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Low-Temperature Toughness of the Austempered Offshore Steel

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Abstract

This study investigates low-temperature toughness of the offshore steel with two different austempering heat treatments. Toughness of upper bainite is significantly lower than that of lower bainite. Low impact toughness of the upper bainite is caused by the presence of martensite–austenite (MA) and increasing the amount of low-angle lath boundaries in upper bainite package. EBSD equipped in the SEM demonstrates an effective approach to analyze the misorientation angle of lath boundaries in upper bainite packet.

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The authors gratefully acknowledge the financial support for this research provided by the Ministry of Science and Technology (MOST), Taiwan, under Grant Number MOST 103-2622-E-006-037 and 104-2622-E-006-001.

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Correspondence to R. K. Shiue.

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Manuscript submitted February 17, 2016.

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Yu, C., Yang, T.C., Huang, C.Y. et al. Low-Temperature Toughness of the Austempered Offshore Steel. Metall Mater Trans A 47, 4777–4783 (2016). https://doi.org/10.1007/s11661-016-3654-9

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