Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-10T13:41:56.020Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Co on microstructural stability of the third generation Ni-based single crystal superalloys

Published online by Cambridge University Press:  28 March 2016

Bo Wang ,
Jun Zhang ,
Taiwen Huang ,
Wenchao Yang Open the ORCID record for Wenchao Yang [Opens in a new window] ,
Haijun Su ,
Zhuoran Li ,
Lin Liu  and
Hengzhi Fu
Bo Wang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Jun Zhang*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Taiwen Huang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Wenchao Yang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Haijun Su
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Zhuoran Li
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Lin Liu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Hengzhi Fu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
*
a) Address all correspondence to this author. e-mail: zhjscott@nwpu.edu.cn
Get access

Abstract

The effect of Co on element segregation and microstructure is investigated in the third generation Ni-based single crystal superalloys with 4, 8.5, and 11.5 wt% Co addition. The results show that the increase of Co content leads to a severe element segregation in as-cast microstructure. After heat treatment, the size of γ′ phase is slightly reduced with Co content increase. During the thermal exposure, the γ′ phase coarsens gradually but its coarsening rate decreases with increasing Co content. In addition, some acicular and blocky topologically close-packed (TCP) phases are precipitated in 4% Co and 8.5% Co alloys. However, no TCP phase can be found in 11.5% Co alloy. Finally, it may be concluded that although a higher Co content is harmful for the element segregation, it is beneficial to maintain the cuboidal morphology of γ′ phase, decrease its coarsening rate, and impede the precipitation of TCP phase.

Keywords

ComicrostructureNi
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1328 - 1337
Copyright
Copyright © Materials Research Society 2016 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Hu, Z., Liu, L., Jin, T., and Sun, X.: Development of the Ni-base single crystal superalloys. Aeroengine 3, 1 (2005).Google Scholar
Guo, J.: The current situation of application and development of superalloys in the fields of energy industry. Acta Metall. Sin. 5, 513 (2010).Google Scholar
Reed, R.C., Tao, T., and Warnken, N.: Alloys-by-design: Application to nickel-based single crystal superalloys. Acta Mater. 57, 5898 (2009).CrossRefGoogle Scholar
Walston, S., Cetel, A., Mackay, R., O'Hara, K., Duhl, D., and Dreshfield, R.: Joint development of a fourth generation single crystal superalloy. In Superalloys 2004, Green, K.A., Pollock, T.M., Harada, H., Howson, T.E., Reed, R.C., Schirra, J.J., and Walston, S., eds. (TMS: Warrendale, 2004); p. 1.Google Scholar
Caron, P.: High γ′ solvus new generation nickel-based superalloys for single crystal turbine blade applications. In Superalloys 2000, Pollock, T.M., Kissinger, R.D., Bowman, R.R., Green, K.A., Mclean, M., Oison, S., and Schirra, J.J., eds. (TMS: Warrendale, 2000); p. 737.Google Scholar
Sato, A., Harada, H., Yen, A.C., Kawagishi, K., Kobayashi, T., Koizumi, Y., Yokokawa, T., and Zhang, J.X.: A 5th generation sc superalloy with balanced high temperature properties and processability. In Superalloys 2008, Reed, R.C., Green, K.A., Caron, P., Gabb, T.P., Fahrmann, M.G., Huron, E.S., and Woodard, S.A., eds. (TMS: Warrendale, 2008); p. 131.Google Scholar
Sato, A., Yeh, A.C., Kobayashi, T., Yokokawa, T., Harada, H., Murakumo, T., and Zhang, J.X.: Fifth generation Ni based single crystal superalloy with superior elevated temperature properties. Energy Mater. 1, 19 (2007).CrossRefGoogle Scholar
Fuchs, G.E.: Solution heat treatment response of a third generation single crystal Ni-base superalloy. Mater. Sci. Eng., A 300, 52 (2001).Google Scholar
Rae, C.M.F. and Reed, R.C.: The precipitation of topologically close-packed phases in rhenium-containing superalloys. Acta Mater. 49, 4113 (2001).CrossRefGoogle Scholar
Rettig, R. and Singer, R.F.: Numerical modelling of precipitation of topologically close-packed phases in nickel-base superalloys. Acta Mater. 59, 317 (2011).Google Scholar
Lavigne, O., Ramusat, C., Drawin, S., Caron, P., Boivin, D., and Pouchou, J.L.: Relationships between microstructural instabilities and mechanical behaviour in new generation nickel-based single crystal superalloys. In Superalloys 2004, Green, K.A., Pollock, T.M., Harada, H., Howson, T.E., Reed, R.C., Schirra, J.J., and Walston, S., eds. (TMS: Warrendale, 2004); p. 667.Google Scholar
Walston, W.S., O'Hara, K.S., Ross, E.W., Pollock, T.M., and Murphy, W.H.: René N6: third generation single crystal superalloy. In Superalloys 1996, Kissinger, R.D., Deye, D.J., Anton, D.L., Cetel, A.D., Nathal, M.V., Pollock, T.M., and Woodford, D.A., eds. (TMS: Warrendale, 1996); p. 27.Google Scholar
Acharya, M.V. and Fuchs, G.E.: 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).CrossRefGoogle Scholar
Tan, X., Liu, J., Jin, T., Hu, Z., Hong, H.U., Choi, B.G., Kim, I.S., Yoo, Y.S., and Jo, C.Y.: 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).CrossRefGoogle Scholar
Karunaratne, M.S.A., Rae, C.M.F., and Reed, R.C.: On the microstructural instability of an experimental nickel-based single-crystal superalloy. Metall. Mater. Trans. A 32, 2409 (2001).Google Scholar
Wang, W., Jin, T., Liu, J., Sun, X., Guan, H., and Hu, Z.: Role of Re and Co on microstructures and γ′ coarsening in single crystal superalloys. Mater. Sci. Eng., A 479, 148 (2008).CrossRefGoogle Scholar
Erickson, G.L.: The development of the CMSX-1lB and CMSX-1lC alloys for industrial gas turbine application. In Superalloys 1996, Kissinger, R.D., Deye, D.J., Anton, D.L., Cetel, A.D., Nathal, M.V., Pollock, T.M., and Woodford, D.A., eds. (TMS: Warrendale, 1996); p. 45.Google Scholar
Erickson, G.L.: The development and application of CMSX-10. In Superalloys 1996, TMS: Warrendale, 1996); p. 35.Google Scholar
Nathal, M.V., Maier, R.D., and Ebert, L.J.: The influence of cobalt on the microstructure of the nickel-base superalloy MAR-M247. Metall. Trans. A 13, 1775 (1982).Google Scholar
Nathal, M.V. and Ebert, L.J.: The influence of cobalt, tantalum, and tungsten on the microstructure of single crystal nickel-base superalloys. Metall. Trans. A 16, 1849 (1985).Google Scholar
Nathal, M.V. and Ebert, L.J.: 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).Google Scholar
Lifshitz, I.M. and Slyozov, V.V.: The kinetics of precipitation from supersaturated solid solutions. J. Phys. Chem. Solids 1–2, 35 (1961).Google Scholar
Wagner, C.: Theorie der alterung von niederschlägen durch umlösen. Z. Elektrochem. 7–8, 581 (1961).Google Scholar
Vandermolen, E.H., Oblak, J.M., and Kriege, O.H.: Control of γ′ particle size and volume fraction in the high temperature superalloy Udimet 700. Metall. Trans. 2, 1627 (1971).Google Scholar
Giamei, A.F. and Aanton, D.L.: Rhenium additions to a Ni-base superalloy: Effects on microstructure. Metall. Trans. 16, 1997 (1985).CrossRefGoogle Scholar
Sun, W.: Kinetics for coarsening co-controlled by diffusion and a reversible interface reaction. Acta Mater. 55, 313 (2007).Google Scholar
Chen, Z., Han, Y., Zhong, Z., Wei, P., and Yan, M.: New phase stability prediction method of nickel base single crystal superalloys. J. Aeronaut. Mater. 4, 13 (1998).Google Scholar
Jiao, S., Zhang, J., Jin, T., Wang, C., Wang, H., Liu, L., and Fu, H.: DTA research of a third generation Ni-based single crystal superalloy. Rare Met. Mater. Eng. 5, 1028 (2013).Google Scholar
Fährmann, M., Fratzl, P., Paris, O., Fährmann, E., and Johnson, W.C.: Influence of coherency stress on microstructural evolution in model Ni–Al–Mo alloys. Acta Metall. Mater. 3, 1007 (1995).CrossRefGoogle Scholar
Wang, T., Sheng, G., Liu, Z., and Chen, L.: Coarsening kinetics of γ′ precipitates in the Ni–Al–Mo system. Acta Mater. 56, 5544 (2008).Google Scholar
Qin, X., Guo, J., Yuan, C., Yang, G., Zhou, L., and Ye, H.: μ-Phase behavior in a cast Ni-base superalloy. J. Mater. Sci. 44, 4840 (2009).CrossRefGoogle Scholar
Wen, T., Li, J., Liu, L., Chen, L., and Jin, T.: Effect of long-term aging on microstructure evolution and stress rupture properties of Ni-based single crystal superalloy. Rare Met. Mater. Eng. 2, 230 (2012).Google Scholar