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Metal Science and Heat Treatment

Published in:

01-01-2014

Effect of the Grain Size and Deformation Substructure of Austenite on the Crystal Geometry of Bainite and Martensite in Low-Carbon Steels

Authors: N. Yu. Zolotarevskii, A. A. Zisman, S. N. Panpurin, Yu. F. Titovets, S. A. Golosienko, E. I. Khlusova

Published in: Metal Science and Heat Treatment | Issue 9-10/2014

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Abstract

The effect of deformation in the austenitic temperature range on the features of the crystal geometry of the packet-and-block structure of martensite and bainite after cooling is studied for two low-carbon steels with different levels of microalloying. The distribution of lattice off-orientations in the substructure of the austenite formed by hot deformation of a model austenitic steel SS304 is determined. The effect of the grain size of the austenite and of the cooling rate on the bainite and martensite effective grain sizes is investigated. The results are analyzed.

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Parallelism is obeyed only in the case of the Kurdyumov – Sachs orientation relation (OR), but with some deviation in experimental studies.

We give the values of the angles of off-orientation between the variants computed for the experimentally observed OR.

When we determined these spectra, the boundary was assumed to be close to the CSB if the deviation of the off-orientation on it from the ideal one between variants V1 – V24 did not exceed 1°. This low permissible deviation was chosen in order to avoid getting of some off-orientations into the interval of closeness to more than one CSB, among which their exist off-orientations rather close with respect to the angle and to the axis.

Note that the angles of interblock off-orientations have been computed for a specific orientation relation and can differ somewhat from experimental angles. For example, the maximum in Fig. 6 b corresponding to boundaries V1/V4 is displaced by 6° with respect to the computed value of 5.4°.

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Title: Effect of the Grain Size and Deformation Substructure of Austenite on the Crystal Geometry of Bainite and Martensite in Low-Carbon Steels
Authors: N. Yu. Zolotarevskii
A. A. Zisman
S. N. Panpurin
Yu. F. Titovets
S. A. Golosienko
E. I. Khlusova
Publication date: 01-01-2014
Publisher: Springer US
Published in: Metal Science and Heat Treatment / Issue 9-10/2014
Print ISSN: 0026-0673
Electronic ISSN: 1573-8973
DOI: https://doi.org/10.1007/s11041-014-9668-2

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