Microstructural and Rotating-Bending Fatigue Behavior Relationship in Nanostructured Carbo-Austempered Cast Steels
| Autor: | Adriana Eres-Castellanos, Claudia Patricia Serna-Giraldo, Oscar Ríos-Diez, Carlos Garcia-Mateo, Ricardo Emilio Aristizábal-Sierra |
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| Přispěvatelé: | Universidad de Antioquia, CSIC - Centro Nacional de Investigaciones Metalúrgicas (CENIM) |
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Austenite Cyclic stress Materials science Structural material Silicon Metallurgy 0211 other engineering and technologies Metals and Alloys chemistry.chemical_element Fracture mechanics 02 engineering and technology Condensed Matter Physics Microstructure 01 natural sciences chemistry Mechanics of Materials Ferrite (iron) 0103 physical sciences Nanobainitic steels Multiphasic microstructures 021102 mining & metallurgy Electron backscatter diffraction Carbo-austempering processes |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Carbo-austempering processes have been established as a viable alternative to conventional carburized—quenched and tempered (Q&T) steels for components subjected to wear and contact fatigue conditions. However, little information is available about the rotating-bending fatigue performance of carbo-austempered nanobainitic steels. In this article, the rotating-bending fatigue behavior of a high silicon cast steel subjected to different carbo-austempering processes has been evaluated. The implemented heat treatments were designed to lead to nanobainitic microstructures in the case and to obtain different microstructures in the core, including multiphasic microstructures achieved by intercritical austenitization. The results were compared with the ones given by a conventional carburized-Q&T specimen. The microstructural features involved in crack propagation during the cyclic fatigue were evaluated by means of electron backscatter diffraction (EBSD), by scanning the premortem and postmortem samples. Results show that nanobainitic carbo-austempered cast steels exhibit better fatigue performance than traditional carburized-Q&T steels, which is explained in terms of the differences between both microstructures, the role of both ferrite and austenite crystals in crack propagation, the importance of prior austenite boundaries and block boundaries as crack deflectors, and how all these parameters finally have an effect on the fatigue behavior. The authors thank the CODI–Universidad de Antioquia for the financial support for the development of this research under Project No. PRG2017-15869 and the National Center for Metallurgical Research (CENIM) for the support provided for the experimental development of this work. |
| Databáze: | OpenAIRE |
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