Effect of α-α´ phase separation on notch impact behavior of oxide dispersion strengthened (ODS) Fe20Cr5Al alloy
The effects of Fe-rich (α) and Cr-enriched (α′) phase separation, occurring during aging at 475 °C on the microstructure and mechanical properties of Fe–20Cr–6Al ODS alloy (PM2000™) hot-rolled tube, were investigated by means of atom probe tomography, microhardness, tensile and V-notched Charpy impa...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/88475 |
| Acceso en línea: | http://hdl.handle.net/10261/88475 |
| Access Level: | acceso abierto |
| Palabra clave: | Toughness Phase separation Mechanical alloying Tomography Oxide dispersion strengthened ferritic alloys |
| Sumario: | The effects of Fe-rich (α) and Cr-enriched (α′) phase separation, occurring during aging at 475 °C on the microstructure and mechanical properties of Fe–20Cr–6Al ODS alloy (PM2000™) hot-rolled tube, were investigated by means of atom probe tomography, microhardness, tensile and V-notched Charpy impact tests. Disregarding of the aging treatment, this material presents splitting of crack-divider type in longitudinal-transverse (LT) specimens, whereas crack-arrester type is observed in longitudinal-short transverse (LS) specimens, which induces significant differences in ductile-to-brittle transition temperature (DBTT) and upper shelf energy (USE). Additionally, a significant increase in DBTT and decrease in USE were recorded during aging at 475 °C as a function of aging time. The main cause of embrittlement is the α–α′ phase separation with an apparent activation energy measured in the range of 214–240 kJ/mol, which is consistent with the activation energy for Cr diffusion in this type of alloy |
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