy

Conference paper

Abstract

The effect of strain induced by compression testing on recrystallization (RX) of a single crystal superalloy DD6 was investigated. The evolution of surface structure during annealing at the temperatures of 1000, 1100, 1220 °C was characterized by Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS). The element distribution and microstructure of the oxidation layer after annealing at 1100 °C showed that the main chemical elements were mainly Al, Ta, Cr, Ni, O. This indicated that the formation process of oxides included the inward diffusion of O and the outward diffusion of oxide-rich elements (Al, Cr, etc.). The thickness of RX layer was measured. At 1000 °C, no recrystallization but PFZ (precipitate free zone) was observed under oxidation layer. However, when annealing at higher temperature, the thickness of RX layer increased obviously with the increasing deformation strain. Cellular recrystallization could be detected in the samples annealed at 1100 °C, whereas isometric recrystallization and annealing twin formed in the specimen annealed at 1220 °C.

Keywords

Ni-based superalloy Strain Recrystallization Annealing 

References

  1. 1.
    R. Burgel, P.D. Portella, J. Preuhs, et al. Recrystallization in single crystals of nickel base superalloys, J. Superalloys, (2000) 229–238.Google Scholar
  2. 2.
    C.H. Tao. Recrystallization of directionally solidified superalloy, second ed., National defense industry press, Beijing, 2014.Google Scholar
  3. 3.
    S.D. Bond, J.W. Martin. Surface recrystallization in a single crystal nickel-based superalloy, J. J Mater Sci., 19(12) (1984) 3867–3872.Google Scholar
  4. 4.
    Z.X. Shi, L.J. Li, S.Z. Liu. Isothermal oxidation behavior of single crystal superalloy DD6, J. Trans. Nonferrous Met. Soc. China, 22(3) (2012) 534–538.Google Scholar
  5. 5.
    H. Pei, Z. Wen, Y. Zhang, et al. Oxidation behavior and mechanism of a ni-based single crystal superalloy with single α-Al2O3 film at 1000 °C, J. Appl. Surf. Sci., (2017) 124–135.Google Scholar
  6. 6.
    K. Kawagishi, H. Harada, A. Sato, et al. The oxidation properties of fourth generation single-crystal nickel-based superalloys, J. JOM, 58(1) (2006) 43–46.Google Scholar
  7. 7.
    G. Xie, J. Zhang, L.H. Lou. Effect of heat treatment atmosphere on surface recrystallization of a directionally solidified ni-base superalloy, J. Scripta Mater, 59(8) (2008) 858–861.Google Scholar
  8. 8.
    H. Pei, Z. Wen, Z. Yue. Long-term oxidation behavior and mechanism of DD6 ni-based single crystal superalloy at 1050 °C and 1100 °C in air, J. Journal of Alloys & Compounds, 704 (2017) 218–226.Google Scholar
  9. 9.
    S. Xiang, S. Mao, H. Wei, et al. Selective evolution of secondary γ′ precipitation in a ni-based single crystal superalloy both in the γ matrix and at the dislocation nodes, J. Acta. Mater, 116 (2016) 343–353.Google Scholar
  10. 10.
    W.D. Callister. Fundamentals of materials science and engineering: An interactive e. Text, J. Wiley John & Sons, 34(6) (2001) 824.Google Scholar
  11. 11.
    L.R. Liu, Z.J. Peng, et al. Study on nucleation site and mechanism of recrystallization behavior for DD6 Nickel-base single crystal superalloy, Foundry, 63(11) (2014) 1142–1145 (in Chinese).Google Scholar
  12. 12.
    L.R. Liu, G.Q. Zu, et al. Mechanism of nucleation and growth of recrystallization in single crystal superalloy, T. Mater. Heat Treat., 34(6) (2013) 38–41 (in Chinese).Google Scholar
  13. 13.
    B. Zhang, X.-G. Cao, D.-L. Liu, et al. Surface recrystallization of single crystal nickel-based superalloy, J. T. Nonferr. Metal Soc., 23(5) (2013) 1286–1292.Google Scholar
  14. 14.
    H.N. Mathur, C. Panwisawas, C.N. Jones, et al. Nucleation of recrystallization in castings of single crystal ni-based superalloys, J. Acta Mater, 129 (2017) 112–123.Google Scholar
  15. 15.
    H. Gleiter. The formation of annealing twins, J. Acta Metallurgica, 17(12) (1969) 1421–1428.Google Scholar
  16. 16.
    C. Academic Committee of the Superalloys. China superalloys handbook, Beijing, 2012 (in Chinese).Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.School of Energy and Power EngineeringBeihang UniversityBeijingChina
  2. 2.Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and EngineeringBeihang UniversityBeijingChina

Personalised recommendations