Searched for: subject%3A%22steel%22
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Nutter, John (author), Qi, Jiahui (author), Farahani, H. (author), Rainforth, W. Mark (author), van der Zwaag, S. (author)
The current study reports in situ TEM observations of the growth of bainitic ferrite in an Fe-0.3C-3Mn-1.5Si-0.15Mo steel held isothermally at 300 °C with a higher spatio-temporal resolution than in previous studies. Significant variations were found in the lengthening rate, with the highest being in excess of 30,000 nm.s<sup>−1</sup> while...
journal article 2023
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Abraham Mathews, J. (author), Farahani, H. (author), Sietsma, J. (author), Petrov, R.H. (author), Mecozzi, M.G. (author), Santofimia, Maria Jesus (author)
The influence of carbon concentration variations on pearlite formation (20 h at 600 °C) in a case-carburized steel is investigated. The resultant microstructure shows three distinct regions: carburized case, a transition region, and the original core. The microstructural transition from the case to the core regions is observed to be...
journal article 2023
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Hidalgo Garcia, J. (author), Vittorietti, M. (author), Farahani, H. (author), Vercruysse, F. (author), Petrov, R.H. (author), Sietsma, J. (author)
Understanding the local strain enhancement and lattice distortion resulting from different microstructure features in metal alloys is crucial in many engineering processes. The development of heterogeneous strain not only plays an important role in the work hardening of the material but also in other processes such as recrystallization and...
journal article 2020
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Farahani, H. (author), Zijlstra, Gerrit (author), Mecozzi, M.G. (author), Ocelík, Václav (author), De Hosson, Jeff Th M. (author), van der Zwaag, S. (author)
In this research, in situ high-temperature electron backscattered diffraction (EBSD) mapping is applied to record and analyze the migration of the α/3 interfaces during cyclic austenite-ferrite phase transformations in a medium manganese steel. The experimental study is supplemented with related 3D phase field (PF) simulations to better...
journal article 2019
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Nutter, J. (author), Farahani, H. (author), Rainforth, W. M. (author), van der Zwaag, S. (author)
The kinetic behaviour of austenite/ferrite interfaces in a low carbon – 0.5 mass% Mn containing steel during Cyclic Partial Phase Transformation (CPPT) experiments has been investigated using hot stage Transmission Electron Microscopy (TEM). Individual interfaces were observed to display behaviour typical of CPPT experiments as recorded in...
journal article 2019
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Farahani, H. (author)
Steels are still, and probably will remain in future, the primary choice for applications as structural materials. This is not only because of the reasonable ratios of properties over production costs, but also owing to the versatile properties realisable via variety of microstructures achieved by controlling the solid-state phase...
doctoral thesis 2018
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Farahani, H. (author), Xu, W. (author), van der Zwaag, S. (author)
Predicting the effect of alloying elements on the degree of incomplete austenite to bainite transformation in low carbon steels is of great industrial importance. This study introduces an extended Gibbs energy balance model which makes use of an additive approach to calculate the coupled effect of Mn, Si and Mo on the fraction of bainitic...
journal article 2018
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Sainis, Salil (author), Farahani, H. (author), Gamsjäger, Ernst (author), van der Zwaag, S. (author)
Direct microscopic observation of the isothermal bainite evolution in terms of nucleation events, the location of the nuclei, as well as their growth is very valuable for the refinement of models predicting the kinetics of bainite transformation. To this aim, the microstructural evolution in a Fe-0.2C-1.5Mn-2.0Cr alloy during isothermal...
journal article 2018
Searched for: subject%3A%22steel%22
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