Effect of Multi-Step Austempering Treatment on the Microstructure and Mechanical Properties of a High Silicon Carbide-Free Bainitic Steel with Bimodal Bainite Distribution
(2021) Metals — Vol. 11, n° 12, p. 2055 (2021)
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- Authors
Miotti Bettanini, Alvise 
Pezzato, Luca Dabalà, Manuele
- Abstract
- The effect of multi-step austempering treatments on the microstructure and mechanical properties of a novel medium carbon high silicon carbide-free bainitic steel was studied. Five different isothermal treatment processes were selected, including single-step isothermal treatments above martensite start temperature (at 350°C and 370°C, respectively), and three kinds of two-step routes (370°C + 300°C, 370°C + 250°C, and 350°C + 250°C). In comparison with single-step austempering treatment adopting a two-step process, a microstructure with a bimodal-size distribution of bainitic ferrite and without martensite was obtained. Bainitic transformation was studied using dilatometry both for single-step and two-step routes and the specimens were completely characterised by electron microscopy (SEM and TEM), X-ray diffraction (XRD) and standard tensile tests. The mechanical response of the samples subjected to two-step routes was superior to those treated at a single temperature.
- Affiliations
University of Padova Department of Industrial Engineering
Citations
Franceschi, M., Miotti Bettanini, A., Pezzato, L., Dabalà, M., & Jacques, P. (2021). Effect of Multi-Step Austempering Treatment on the Microstructure and Mechanical Properties of a High Silicon Carbide-Free Bainitic Steel with Bimodal Bainite Distribution. Metals, 11(12), 2055. https://doi.org/10.3390/met11122055 (Original work published 2021)