Microstructure and stability conditions for hot deformation of a modified iron-based superalloy
| Autor: | Jaime Llaneza, Manuel Carsí, Oscar Antonio Ruano |
|---|---|
| Přispěvatelé: | Comisión Interministerial de Ciencia y Tecnología, CICYT (España) |
| Rok vydání: | 2019 |
| Předmět: |
High strain rate
Materials science chemistry.chemical_element 02 engineering and technology 01 natural sciences Carbide 0103 physical sciences Formability General Materials Science Torsion testing 010302 applied physics Iron-based superalloy Lyapunov criterion Hot forming Mechanical Engineering Metallurgy Torsion (mechanics) 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Garofalo equation Superalloy chemistry Mechanics of Materials Iron based 0210 nano-technology Titanium |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1743-2847 0267-0836 |
| Popis: | A modified iron-based superalloy is studied regarding its hot formability. The microstructure contained particles of titanium carbides, carbonitrides and nitrates. Torsion tests at high strain rate at temperatures ranging from 800 to 1200°C were conducted. Results of these tests were correlated by means of the Garofalo hyperbolic sine creep relation. An optimum forming temperature of 1260°C at 10 s−1 is obtained. This temperature is strongly dependent on the strain rate. An activation energy for plastic deformation close to that for the activation energy for lattice diffusion in austenitic stainless steels and a stress exponent near 5 were obtained. These values suggest that plastic deformation is controlled by a dislocation climb mechanism. This research is financially supported by CYCYT, Spain, program MAT2015-68919. |
| Databáze: | OpenAIRE |
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