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Open AccessArticle

Observations on the Relationship between Crystal Orientation and the Level of Auto-Tempering in an As-Quenched Martensitic Steel

1
Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, 90014 Oulun Yliopisto, Finland
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Outotec Research Center, Outotec Oy, Kuparitie 10, P.O. Box 69, FI-28101 Pori, Finland
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Kerttu Saalasti Institute, University of Oulu, Pajatie 5, FI-85500 Nivala, Finland
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Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
*
Author to whom correspondence should be addressed.
Metals 2019, 9(12), 1255; https://doi.org/10.3390/met9121255
Received: 7 October 2019 / Revised: 19 November 2019 / Accepted: 21 November 2019 / Published: 24 November 2019
Auto-tempering is a feature of the technologically important as-quenched low-carbon martensitic steels. The focus of this paper is on the morphology of the martensite and the orientation of the last forming untempered regions in relation to the earlier formed auto-tempered martensite in both small and large austenite grains. A low-carbon martensitic steel plate was austenitized for 24 h and quenched to room temperature. The resulting microstructure was characterized using electron microscopy and electron back scattered diffraction (EBSD) imaging. It was found that all the untempered regions in the martensitic microstructure were oriented with the plane normals {100} close to the thickness, or normal, direction of the plates. Variant analysis revealed that the untempered regions and the auto-tempered regions are part of the same packet. View Full-Text
Keywords: martensite; auto-tempering; EBSD; untempered; variants; orientation martensite; auto-tempering; EBSD; untempered; variants; orientation
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Ramesh Babu, S.; Nyyssönen, T.; Jaskari, M.; Järvenpää, A.; Davis, T.P.; Pallaspuro, S.; Kömi, J.; Porter, D. Observations on the Relationship between Crystal Orientation and the Level of Auto-Tempering in an As-Quenched Martensitic Steel. Metals 2019, 9, 1255.

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