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Materials 2017, 10(5), 453; doi:10.3390/ma10050453

Investigation of Parent Austenite Grains from Martensite Structure Using EBSD in a Wear Resistant Steel

1
Materials Science Division, Dalarna University, 791 88 Falun, Sweden
2
Research and Development, SSAB Europe, 781 84 Borlänge, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Richard Thackray
Received: 28 March 2017 / Revised: 12 April 2017 / Accepted: 20 April 2017 / Published: 26 April 2017
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Abstract

Crystallographic reconstruction of parent austenite grain boundaries from the martensitic microstructure in a wear resistant steel was carried out using electron backscattered diffraction (EBSD). The present study mainly aims to investigate the parent austenite grains from the martensitic structure in an as-rolled (reference) steel sample and samples obtained by quenching at different cooling rates with corresponding dilatometry. Subsequently, this study is to correlate the nearest cooling rate by the dilatometer which yields a similar orientation relationship and substructure as the reference sample. The Kurdjumov-Sachs orientation relationship was used to reconstruct the parent austenite grain boundaries from the martensite boundaries in both reference and dilatometric samples using EBSD crystallographic data. The parent austenite grain boundaries were successfully evaluated from the EBSD data and the corresponding grain sizes were measured. The parent austenite grain boundaries of the reference sample match the sample quenched at 100 °C/s (CR100). Also the martensite substructures and crystallographic textures are similar in these two samples. The results from hardness measurements show that the reference sample exhibits higher hardness than the CR100 sample due to the presence of carbides in the reference sample. View Full-Text
Keywords: dilatometry; hardness; EBSD; martensite; austenite; Kurdjumov-Sachs dilatometry; hardness; EBSD; martensite; austenite; Kurdjumov-Sachs
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gyhlesten Back, J.; Engberg, G. Investigation of Parent Austenite Grains from Martensite Structure Using EBSD in a Wear Resistant Steel. Materials 2017, 10, 453.

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