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- Title
Influence of Austempering Temperature on Microstructure and Mechanical Properties of High‐Silicon Carbide‐Free Bainitic Steel.
- Authors
Franceschi, Mattia; Pezzato, Luca; Gennari, Claudio; Hanoz, Denise; Bertolini, Rachele; Fabrizi, Alberto; Polyakova, Marina; Brunelli, Katya; Bonollo, Franco; Dabalà, Manuele
- Abstract
The microstructural evolution of a novel high‐silicon carbide‐free bainitic steel at different austempering temperatures is investigated. The microstructure is evaluated by means of optical and electron microscopy, X‐ray diffraction, microhardness, and nanohardness. Results show a variation in the amount of stabilized retained austenite changing the temperature of the isothermal treatment. In particular, it is observed an increase in the retained austenite volume fraction increasing the temperature up to 350 °C, while further increase leads to a reduction. Moreover, increasing the isothermal holding temperature from 250 °C, through 300, 350, and 370 °C, a progressive bainite coarsening and an increase in the amount of stabilized carbon‐enriched retained austenite are observed. Tensile tests reveal an excellent combination of mechanical properties: mechanical strength in the range 1276–1988 MPa and total elongation 0.18–0.44.
- Subjects
BAINITIC steel; ISOTHERMAL temperature; MICROSTRUCTURE; TENSILE tests; ELECTRON microscopy
- Publication
Steel Research International, 2023, Vol 94, Issue 9, p1
- ISSN
1611-3683
- Publication type
Article
- DOI
10.1002/srin.202200821