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Highly non-linear creep life induced by a short close γ′-solvus overheating and a prior microstructure degradation on a nickel-based single crystal superalloy

le Graverend, J.-B. and Cormier, J. and Gallerneau, F. and Kruch, S. and Mendez, J. (2014) Highly non-linear creep life induced by a short close γ′-solvus overheating and a prior microstructure degradation on a nickel-based single crystal superalloy. Materials and Design, 56 . pp. 990-997. ISSN 0261-3069. http://resolver.caltech.edu/CaltechAUTHORS:20140411-095020510

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Abstract

Specific non-isothermal creep conditions were applied to a 1st generation single crystal nickel based superalloy at very high temperature. Creep tests were conducted under 120 and 160 MPa at 1050 °C with one overheating under stress at 1200 °C for 30 s. Results were compared to the ones already obtained under 140 MPa on the same alloy as well as on a fourth generation of alloy. It is shown that the residual creep life after a single overheating is optimal after a specific prior-creep time. The impact of the creep degradation prior to an overheating on the creep life is dependent on the magnitude of the effective γ/γ′ lattice mismatch. Indeed, an overheating performed when the effective γ/γ′ mismatch magnitude is maximum leads to longer creep lives, even better than without overheating.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.matdes.2013.12.025DOIArticle
http://www.sciencedirect.com/science/article/pii/S0261306913011588PublisherArticle
Additional Information:© Elsevier Ltd. Received 20 August 2013; Accepted 10 December 2013; Available online 19 December 2013. The authors are particularly grateful to Turbomeca – SAFRAN group for providing the material and to the French Ministry of Defense for its financial support. This work was conducted under the French program "PRC Structures Chaudes" involving Snecma-SAFRAN group, Turbomeca-SAFRAN group, ONERA and CNRS laboratories (Mines Paris Tech, Institut Pprime-ENSMA, LMT-Cachan, LMS-X, CIRIMAT-ENSIACET and CEAT). J.-B. le Graverend is also grateful to D. Pacou, V. Bonnand and R. Degeilh for stimulating discussions. J. Cormier and J. Mendez gratefully acknowledge Turbomeca – SAFRAN group for a continuous collaboration over 10 years, as well as Dr. Z. Hervier (Materials Department at Turbomeca) and Dr. E. Ostoja-Kuczynski (Method Department at Turbomeca) for their continuous interest in this work.
Funders:
Funding AgencyGrant Number
French Ministry of DefenseUNSPECIFIED
Subject Keywords:Nickel base single crystal superalloy; Non-isothermal loadings; Microstructural evolutions; γ/γ′ Lattice mismatch; γ′ Dissolution/precipitation; Creep
Record Number:CaltechAUTHORS:20140411-095020510
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140411-095020510
Official Citation:le Graverend, J. B., Cormier, J., Gallerneau, F., Kruch, S., & Mendez, J. (2014). Highly non-linear creep life induced by a short close γ′-solvus overheating and a prior microstructure degradation on a nickel-based single crystal superalloy. Materials & Design, 56(0), 990-997. doi: http://dx.doi.org/10.1016/j.matdes.2013.12.025
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44889
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:11 Apr 2014 18:38
Last Modified:11 Apr 2014 18:38

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