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Strength of Materials

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13-08-2019

Effects of Undercooling and Transformation Time on Microstructure and Strength of Fe–C–Mn–Si Superbainitic Steel

Authors: J. Y. Tian, G. Xu, H. J. Hu, M. X. Zhou

Published in: Strength of Materials | Issue 3/2019

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Abstract

A metallographic method, dilatometry, and X-ray diffraction were applied to investigate the effects of undercooling and holding time on bainitic transformation, microstructure, and strength of Fe–C–Mn–Si superbainitic steel. The results indicate that the strength of the samples decreases and the elongation increases with the isothermal transformation time, resulting in an increase in the product of the tensile strength and the total elongation. Therefore, the prolongation of the transformation time can improve the comprehensive property of the sample. In addition, the morphology of bainite changes from granular bainite to lath-like one with a decline in the isothermal transformation temperature, leading to an increase in strength. The elongation first increases and then decreases with a decrease in the isothermal transformation temperature. Finally, the sample shows the best comprehensive property when it is austempered at an intermediate temperature (350°C). The data presented here are instrumental in optimizing the technology of austempering treatment in industrial production.

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Title: Effects of Undercooling and Transformation Time on Microstructure and Strength of Fe–C–Mn–Si Superbainitic Steel
Authors: J. Y. Tian
G. Xu
H. J. Hu
M. X. Zhou
Publication date: 13-08-2019
Publisher: Springer US
Published in: Strength of Materials / Issue 3/2019
Print ISSN: 0039-2316
Electronic ISSN: 1573-9325
DOI: https://doi.org/10.1007/s11223-019-00090-9

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