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Microstructural Assessment of Nanobainite Formed in a Chemically Heterogeneous High-Carbon Al-Si Alloyed Steel

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Abstract:

A chemically heterogeneous Fe-0.95C-1.8Si-1.5Mn-0.65Cr-0.34Mo-0.6Al-1.51Cowt.% steel was isothermally heat treated in the temperature range of 200-250 to produce nanostructured bainite. Observations using optical microscopy and field emission scanning electron microscopy revealed that the microstructures consisted of nanosized bainitic ferrite plates in a matrix of retained austenite, which was confirmed by X-ray diffraction analysis. The influence of chemical heterogeneity on the development of nanobainite structure was also examined. It was found that the ferritic constituent nucleates preferentially in the substitutional-solute-lean regions, leaving coarse blocks of untransformed austenite in the substitutional-solute-rich regions. A yield strength of 165511MPa and an ultimate tensile strength of 194121MPa were obtained after isothermal transformation at 250 for 16h while the ductility of the material was 40.8%. This low ductility was attributed to the instability of large regions of austenite retained untransformed in the substitutional-solute-rich regions. An unexpectedly high hardness of 800HV30 was obtained following transformation at 200 for 44h.

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Journal of Metastable and Nanocrystalline Materials Vol. 34

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Journal of Metastable and Nanocrystalline Materials (Volume 34)

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https://doi.org/10.4028/p-C6mbeN

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July 2022

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Sadjad Baradari*, Seyed Mohammad Ali Boutorabi

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Chemical Heterogeneity, Nanostructured Bainitic Steel, Phase Transformation, Retained Austenite

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