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Superplasticity of Inconel 718 after processing by high-pressure sliding (HPS)
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SYSNO ASEP 0476917 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Superplasticity of Inconel 718 after processing by high-pressure sliding (HPS) Author(s) Takizawa, Y. (JP)
Kajita, T. (JP)
Král, Petr (UFM-A) RID, ORCID
Masuda, T. (JP)
Watanabe, K. (JP)
Yumoto, M. (JP)
Otagiri, Y. (JP)
Sklenička, Václav (UFM-A) RID, ORCID
Horita, Z. (JP)Number of authors 9 Source Title Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 682, JAN (2017), s. 603-612Number of pages 10 s. Language eng - English Country CH - Switzerland Keywords High-pressure sliding (HPS) ; Severe plastic deformation (SPD) ; Ni-based superalloy ; Superplasticity ; Grain boundary sliding ; Lattice diffusion Subject RIV JG - Metallurgy OECD category Materials engineering Institutional support UFM-A - RVO:68081723 UT WOS 000393003800069 EID SCOPUS 84998910280 DOI 10.1016/j.msea.2016.11.081 Annotation This study reports a production of a superplastic Ni-based superalloy (Inconel 718) using a process of severe plastic deformation through high-pressure sliding (HPS). The grain size of the alloy was reduced to similar to 120 nm by operating the HPS process under 4 GPa at room temperature with a recently upscaled facility. The ultrafined-grained structure was well retained even after annealing at 1173 K for 1 h. Tensile tests were conducted in air at a testing temperature in the range of 973-1173 K with an initial strain rate of 5.0 x 10(-4)-2.0 x10(-2) s(-1). Superplastic elongation more than 400% were attained at all testing conditions except at 973 K. High-strain rate superplasticity (defined with strain rates higher than 1x10(-2) s(-1)) was achieved at temperatures higher than 1073 K. Electron back scatter diffraction analyses revealed that a preferential orientation of the grains was developed by the HPS processing but it was randomized with tensile deformation. Evaluation of the strain rate sensitivity and the activation energy for the superplastic deformation confirmed that the superplasticity of Inconel 718 was controlled by grain boundary sliding through lattice diffusion. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2018
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