Connecting the Microstructure Stability of Ni Based Superalloys to their Chemical Compositions

Abstract:

The degradation of creep resistance in Nickel-based single crystal superalloys is essentially ascribed to their microstructure evolution. Yet there is a lack of work that manages to simulate the effect of alloying element concentrations on microstructure degradation. In this research, a computational model is developed to connect the rafting kinetics of Ni superalloys with their chemical composition, by combining thermodynamics calculation and an energy-based microstructure model. The isotropic coarsening rate and γ/γ misfit stresses have been selected as composition related parameter, and the effect of service temperature, time and applied stress are also taken into consideration to simulate the evolutions of microstructure parameters during creep process. The different generations of commercial Ni superalloys are selected and their chemical compositions are calculated based on this model. The simulated microstructure parameters are validated by the results from experimental results and the existing analytical model. The capability of the model in predicting the microstructure characteristics may provide instructional thought in developing a novel computational guided design approach in Ni superalloys.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 967-975
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.967
• Online since: December 2018
• Authors: Hao Yu, Wei Xu*, Sybrand van der Zwaag
• Keywords: Composition, Computational Design, Microstructure Evolution, Ni Superalloy

References

[1] R.C. Reed, The superalloys: fundamentals and applications, Cambridge university press2008.

[2] Z. Zhu, H. Basoalto, N. Warnken, R. Reed, A model for the creep deformation behaviour of nickel-based single crystal superalloys, Acta Mater 60(12) (2012) 4888-4900.

DOI: 10.1016/j.actamat.2012.05.023

[3] B. Dyson, Microstructure based creep constitutive model for precipitation strengthened alloys: theory and application, Mater Sci Technol-lond 25(2) (2009) 213-220.

DOI: 10.1179/174328408x369348

[4] F. Nabarro, C.M. Cress, P. Kotschy, The thermodynamic driving force for rafting in superalloys, Acta Mater 44(8) (1996) 3189-3198.

DOI: 10.1016/1359-6454(95)00423-8

[5] T. Ohashi, K. Hidaka, S. Imano, Elastic stress in single crystal Ni-base superalloys and the driving force for their microstructural evolution under high temperature creep conditions, Acta Mater 45(5) (1997) 1801-1810.

DOI: 10.1016/s1359-6454(96)00324-2

[6] B. Fedelich, A. Epishin, T. Link, H. Klingelhöffer, G. Künecke, P.D. Portella, Rafting during high temperature deformation in a single crystal superalloy: experiments and modeling, Superalloys 2012, TMS, 2012, pp.491-500.

DOI: 10.1002/9781118516430.ch54

[7] R. Rettig, N.C. Ritter, H.E. Helmer, S. Neumeier, R.F. Singer, Single-crystal nickel-based superalloys developed by numerical multi-criteria optimization techniques: design based on thermodynamic calculations and experimental validation, Model Simul Mater Sc 23(3) (2015) 035004.

DOI: 10.1088/0965-0393/23/3/035004

[8] R. Reed, T. Tao, N. Warnken, Alloys-by-design: application to nickel-based single crystal superalloys, Acta Mater 57(19) (2009) 5898-5913.

DOI: 10.1016/j.actamat.2009.08.018

[9] B. Fedelich, G. Künecke, A. Epishin, T. Link, P. Portella, Constitutive modelling of creep degradation due to rafting in single-crystalline Ni-base superalloys, Mater Sci Eng A 510-511 (2009) 273-277.

DOI: 10.1016/j.msea.2008.04.089

[10] Y.-N. Fan, H.-J. Shi, W.-H. Qiu, Constitutive modeling of creep behavior in single crystal superalloys: Effects of rafting at high temperatures, Mater Sci Eng A 644 (2015) 225-233.

DOI: 10.1016/j.msea.2015.07.058

[11] D. Dye, J. Coakley, V. Vorontsov, H. Stone, R. Rogge, Elastic moduli and load partitioning in a single-crystal nickel superalloy, Scripta Mater 61(2) (2009) 109-112.

DOI: 10.1016/j.scriptamat.2009.03.008

[12] A. Sato, H. Harada, A.-C. Yeh, K. Kawagishi, T. Kobayashi, Y. Koizumi, T. Yokokawa, J. Zhang, A 5th generation SC superalloy with balanced high temperature properties and processability, Superalloys (2008) 131-138.

DOI: 10.7449/2008/superalloys_2008_131_138

[13] Y. Koizumi, T. Kobayashi, T. Yokokawa, J. Zhang, M. Osawa, H. Harada, Y. Aoki, M. Arai, Development of next-generation Ni-base single crystal superalloys, Superalloys 2004 (2004) 35-43.

DOI: 10.7449/2004/superalloys_2004_35_43

[14] S. Tian, Y. Su, B. Qian, X. Yu, F. Liang, A. Li, Creep behavior of a single crystal nickel-based superalloy containing 4.2% Re, Mater Design 37 (2012) 236-242.

DOI: 10.1016/j.matdes.2012.01.008

[15] J. Gong, D. Snyder, T. Kozmel, C. Kern, J.E. Saal, I. Berglund, J. Sebastian, G. Olson, ICME Design of a Castable, Creep-Resistant, Single-Crystal Turbine Alloy, JOM (2017) 1-6.

DOI: 10.1007/s11837-017-2300-3

[16] J. Zhang, T. Murakumo, H. Harada, Y. Koizumi, Dependence of creep strength on the interfacial dislocations in a fourth generation SC superalloy TMS-138, Scripta Mater 48(3) (2003) 287-293.

DOI: 10.1016/s1359-6462(02)00379-2

[17] A.-C. Yeh, A. Sato, T. Kobayashi, H. Harada, On the creep and phase stability of advanced Ni-base single crystal superalloys, Mater Sci Eng A 490(1-2) (2008) 445-451.

DOI: 10.1016/j.msea.2008.02.008

[18] A. Epishin, T. Link, H. Klingelhöffer, B. Fedelich, U. Brückner, P.D. Portella, New technique for characterization of microstructural degradation under creep: Application to the nickel-base superalloy CMSX-4, Mater Sci Eng A 510 (2009) 262-265.

DOI: 10.1016/j.msea.2008.04.135