The effects of W, Re, Cr, and Mo on microstructural stability, such as the morphology of γ′ phase and the topologically close-packed (TCP) phase precipitation are systematically investigated in eleven kinds of Ni-based single crystal superalloys containing certain amounts of Co, Al, and Ta. After heat treatment, all the designed alloys show different sizes of γ′ phases with typical cuboidal morphology occupying 75% of the total volume. With increasing Re content, the size of γ′ decreases obviously, while the size of γ′ decreases slightly with increasing Cr and Mo contents. Increasing W does not affect the size of γ′. As a result of thermal exposure at 1000 °C for 1000 h, some acicular, rod-like, and blocky TCP phases are precipitated in most alloys. It is noted that Mo and Re can strongly promote the precipitation of TCP phase, but W has no obvious effect on TCP phase precipitation. In addition, transmission electron microscope analysis indicates that these TCP phases are σ phase, μ phase, and R phase.
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R.C. Reed, T. Tao, and N. Warnken: Alloys-by-design: Application to nickel-based single crystal superalloys. Acta Mater. 57, 5898 (2009).
J.T. Guo: The current situation of application and development of superalloys in the fields of energy industry. Acta Metall. Sin. 46, 513 (2010).
P. Caron: High γ′ solvus new generation nickel-based superalloys for single crystal turbine blade applications. In Superalloys 2000, T.M. Pollock, R.D. Kissinger, R.R. Bowman, K.A. Green, M. Mclean, S. Oison, and J.J. Schirra eds.; TMS: Warrendale, 2000; p. 737.
Z.Q. Hu, L.R. Liu, T. Jin, and X.F. Sun: Development of the Ni-base single crystal superalloys. Aeroengine 31, 1 (2005).
S. Walston, A. Cetel, R. Mackay, K. O’Hara, D. Duhl, and R. Dreshfield: Joint development of a fourth generation single crystal superalloy. In Superalloys 2004, K.A. Green, T.M. Pollock, H. Harada, T.E. Howson, R.C. Reed, J.J. Schirra, and S. Walston eds.; TMS: Warrendale, 2004; p. 1.
A. Sato, A.C. Yeh, T. Kobayashi, T. Yokokawa, H. Harada, T. Murakumo, and J.X. Zhang: Fifth generation Ni based single crystal superalloy with superior elevated temperature properties. Energy Mater. 2, 19 (2007).
C.M.F. Rae and R.C. Reed: The precipitation of topologically close-packed phases in rhenium-containing superalloys. Acta Mater. 49, 4113 (2001).
M.S.A. Karunaratne, C.M.F. Rae, and R.C. Reed: On the microstructural instability of an experimental nickel-based single-crystal superalloy. Metall. Mater. Trans. A 32, 2409 (2001).
M.V. Acharya and G.E. Fuchs: The effect of long-term thermal exposures on the microstructure and properties of CMSX-10 single crystal Ni-base superalloys. Mater. Sci. Eng., A 381, 143 (2004).
O. Lavigne, C. Ramusat, S. Drawin, P. Caron, D. Boivin, and J.L. Pouchou: Relationships between microstructural instabilities and mechanical behaviour in new generation nickel-based single crystal superalloys. In Superalloys 2004, K.A. Green, T.M. Pollock, H. Harada, T.E. Howson, R.C. Reed, J.J. Schirra, and S. Walston eds.; TMS: Warrendale, 2004; p. 667.
W.S. Walston, K.S. O’Hara, E.W. Ross, T.M. Pollock, and W.H. Murphy: René N6: Third generation single crystal superalloy. In Superalloys 1996, R.D. Kissinger, D.J. Deye, D.L. Anton, A.D. Cetel, M.V. Nathal, T.M. Pollock, and D.A. Woodford eds.; TMS: Warrendale, 1996; p. 27.
A. Sato, H. Harada, A.C. Yen, K. Kawagishi, T. Kobayashi, Y. Koizumi, T. Yokokawa, and J.X. Zhang: A 5th generation SC superalloy with balanced high temperature properties and processability. In Superalloys 2008, R.C. Reed, K.A. Green, P. Caron, T.P. Gabb, M.G. Fahrmann, E.S. Huron, and S.A. Woodard eds.; TMS: Warrendale, 2008; p. 131.
R.A. Hobbs, G.J. Brewster, C.M.F. Rae, and S. Tin: Evaluation of ruthenium-bearing single crystal superalloys—A design of experiments. In Superalloys 2008, R.C. Reed, K.A. Green, P. Caron, T.P. Gabb, M.G. Fahrmann, E.S. Huron, and S.A. Woodard eds.; TMS: Warrendale, 2008; p. 171.
P.P. Hu, J.Y. Chen, Q. Fen, Y.H. Chen, L.M. Cao, and X.H. Li: Effects of Mo on microstructure and stress-rupture property of Ni-based single crystal superalloys. Trans. Nonferr. Metal. Soc. 21, 332 (2011).
W.Y. Ma, Y.F. Han, S.S. Li, Y.R. Zheng, and S.K. Gong: Effect of Mo content on the microstructure and stress rupture of a Ni base single crystal superalloy. Acta Metall. Sin. 42, 1191 (2006).
K.Y. Cheng, C.Y. Jo, T. Jin, and Z.Q. Hu: Effect of Re on the precipitation behavior of μ phase in several single crystal superalloys. J. Alloys Compd. 536, 7 (2012).
W.Z. Wang, T. Jin, J.L. Liu, X.F. Sun, H.R. Guan, and Z.Q. Hu: Role of Re and Co on microstructures and γ′ coarsening in single crystal superalloys. Mater. Sci. Eng., A 479, 148 (2008).
S.G. Tian, B.J. Qian, T. Li, L.L. Yu, J. Xie, and M.G. Wang: Evolution and analysis of TCP phase in a single crystal nickel-based superalloy containing Re during aging. Rare Metals 30, 452 (2011).
R.A. Mackay, T.P. Gabb, A. Garg, R.B. Rogers, and M.V. Nathal: Influence of composition on microstructural parameters of single crystal nickel-base superalloys. Mater. Charact. 70, 83 (2012).
L.R. Liu, L.J. Sun, and G.Q. Zu: Effect of mass fraction of Re element on microstructure and properties of single crystal superalloy. J. Shenyang Univ. Technol. 35, 525 (2013).
M.V. Nathal, R.D. Maier, and L.J. Ebert: The influence of cobalt on the microstructure of the nickel-base superalloy MAR-M247. Metall. Trans. A 13, 1775 (1982).
M.V. Nathal and L.J. Ebert: The influence of cobalt, tantalum, and tungsten on the microstructure of single crystal nickel-base superalloys. Metall. Trans. A 16, 1849 (1985).
J.Y. Chen, B. Zhao, Q. Feng, L.M. Cao, and Z.Q. Sun: Effects of Ru and Cr on γ/γ′ microstructural evolution of Ni-based single crystal superalloys during heat treatment. Acta Metall. Sin. 46, 897 (2010).
L.P. Shi, W.B. Wang, Q. Feng, Y.L. Wang, and G.L. Chen: Effects of high Ru and high Cr on the microstructural stability of Ni-base superalloys. J. Univ. Sci. Technol. B. 30, 1362 (2008).
X.P. Tan, J.L. Liu, T. Jin, X.F. Sun, and Z.Q. Hu: Influence of Cr addition on microstructure of a 5% Re-containing single crystal nickel-based superalloy. Trans. Nonferr. Metal. Soc. 21, 1004 (2011).
P. Caron and T. Khan: Evolution of Ni-based superalloys for single crystal gas turbine blade applications. Aerosp. Sci. Technol. 3, 513 (1999).
Y. Koizumi, H. Koguchi, T. Yokokawa, T. Kobayashi, M. Osawa, T. Kimura, and H. Harada: Effect of Ru additions on the TCP-phase formation and creep strength of a Ni-base single crystal superalloy. J. Jpn. Inst. Met. 68, 54 (2004).
X.P. Tan, J.L. Liu, T. Jin, Z.Q. Hu, H.U. Hong, B.G. Choi, I.S. Kim, Y.S. Yoo, and C.Y. Jo: Effect of ruthenium on precipitation behavior of the topologically close-packed phase in a single-crystal Ni-based superalloy during high-temperature exposure. Metall. Mater. Trans. A 43, 3608 (2012).
L.J. Carroll, Q. Feng, J.F. Mansfield, and T.M. Pollock: Elemental partitioning in Ru-containing nickel-base single crystal superalloys. Mater. Sci. Eng., A 457, 292 (2007).
R.C. Reed, D.C. Cox, and C.M.F. Rae: Damage accumulation during creep deformation of a single crystal superalloy at 1150 °C. Mater. Sci. Eng., A 448, 88 (2007).
M.A. Popova, V.P. Kuznetsov, V.P. Lesnikov, N.A. Popov, and I.P. Konakova: The structure and mechanical properties of single-crystal nickel alloys with Re and Ru after high-temperature holds. Mater. Sci. Eng., A 642, 304 (2015).
M.V. Nathal and L.J. Ebert: The influence of cobalt, tantalum, and tungsten on the elevated temperature mechanical properties of single crystal nickel-base superalloys. Metall. Trans. A 16, 1863 (1985).
I.M. Lifshitz and V.V. Slyozov: The kinetics of precipitation from supersaturated solid solutions. J. Phys. Chem. Solids 1–2, 35 (1961).
C. Wagner: Theorie der altering von niederschlägen durch umlösen. Z. Elektrochem. 7–8, 581 (1961).
M.S.A. Karunaratne, D.C. Cox, P. Carter, and R.C. Reed: Modelling of the microsegregation in CMSX-4 superalloy and its homogenization during heat treatment. In Superalloys 2000, T.M. Pollock, R.D. Kissinger, R.R. Bowman, K.A. Green, M. Mclean, S. Oison, and J.J. Schirra eds.; TMS: Warrendale, 2000; p. 263.
G. Liu, L. Liu, S.X. Zhang, C.B. Yang, J. Zhang, and H.Z. Fu: Effect of Re and Ru on microstructure and segregation of Ni-based single crystal superalloys. Acta Metall. Sin. 48, 845 (2012).
S.G. Tian, M.G. Wang, T. Li, B.J. Qian, and J. Xie: Influence of TCP phase and its morphology on creep properties of single crystal nickel-based superalloys. Mater. Sci. Eng., A 527, 5444 (2010).
H.J. Murphy, C.T. Sims, and A.M. Beltran: PHACOMP revisited. J. Metals 11, 47 (1968).
M. Morinaga, N. Yukawa, H. Adachi, and H. Ezaki: New PHACOMP and its applications to alloy design. In Superalloys 1984, TMS: Warrendale, 1984; p. 523.
Z.Q. Chen, Y.F. Han, Z.G. Zhong, P.Y. Wei, and M.G. Yan: New phase stability prediction method of nickel base single crystal superalloys. J. Aeronaut. Mater. 18, 13 (1998).
T. Wen, J.G. Li, L.R. Liu, L.J. Chen, and T. Jin: Effect of long-term aging on microstructure evolution and stress rupture properties of Ni-based single crystal superalloy. Rare Met. Mater. Eng. 41, 230 (2012).
X.Z. Qin, J.T. Guo, C. Yuan, G.X. Yang, L.Z. Zhou, and H.Q. Ye: μ-Phase behavior in a cast Ni- base superalloy. J. Mater. Sci. 44, 4840 (2009).
This work was supported by the National High Technology Research and Development Program of China (2012AA03A511), National Natural Science Foundation of China (51472200, 51272211, 51002122, 51331005), Research Fund of the State Key Laboratory of Solidification Processing in NWPU (93-QZ-2014, 132-QP-2015), Project of Shaanxi Provincial Youth Science and Technology Star Plan (2015KJXX-08), and Fundamental Research Funds for the Central Universities (G2015KY0002).
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Wang, B., Zhang, J., Huang, T. et al. Influence of W, Re, Cr, and Mo on microstructural stability of the third generation Ni-based single crystal superalloys. Journal of Materials Research 31, 3381–3389 (2016). https://doi.org/10.1557/jmr.2016.355