Microstructures and Mechanical Properties of Inconel 718 Alloy at Ultralow Temperatures
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The microstructures and mechanical properties of powder metallurgy Inconel 718 alloy were investigated in the temperatures range between 25 and − 253 °C. Tensile strength increased with the decrease in temperature, while the ductility first increased and then decreased. There was no significant change in impact toughness. When the temperature was − 253 °C, a zigzag stress–strain curve was observed for the alloy, owing to the interaction of dislocation glide and twinning, which effectively maintained the relatively good ductility.
KeywordsInconel 718 alloy mechanical properties microstructure powder metallurgy ultralow temperature
The authors would like to thank the financial support of the National Natural Science Foundation of China (U1637210) and the Project of Innovation-driven Plan in Central South University (51271203). The authors would also like to thank Kathryn Sole, PhD, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
- 13.E.A. Loria, Superalloys 718, 625, 706 and Various Derivatives, TMS, Warrendales, 1994, p 545–555Google Scholar
- 21.A. Nowotnik and J. Sieniawski, Effect of Thermomechanical Working on the Microstructure and Mechanical Properties of Hot Pressed Superalloy Inconel 718. Superalloy 718 and Derivatives, John Wiley & Sons, Inc., Hoboken, 2012, p 382–396Google Scholar
- 23.A.K. Koul, W. Wallace, and R. Thamburaj, Problems and Possibilities for Life Extension in Gas Turbine Components, AGARD Conference Proceedings, Vol 368, 1984, p 10.1–10.32Google Scholar
- 24.Z. Zhang, Z.H. Tu, L.F. Li, L. Zhao, and D. Jin, Multi-necking in Tension of Titanium Alloy at Low Temperature, Chin. J. Low Temp. Phys., 1995, 17, p 238–241Google Scholar
- 25.Z. Zhang, Z.H. Tu, L.F. Li, L. Zhao, and D. Jin, Investigation of the Effect of Temperatures on Tensile Load Drops of Titanium Alloy, Acta Metall. Sin., 1997, 22, p 198–202Google Scholar
- 26.Y.J. Wu, T. Lan, and L. Zhou, Deformation Phenomenon of P/M Ti-5Al-2.5Sn(ELI) Alloy, Rare Met. Mater. Eng., 2005, 34, p 406–408Google Scholar
- 27.M.H. Huang, Research on Low Temperature Brittleness of Malleable Cast Iron, J. Kunming Univ. Sci. Technol., 1997, 6, p 135–137Google Scholar
- 28.A. Seeger, Dislocation and Mechanical Property of Crystals, Wiley, New York, 1957, p 243–250Google Scholar