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Tensile Properties and Fracture Behavior of ATI 718Plus Alloy at Room and Elevated Temperatures

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Abstract

The effect of temperature over the range of ambient to 704 °C and strain rate from 10−4 to 10−2 s−1 on the tensile properties and fracture behavior of ATI 718Plus was investigated. The results showed that with increase in temperature at a strain rate 10−4 s−1, there is a small reduction in the yield strength, but a large drop in ductility at 704 °C. This reduction was accompanied by a change in fracture mode from ductile transgranular to brittle intergranular cracking. Detailed analysis of the microstructure and microchemistry of the areas around the crack using electron microscopy showed that the driving mechanism behind the failure at elevated temperatures and slow strain rates is oxygen-induced intergranular cracking, a dynamic embrittlement mechanism. In addition, the results suggest that the δ precipitates on the grain boundaries tend to oxidize and may facilitate the oxygen-induced intergranular cracking. Finally, an increase in strain rate at 704 °C caused a small increase in the yield strength and a huge increase in ductility. This increase in ductility was accompanied by a change in fracture mode from brittle-to-ductile failure. Possible mechanisms for the deformation, failure mechanisms, and strain rate dependence are discussed.

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Acknowledgments

The authors are grateful for financial support of this research by the National Science Foundation (Grant no CMMI-1334538, CMMI-1335204, and MRI-1531593) and ATI Specialty Metals for providing the 718Plus material used in this study. We also gratefully acknowledge the contribution of the State of Ohio, Department of Development and Third Frontier Commission (Grant no. TECH 10-014), which provided funding in support of the “Ohio Center for Laser Shock Processing for Advanced Materials and Devices” and the equipment in the center that was used in this work. The authors are also grateful to the AMCC at the University of Cincinnati and the CEMAS at the Ohio State University for use of the electron microscopy facilities in the study. The collaboration with Cincinnati State Technical and Community College through the NSF-funded Louis Stokes Alliances for Minority Participation (LSAMP) Program (Grant no. HRD 1304371) that supported the undergraduate research work of Mr. Omar Eddins, Mr. William Edwards, Mr. Gabriel Dennery, and Mr. Naasson Crawford on this project is also acknowledged. We would like to thank Miss Marianne Robison for her help proofreading this manuscript. Any opinions, findings, conclusions, or recommendations expressed in these documents are those of the author(s) and do not necessarily reflect the views of the NSF or the State of Ohio, Department of Development.

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Authors and Affiliations

  1. Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA

    Micheal Kattoura, Seetha R. Mannava & Vijay K. Vasudevan

  2. Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, 43210, USA

    Gopal B. Viswanathan

  3. Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX, 75080, USA

    Dong Qian

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  1. Micheal Kattoura
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Correspondence to Micheal Kattoura.

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Manuscript submitted December 5, 2020; accepted May 5, 2021.

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Kattoura, M., Viswanathan, G.B., Mannava, S.R. et al. Tensile Properties and Fracture Behavior of ATI 718Plus Alloy at Room and Elevated Temperatures. Metall Mater Trans A 52, 3553–3569 (2021). https://doi.org/10.1007/s11661-021-06329-y

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