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- Title
Mechanical Properties of Step-Austempered Nanostructured Bainitic Steel with Modified Chemical Composition at Low and High Strain Rates.
- Authors
Hosseinzadeh Khanmiri, Mehdi; Charchi Aghdam, Majid; Mousalou, Hamid; Avishan, Behzad; Yazdani, Sasan
- Abstract
This article investigates the strength and ductility properties of a low-alloy steel with a carbon content of 0.32 wt.% after performing one-, two- and three-step austempering processes. Dilatometry tests were used to extract the mandatory data for heat treatment process design, and FE-SEM and XRD were used to evaluate the microstructural characteristics of the heat-treated materials. Quasi-static tensile tests and high strain rate Hopkinson tests were performed to evaluate the strength-ductility combinations. The results showed that step-austempering procedures ended in microstructural features such as nanoscale bainitic ferrites and austenite films in bainitic sheaves separated by austenite microblocks. The size and morphology of the microstructural constituents were comparable to those of ordinary nanostructured high-carbon bainitic steels after one-step isothermal bainitic heat treatment. In addition, it was confirmed that a significant improvement in mechanical properties could be achieved by changing the chemical composition. Finally, the strength values obtained at very high strain rates were comparable to those of ordinary nanostructured bainitic steels with high carbon content obtained by a one-step isothermal heat treatment process.
- Subjects
BAINITIC steel; STRAIN rate; LOW alloy steel; HEAT treatment; CARBON steel
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2023, Vol 75, Issue 9, p3911
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-06005-z