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Effect of Intercritical Annealing Temperature on Martensite and Bainite Start Temperatures After Partial Austenitization

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Abstract

The microstructure evolution of dual-phase steel during partial austenitization was investigated for different intercritical annealing temperatures between Ac1 and Ac3 temperatures. Partial austenitization may result in different austenite volume fraction, chemical composition, and grain size of austenite depending on the intercritical annealing temperature. This study examines the effect of intercritical annealing temperature on M s and B s temperatures for dual-phase steels. M s and B s were measured experimentally for different intercritical annealing temperatures by using dilatometry and were compared with calculated values from empirical formulas. The grain sizes of the final microstructures were also quantitatively analyzed. It was shown that M s depends on the intercritical annealing temperature and austenite grain size. It was concluded that this double effect is attributed to the intercritical annealing temperature, which is responsible for both austenite chemical composition and grain size.

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Acknowledgements

This research was financially supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) under research Project Number 212M008 and by the Kocaeli University Science Research Foundations under research project number 2014/026. The authors thank Yapı-Tek Çelik Sanayi A.Ş., Kocaeli, Turkey, for providing materials. They are also grateful to Dr. U. Prahl, RWTH Aachen, for access to a precision dilatometer and to Dr. M. Sezen, Sabancı University, Istanbul, Turkey, for access to a FEG-SEM.

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  1. Department of Metallurgical and Materials Engineering, Kocaeli University, 41380, Kocaeli, Turkey

    Ersoy Erişir & Oğuz Gürkan Bilir

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  1. Ersoy Erişir
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  2. Oğuz Gürkan Bilir
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Correspondence to Ersoy Erişir.

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Erişir, E., Bilir, O.G. Effect of Intercritical Annealing Temperature on Martensite and Bainite Start Temperatures After Partial Austenitization. JOM 68, 203–209 (2016). https://doi.org/10.1007/s11837-015-1673-4

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  • DOI: https://doi.org/10.1007/s11837-015-1673-4

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