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Crystals 2015, 5(4), 592-607; doi:10.3390/cryst5040592

Influence of Boron on Initial Austenite Grain Size and Hot Deformation Behavior of Boron Microalloyed Steels

Liaoning Key Laboratories of Ecological Utilization Technology of Boron Resources and Boron Materials, Northeastern University, Shenyang 110819, China
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Author to whom correspondence should be addressed.
Academic Editors: Umit B. Demirci, Philippe Miele and Pascal G. Yot
Received: 11 October 2015 / Accepted: 16 November 2015 / Published: 24 November 2015
(This article belongs to the Special Issue Boron-Based (Nano-)Materials: Fundamentals and Applications)
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Abstract

The initial austenite grain size of boron microalloyed steel with three different amounts of boron (20, 40, and 60 ppm) was investigated under different heating temperatures (1150, 1100, and 1050 °C), and hot compression tests of samples in a wide range of temperature (900–1100 °C) and strain rate (0.1–10 s−1) were conducted. It was found that the initial austenite grain size increases with increasing temperature and boron content. The flow stress decreased with increasing boron content at lower strain rates. The flow stress constitutive equation of hot deformation was developed for the experimental steels; results showed that boron addition has the trend to reduce the hot deformation activation energy. The characteristic points of the flow curves were analyzed. Results revealed that the peak and critical stress decreased in response to an increase of boron content. The work-hardening behavior of both steels was investigated, and it was found that boron addition can decrease the work-hardening rate when strained at lower strain rates. On the contrary, peak and critical strains increased as boron content increased, indicating that boron has the ability to delay the onset of dynamic recrystallization. View Full-Text
Keywords: boron-tread steels; initial austenite grain; hot deformation; constitutive equation; dynamic recrystallization boron-tread steels; initial austenite grain; hot deformation; constitutive equation; dynamic recrystallization
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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Gao, Y.-L.; Xue, X.-X.; Yang, H. Influence of Boron on Initial Austenite Grain Size and Hot Deformation Behavior of Boron Microalloyed Steels. Crystals 2015, 5, 592-607.

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