Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-27T22:12:31.306Z Has data issue: false hasContentIssue false
  • English
  • Français

High temperature properties and fatigue strength of novel wrought γ/γ′ Co-base superalloys

Published online by Cambridge University Press:  22 August 2017

Lisa Patricia Freund Open the ORCID record for Lisa Patricia Freund [Opens in a new window] ,
Sven Giese ,
Daniel Schwimmer ,
Heinz Werner Höppel ,
Steffen Neumeier  and
Mathias Göken
Lisa Patricia Freund*
Affiliation:
Department of Materials Science and Engineering, Friedrich-Alexander Universität Erlangen-Nürnberg, Institute I, Erlangen 91058, Germany
Sven Giese
Affiliation:
Department of Materials Science and Engineering, Friedrich-Alexander Universität Erlangen-Nürnberg, Institute I, Erlangen 91058, Germany
Daniel Schwimmer
Affiliation:
Department of Materials Science and Engineering, Friedrich-Alexander Universität Erlangen-Nürnberg, Institute I, Erlangen 91058, Germany
Heinz Werner Höppel
Affiliation:
Department of Materials Science and Engineering, Friedrich-Alexander Universität Erlangen-Nürnberg, Institute I, Erlangen 91058, Germany
Steffen Neumeier
Affiliation:
Department of Materials Science and Engineering, Friedrich-Alexander Universität Erlangen-Nürnberg, Institute I, Erlangen 91058, Germany
Mathias Göken
Affiliation:
Department of Materials Science and Engineering, Friedrich-Alexander Universität Erlangen-Nürnberg, Institute I, Erlangen 91058, Germany
*
a)Address all correspondence to this author. e-mail: lisa.freund@fau.de
Get access

Abstract

This paper presents the high temperature yield and fatigue strength as well as thermophysical properties of two polycrystalline wrought γ/γ′ Co-base superalloys developed for application in a temperature regime above 700 °C. The alloys CoWAlloy1 (Co42Ni32Cr12Al6W3Ti2.5Ta1.5 + Si,C,B,Zr,Hf) and CoWAlloy2 (Co41Ni32Cr12Al9W5 + Ti,Ta,Si,C,B,Zr,Hf) exhibited solidus temperatures of 1070 °C and 1030 °C, respectively, and a γ′ fraction of about 50%. CoWAlloy2 displayed a rather high Young’s modulus of 250 GPa. The two Co-base superalloys showed a good high temperature strength exceeding Ni-base disc alloys U720Li and Waspaloy at temperatures above 800 °C. When comparing the yield strength from tensile and compression tests, no asymmetry could be found. The low-cycle fatigue life of CoWAlloy2 at a total strain amplitude of 0.5% is similar to that of U720Li and Waspaloy (about 370 cycles, R = −1). During long-term aging for 1024 h at 750 °C, no additional phases were formed and the room temperature hardness barely changed.

Keywords

Cofatiguestrength
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 24: Focus Issue: Mechanical Properties and Microstructure of Advanced Metallic Alloys—in Honor of Prof. Haël Mughrabi PART B , 28 December 2017 , pp. 4475 - 4482
Check for updates
Copyright
Copyright © Materials Research Society 2017 

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.)

Footnotes

b)

This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

Contributing Editor: Yuntian Zhu

References

REFERENCES

Hardy, M.C., Zirbel, B., Shen, G., and Shankar, R.: Developing damage tolerance and creep resistance in a high strength nickel alloy for disc applications. In Proceedings 10th International Symposium on Superalloys, Green, K.A., Pollock, T.M., Harada, H., Howson, T.E., Reed, R.C., Schirra, J.J., and Walston, S., eds. (The Minerals, Metals and Materials Society, Warrendale, 2004); pp. 83–90.Google Scholar
Gabb, T.P., Garg, A., Ellis, D.L., and O’Connor, K.M.: Detailed Microstructural Characterization of the Disk Alloy ME3 (NASA Glenn Research Center, Cleveland, Ohio, 2004). NASA/TM-2004–74383.Google Scholar
Bauer, A., Neumeier, S., Pyczak, F., and Göken, M.: Creep strength and microstructure of polycrystalline g'-strengthened cobalt-base superalloys. In Proceedings 12th International Symposium on Superalloys, Huron, E.S., Reed, R.C., Hardy, M.C., Mills, M.J., Montero, R.E., Portella, P.D., and Telesman, J., eds. (The Minerals, Metals and Materials Society, Warrendale, 2012); pp. 695–703.Google Scholar
Neumeier, S., Freund, L.P., and Göken, M.: Novel wrought γ/γ′ cobalt base superalloys with high strength and improved oxidation resistance. Scr. Mater. 109, 104 (2015).CrossRefGoogle Scholar
Fahrmann, M., Hermann, W., Fahrmann, E., Boegli, A., Pollock, T.M., and Sockel, H.G.: Determination of matrix and precipitate elastic constants in (γ–γ′) Ni-base model alloys, and their relevance to rafting. Mater. Sci. Eng., A 260, 212 (1999).Google Scholar
Bryant, D.J. and McIntosh, G.: The manufacture and evaluation of a large lurbine disc in cast and wrought alloy 720Li. In Proceedings 8th International Symposium on Superalloys, Kissinger, R.D., Deye, D.J., Anton, D.L., Cetel, A.D., Nathal, M.V., Pollock, T.M., and Woodford, D.A., eds. (The Minerals, Metals and Materials Society, Warrendale, 1996); pp. 713–722.Google Scholar
Bauer, A.: Hochtemperatureigenschaften Polykristalliner γ′-Gehärteter Kobaltbasis-Superlegierungen (Friedrich-Alexander Universität, Erlangen-Nürnberg, 2015).Google Scholar
Yao, Q., Xing, H., and Sun, J.: Structural stability and elastic property of the L12 ordered Co3(Al,W) precipitate. Appl. Phys. Lett. 89(16), 161906 (2006).Google Scholar
Ooshima, M., Tanaka, K., Okamoto, N.L., Kishida, K., and Inui, H.: Effects of quaternary alloying elements on the γ′ solvus temperature of Co–Al–W based alloys with fcc/L12 two-phase microstructures. J. Alloys Compd. 508(1), 71 (2010).Google Scholar
Furrer, D.U. and Fecht, H-J.: γ′ formation in superalloy U720LI. Scr. Mater. 40(11), 1215 (1999).Google Scholar
Penkalla, H., Wosik, J., and Czyrska-Filemonowicz, A.: Quantitative microstructural characterisation of Ni-base superalloys. Mater. Chem. Phys. 81(2–3), 417 (2003).Google Scholar
Special Metals Corporation: Data Sheet Udimet Alloy, 720 (2004).Google Scholar
Special Metals Corporation: Data Sheet Waspaloy (2004).Google Scholar
Aba-Perea, P.E., Pirling, T., Withers, P.J., Kelleher, J., Kabra, S., and Preuss, M.: Determination of the high temperature elastic properties and diffraction elastic constants of Ni-base superalloys. Mater. Des. 89, 856 (2016).CrossRefGoogle Scholar
Bhowal, P.R., Wright, E.F., and Raymond, E.L.: Effects of cooling rate and γ′ morphology on creep and stress-rupture properties of a powder metallurgy superalloy. Metall. Trans. A 21(6), 1709 (1990).CrossRefGoogle Scholar
Jackson, M.P. and Reed, R.C.: Heat treatment of UDIMET 720Li: The effect of microstructure on properties. Mater. Sci. Eng., A 259(1), 85 (1999).Google Scholar
Sinharoy, S., Virro-Nic, P., and Milligan, W.W.: Deformation and strength behavior of two nickel-base turbine disk alloys at 650 °C. Metall. Mater. Trans. A 32(8), 2021 (2001).CrossRefGoogle Scholar
Locq, D., Caron, P., Raujol, S., Pettinari-Sturmel, F., Coujou, A., and Clément, N.: On the role of tertiary γ′ precipitates in the creep behaviour at 700 C of a PM disk superalloy. In Proceedings 10th International Symposium on Superalloys, Green, K.A., Pollock, T.M., Harada, H., Howson, T.E., Reed, R.C., Schirra, J.J., and Walston, S., eds. (The Minerals, Metals and Materials Society, Warrendale, 2004); pp. 179–187.Google Scholar
Yan, H-Y., Coakley, J., Vorontsov, V.A., Jones, N.G., Stone, H.J., and Dye, D.: Alloying and the micromechanics of Co–Al–W–X quaternary alloys. Mater. Sci. Eng., A 613, 201 (2014).CrossRefGoogle Scholar
Zenk, C.H., Neumeier, S., Stone, H.J., and Göken, M.: Mechanical properties and lattice misfit of γ/γ′ strengthened Co-base superalloys in the Co–W–Al–Ti quaternary system. Intermetallics 55, 28 (2014).Google Scholar
Preuss, M., da Fonseca, J.Q., Kyriakoglou, I., Withers, P.J., and Baxter, G.J.: Characterization of γ′ across inertia friction welded alloy 720Li. In Proceedings 10th International Symposium on Superalloys, Green, K.A., Pollock, T.M., Harada, H., Howson, T.E., Reed, R.C., Schirra, J.J., and Walston, S., eds. (The Minerals, Metals and Materials Society, Warrendale, 2004); pp. 477–484.Google Scholar
Collins, H.E.: Relative stability of carbide and intermetallic phases in nickel-base superalloys. In Proceedings 1st International Symposium on Structural Stability of Superalloys, Donachie, M.J., ed. (Joint Committees of ASTM, ASME, ASM, and AIME, Seven Springs, Pennsylvania, 1968); pp. 171–198.Google Scholar
Mannan, S., Patel, S., and de Barbadillo, J.: Long term thermal stability of Inconel alloys 718, 706, 909, and Waspaloy at 593 °C and 704 °C. In Proceedings 9th International Symposium on Superalloys, Pollock, T.M., Kissinger, R.D., Bowman, R.R., Green, K.A., McLean, M., Olson, S., and Schirra, J.J., eds. (The Minerals, Metals and Materials Society, Warrendale, 2000); pp. 449–458.Google Scholar
Cao, W-D.: Thermal stability characterization of Ni-base ATI 718PLUS®. In Proceedings 11th International Symposium on Superalloys, Reed, R.C., Green, K.A., Caron, P., Gabb, T.P., Fahrmann, M.G., Huron, E.S., and Woodard, S.A., eds. (The Minerals, Metals and Materials Society, Warrendale, 2008), pp. 789–797.Google Scholar
Helm, D. and Roder, O.: Influence of long term exposure in air on microstructure, surface stability and mechanical properties of Udimet 720Li. In Proceedings 9th International Symposium on Superalloys, Pollock, T.M., Kissinger, R.D., Bowman, R.R., Green, K.A., McLean, M., Olson, S., and Schirra, J.J., eds. (The Minerals, Metals and Materials Society, Warrendale, 2000); pp. 487–493.Google Scholar
Sondhi, S.K., Dyson, B.F., and McLean, M.: Tension–compression creep asymmetry in a turbine disc superalloy: Roles of internal stress and thermal ageing. Acta Mater. 52(7), 1761 (2004).Google Scholar
Suzuki, A., Inui, H., and Pollock, T.M.: L12-strengthened cobalt-base superalloys. Annu. Rev. Mater. Res. 45(1), 345 (2015).Google Scholar
Gopinath, K., Gogia, A.K., Kamat, S.V., Balamuralikrishnan, R., and Ramamurty, U.: Low cycle fatigue behaviour of a low interstitial Ni-base superalloy. Acta Mater. 57(12), 3450 (2009).Google Scholar