Effects of cooling rate on strength and microstructure of powder metallurgy superalloys

Enes Akca, Ali Gürsel, Gökhan Yıldız

Abstract


The excellent mechanical properties of powder metallurgy superalloys strongly depend on the microstructure, grain size, morphology, and size distribution of the γ' precipitates. In this study, the effects of cooling rate on strength and microstructure of powder metallurgy superalloys were investigated. Articles were reviewed about this topic and they all were evaluated. Different types of powder metallurgy superalloys such as FGH4096, U720LI, UDIMET 500, MAR-M247, K465, IN738LC, Rene88DT, CM247LC and K5 were selected for this study. These materials were tested in different parameters (temperature and time) and different cooling rates were applied. Test results showed that cooling rate has considerable effects on strength and microstructure of powder metallurgy superalloys. It was observed that the strength increased by the increment of cooling rate. Also, almost homogeneous microstructure was obtained at high cooling rate.

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References


J. Mao, K.-M. Chang, W. Yang, K. Ray, S. P. Vaze and D. U. Furrer, "Cooling Precipitation and Strengthening Study in Powder Metallurgy Superalloy U720LI," Metallurgical and Materials Transactions , vol. 32, no. 10, pp. 2441-2452, 2001.

G. Tian, C. Jia, Y. Wen and B. Hu, "Effect of solution cooling rate on the γ' precipitation behaviors of a Ni-base P/M superalloy," Journal of University of Science and Technology Beijing, vol. 15, no. 6, pp. 729-734, 2008.

G. Tian, C. Jia, Y. Wen, G. Liu and B. Hu, "Cooling γ' precipitation behavior and strengthening in powder metallurgy superalloy FGH4096," Rare Metals, vol. 27, no. 4, pp. 410-417, 2008.

S. Sajjadi, H. R. Elahifar and H. Farhangi, "Effects of cooling rate on the microstructure and mechanical properties of the Ni-base superalloy UDIMET 500," Journal of Alloys and Compounds, vol. 455, p. 215–220, 2008.

Y. Zhang, Y. Huang, L. Yang and J. Li, "Evolution of microstructures at a wide range of solidification cooling rate in a Ni-based superalloy," Journal of Alloys and Compounds , vol. 570, p. 70–75, 2013.

Z.-y. Pei, W. Han, G. Zhao, X.-f. Chen, J.-t. Li and Y.-w. Tian, "Effect of Cooling Rate on Microstructure and Mechanical Properties of K465 Superalloy," Jounal of Iron and Steel Research, vol. 16, no. 6, pp. 70-74, 2009.

V. Kavoosi, S. M. Abbasi, S. G. Mirsaed and M. Mostafaei, "Influence of cooling rate on the solidification behavior and microstructure of IN738LC superalloy," Journal of Alloys and Compounds, vol. 680, p. 291–300, 2016.

A. Singh, S. Nag, J. Hwang, G. Viswanathan, J. Tiley, R. Srinivasan, H. Fraser and R. Banerjee, "Influence of cooling rate on the development of multiple generations of γ′ precipitates in a commercial nickel base superalloy," Materials Characterization, vol. 62, pp. 878-886, 2011.

S. Milenkovic, I. Sabirov and J. LLorca, "Effect of the cooling rate on microstructure and hardness of MAR-M247 Ni-based superalloy," Materials Letters, vol. 73, pp. 216-219, 2012.

S. Behrouzghaemi and R. J. Mitchell, Materials Science and Engineering A, vol. 498, pp. 266-271, 2008.

K. K. Mehta, R. Mitra and S. Chawla, "Effect of post-solutionizing cooling rate on microstructure and low cycle fatigue behavior of a cast nickel based superalloy," Materials Science & Engineering A, vol. 611, pp. 280-289, 2014.

E. Akca and A. Gursel, "A Review on Superalloys and IN718 Nickel-Based INCONEL Superalloy," Periodicals of Engineering and Natural Sciences, vol. 3, pp. 15-27, 2015.




DOI: http://dx.doi.org/10.21533/pen.v5i3.85

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ISSN: 2303-4521

Digital Object Identifier DOI: 10.21533/pen

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License