Počet záznamů: 1  

Superplasticity of Inconel 718 after processing by high-pressure sliding (HPS)

  1. 1. 0476917 - UFM-A 2018 RIV CH eng J - Článek v odborném periodiku
    Takizawa, Y. - Kajita, T. - Král, Petr - Masuda, T. - Watanabe, K. - Yumoto, M. - Otagiri, Y. - Sklenička, Václav - Horita, Z.
    Superplasticity of Inconel 718 after processing by high-pressure sliding (HPS).
    Materials Science and Engineering A-Structural materials. Roč. 682, JAN (2017), s. 603-612. ISSN 0921-5093
    Institucionální podpora: RVO:68081723
    Klíčová slova: High-pressure sliding (HPS) * Severe plastic deformation (SPD) * Ni-based superalloy * Superplasticity * Grain boundary sliding * Lattice diffusion
    Kód oboru RIV: JG - Hutnictví, kovové materiály
    Obor OECD: Materials engineering
    Impakt faktor: 3.414, rok: 2017

    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.
    Trvalý link: http://hdl.handle.net/11104/0273460