Hot Deformation Behavior of Haynes 25 by the Hot Tensile Test

Authors

Metallic Materials Research Center, Malek Ashtar University of Technology, Tehran, Iran.

Abstract

In the present work, hot tensile behavior of Haynes 25 Co-base alloy was investigated in the temperature range of 950-1200 ˚C and 0.1 s-1. Thermodynamic calculations showed that M23C6 and M6C carbides were stable below 1000 ˚C and above 1050 ˚C, respectively. Stress-strain curves also indicated an unusual trend of strain fracture. It was observed that with increasing temperature from 950 to 1050 ˚C, the fracture strain was decreased, while it was raised above 1050 ˚C again. Increasing the volume fraction of M6C carbide rich in Tungsten resulted in the loss of ductility. Also, microstructural evaluations showed dynamic recrystallization (DRX) grains were nucleated and growth was around carbides and the initial grains at 1150 ˚C. Occurrence of DRX led to the improvement of ductility via grain refinement mechanism, so this alloy had the highest level of ductility at 1150 ˚C

Keywords


1. Davis, J. R., Nickel, Cobalt, and Their Alloys, ASM Specialty Handbook, 2000.
2. Zhang, S., and Zhao, D., Aerospace Materials Handbook, CRC Press, 2012.
3. Donachie, M. J., and Donachie, S. J., Superalloys: A Technical Guide, ASM International, 2002.
4. Favre, J., Fabrègue, D., Maire, E., and Chiba, A., “Grain Growth and Static Recrystallization Kinetics in Co-20Cr-15W-10Ni (L-605) Cobalt-Base Superalloy”, Philosophical Magazine, Vol. 94, pp. 1992-2008, 2014.
5. Chandler, H., Heat Treater's Guide: Practices and Procedures for Nonferrous Alloys, ASM International, 1996.
6. Teague, J., Cerreta, E., and Stout, M., “Tensile Properties and Microstructure of Haynes 25 Alloy After Aging at Elevated Temperatures for Extended Times”, Metallurgical and Materials Transactions A, Vol. 35, pp. 2767-2781, 2004.
7. Gupta, R., Karthikeyan, M., Bhalia, D., Ghosh, B., and Sinha, P., “Effect of Microstructure on Mechanical Properties of Refractory Co-Cr-W-Ni Alloy”, Metal Science and Heat Treatment, Vol. 50, pp. 175-179, 2008.
8. Lin, Y., Deng, J., Jiang, Y. Q., Wen, D. X., and Liu, G., “Hot Tensile Deformation Behaviors and Fracture Characteristics of A Typical Ni-Based Superalloy”, Materials & Design, Vol. 55, pp. 949-957, 2014.
9. Jang, M. J., Praveen, S., Sung, H. J., Bae, J. W., Moon, J., and Kim, H. S., “High-Temperature Tensile Deformation Behavior of Hot Rolled CrMnFeCoNi High-Entropy Alloy”, Journal of Alloys and Compounds, Vol. 730, pp. 242-248, 2018.
10. Favre, J., Koizumi, Y., Chiba, A., Fabregue, D., and Maire, E., “Deformation Behavior and Dynamic Recrystallization of Biomedical Co-Cr-W-Ni (L-605) Alloy”, Metallurgical and Materials Transactions A, Vol. 44, pp. 2819-2830, 2013.
11. ASTM, F90-01: Standard Specification for Wrought Cobalt-20Chromium-15Tungsten-10Nickel Alloy for Surgical Implant Applications, 2005.
12. ASTM, 8M. Standard Test Methods of Tension Testing of Metallic Materials [metric], 2003.
13. Yamanaka, K., Mori, M., and Chiba, A., “Effects of Carbon Concentration on Microstructure and Mechanical Properties of As-cast Nickel-Free Co-28Cr-9W-Based Dental Alloys”, Materials Science and Engineering: C, Vol. 40, pp. 127-134, 2014.
14. Beaven, P., Swann, P., and West, D., “Carbide Precipitation in Certain Alloys of The Co-Ni-Cr-C System”, Journal of Materials Science, Vol. 14, pp. 354-364, 1979.
15. Ueki, K., Ueda, K., and Narushima, T., “Microstructure and Mechanical Properties of Heat-Treated Co-20Cr-15W-10Ni Alloy for Biomedical Application”, Metallurgical and Materials Transactions A, Vol. 47, pp. 2773-2782, 2016.
16. Gui, W., Zhang, H., Yang, M., Jin, T., Sun, X., and Zheng, Q., “The Investigation of Carbides Evolution in a Cobalt-Base Superalloy at Elevated Temperature”, Journal of Alloys and Compounds, Vol. 695, pp. 1271-1278, 2017.
17. Lee, S. H., Takahashi, E., Nomura, N., and Chiba, A., “Effect of Carbon Addition on Microstructure and Mechanical Properties of a Wrought Co-Cr-Mo Implant Alloy”, Materials Transactions, Vol. 47, pp. 287-290, 2006.
18. Yamanaka, K., Mori, M., and Chiba, A., “Developing High Strength and Ductility in Biomedical Co-Cr Cast Alloys by Simultaneous Doping With Nitrogen and Carbon”, Acta Biomaterialia, Vol. 31, pp. 435-447, 2016.
19. Yamanaka, K., Mori, M., Kuramoto, K., and Chiba, A., “Development of New Co-Cr-W-Based Biomedical Alloys: Effects of Microalloying and Thermomechanical Processing on Microstructures and Mechanical Properties”, Materials & Design, Vol. 55, pp. 987-998, 2014.
20. Yamanaka, K., Mori, M., and Chiba, A., “Influence of Carbon Addition on Mechanical Properties and Microstructures of Ni-Free Co-Cr-W Alloys Subjected to Thermomechanical Processing”, Journal of the Mechanical Behavior of Biomedical Materials, Vol. 37, pp. 274-285, 2014.

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