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The Annealing Twins of Fe-20Mn-4Al-0.3C Austenitic Steels during Symmetric and Asymmetric Hot Rolling

1
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
2
CRRC Tangshan Co., Ltd., Tangshan 063035, China
*
Author to whom correspondence should be addressed.
Metals 2018, 8(11), 882; https://doi.org/10.3390/met8110882
Received: 15 October 2018 / Revised: 24 October 2018 / Accepted: 27 October 2018 / Published: 29 October 2018
(This article belongs to the Special Issue Rolling of Metals)
The present work investigates the annealing twins of Fe-20Mn-4Al-0.3C austenitic steels in symmetric hot rolling (SHR) and asymmetric hot rolling (ASHR). The average grain size is 26 (±9.6) μm and 11 (±7.0) μm for the tested steel in SHR and ASHR processes. The density of high angle grain boundary (HAGB) and annealing twin boundary increase with the decrease of grain size. The annealing twin is obviously higher in ASHR than in SHR. The linear relation model between the logarithm of twin boundary density and the logarithm of the grain size is established. The grain boundary migration is continuously generated during recrystallization in SHR process. The coincident site lattice (CSL) boundary proportion increases with local grain boundary continuing bugling and the migration direction of bugling grain boundary constantly changes. The tensile property of the tested steel is improved due to the effective grain refinement and high density of annealing twins caused by the severe strain in the ASHR process. The purpose of high density HAGB for austenitic steels is helpful to an improvement in mechanical properties. View Full-Text
Keywords: rolling; annealing; twin boundary; austenitic steel; grain refinement rolling; annealing; twin boundary; austenitic steel; grain refinement
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MDPI and ACS Style

Li, C.; Ma, B.; Song, Y.; Li, K.; Dong, J. The Annealing Twins of Fe-20Mn-4Al-0.3C Austenitic Steels during Symmetric and Asymmetric Hot Rolling. Metals 2018, 8, 882.

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