Abstract
TEM characterization of the deformation micromechanisms in the case of AD730TM disk superalloy has been performed in order to identify the relevant parameters controlling its creep behavior at 700 °C under 600 or 850 MPa. The creep behavior has been investigated for different microstructures resulting from different heat treatments: a coarse grain (CG) and a fine grain microstructures (FG). The specific influence of the primary γ′ precipitates, which are only present in the fine grain microstructure, is of main focus. TEM observations indicate that, in the first stage of the creep deformation, primary γ′ precipitates may act as dislocation sources. The stability of this phase was confirmed using samples aged at 850 °C for several hundreds of hours. TEM spectroscopy has been used to characterize the local chemical composition after aging. A clear evolution of these primary γ′ precipitates has been evidenced and a dissolution of the secondary γ′ precipitates during aging. The presence of these primary γ′ precipitates induces a strong localization of the deformation. Its detrimental effect on the creep properties in the case of polycrystalline Ni-based superalloy at high temperature may be concluded.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Jackson MP, Reed RC (1999) Heat treatment of UDIMET 720Li: the effect of microstructure on properties. Mater Sci Eng A 259 (1): 85–97. https://doi.org/10.1016/s0921-5093(98)00867-3.
Devaux A, Picqué B, Gervais MF, Georges E, Poulain T, Heritier P (2012) AD730 TM - A new nickel-based superalloy for high temperature engine rotative parts. Superalloys 2012 911–919. https://doi.org/10.1002/9781118516430.ch100.
Devaux A, Helstroffer A, Cormier J, Villechaise P, Douin J, Hantcherli M, Pettinari-Sturmel F (2014) Effect of aging heat-treatment on mechanical properties of AD730TM superalloy. 8th Int Symp Superalloy 718 Deriv 521–535. https://doi.org/10.1002/9781119016854.ch41.
Devaux A, Berglin L, Thebaud L, Delattre R, Crozet C, Nodin O. (2014) Mechanical properties and development of supersolvus heat treated new nickel base superalloy AD730 TM. MATEC Web Conf 14 01004. https://doi.org/10.1051/matecconf/20141401004.
Flageolet B (2005) Effets du vieillissement du superalliage base nickel pour disques de turbines N18 sur sa durabilité en fatigue et en fatigue-fluage à 700°C. Ph.D Thesis, Poitiers University.
Billot T (2010) Comportement et endommagement en fatigue et fatigue-fluage à haute température de différents états microstructuraux du superalliage base-nickel Udimet 720, PhD Thesis, Poitiers University.
Raujol S, Pettinari F, Locq D, Caron P, Coujou A, Clement N (2004) Creep straining micro-mechanisms in a powder-metallurgical nickel-based superalloy. Mater Sci Eng A 387–389 678–682. https://doi.org/10.1016/j.msea.2004.02.091.
Viswanathan GB, Sarosi PM, Henry MF, Whitis DD, Milligan W.W, Mills M.J (2005) Investigation of creep deformation mechanisms at intermediate temperatures in René 88 DT. Acta Mater 53 (10): 3041–3057. https://doi.org/10.1016/j.actamat.2005.03.017.
Kozar RW, Suzuki A, Milligan WW, Schirra J.J, Savage M. F, Pollock T. M (2009) Strengthening Mechanisms in Polycrystalline Multimodal Nickel-Base Superalloys. Metall Mater Trans A 40 (7): 1588–1603. https://doi.org/10.1007/s11661-009-9858-5.
Hoffelner W, Kny LE, Stickler R, McCall WJ (1979) Effects of aging treatments on the Microstructure of the Ni-base superalloy IN-738. Materwiss Werksttech 10 (3): 84–92. https://doi.org/10.1002/mawe.19790100307.
Wlodek ST, Kelly M, Alden DA (1996) The Structure of Rene’ 88DT. Superalloys 1996 (Eighth Int Symp 129–136. https://doi.org/10.7449/1996/superalloys_1996_129_136.
Giraud R, Hervier Z, Cormier J, Saint-Martin G, Hamon F, Milhet X, Mendez J (2013) Strain effect on the γ′ dissolution at high temperatures of a nickel-based single crystal superalloy. Metall Mater Trans A Phys Metall Mater Sci 44 (1): 131–146. https://doi.org/10.1007/s11661-012-1397-9.
Shahriari D, Sadeghi MH, Akbarzadeh A (2009) γ’ Precipitate dissolution during heat treatment of nimonic 115 superalloy. Mater Manuf Process 24 (5): 559–563. https://doi.org/10.1080/10426910902746820.
Masoumi F, Jahazi M, Shahriari D, Cormier J (2016) Coarsening and dissolution of γ′ precipitates during solution treatment of AD730TM Ni-based superalloy: Mechanisms and kinetics models. J Alloys Compd 658 981–995. https://doi.org/10.1016/j.jallcom.2015.11.002.
Décamps B, Morton AJ, Condat M (1991) On the mechanism of shear of γ′ precipitates by single (a/2) ⟨110⟩ dissociated matrix dislocations in Ni-based superalloys. Philos Mag A 64 (October 2014): 37–41. https://doi.org/10.1080/01418619108204866.
Locq D (2014) Etude du superalliage C&W A&D AD730. Rapport Interne - ONERA
Oblak JM, Doherty JE, Giamei AF, Kear BH (1974) Met Trans (5):1252–1255. https://doi.org/10.1007/BF026444342
Cadel E, Lemarchand D, Chambreland S, Blavette D (2002) Acta Mat 5(5):957–966. https://doi.org/10.1016/S1359-6454(01)00395-0
Laurence (2016) Ph.D. thesis, Ecole Nationale Supérieure de Mécanique et Aérotechnique – France
Thébaud L (2017) Ph.D. thesis, Universié de Poitiers, France
Vultos W (2019) Ph.D. thesis, Université de Toulouse, France
Acknowledgements
Authors are grateful to Aubert & Duval—Group Eramet, and more specifically Dr. Alexandre Devaux, for providing the material and for stimulating discussions.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 The Minerals, Metals & Materials Society
About this paper
Cite this paper
Pettinari-Sturmel, F. et al. (2020). Contribution of Primary γ′ Precipitates in the Deformation Creep Mechanisms in the Ni-Based Polycrystalline AD730TM Superalloy. In: Tin, S., et al. Superalloys 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-51834-9_59
Download citation
DOI: https://doi.org/10.1007/978-3-030-51834-9_59
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-51833-2
Online ISBN: 978-3-030-51834-9
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)