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.
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