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Front. Mater. | doi: 10.3389/fmats.2019.00209

Nucleation and Grain Boundary Evolution in Dynamic Recrystallization of 316LN Steel during Hot Deformation

 Jiachen Liu1* and Huiqin Chen2
  • 1School of Materials Science and Engineering, Taiyuan University of Science and Technology, China
  • 2Taiyuan University of Science and Technology, China

In this work, dynamic recrystallization (DRX) behavior of 316LN austenitic stainless steel was studied by hot compression experiments at temperature range of 900~1200℃ and strain rate range of 0.005~0.5 s−1. The Arrhenius hyperbolic sine function was given to fit well with the hot deformation flow behavior of 316LN steel and the average activation energy (Q) was obtained. The variation of DRX fraction and average grain size was studied and modeled. Microstructural evolution of 316LN steel during hot deformation in condition of 1100℃ and 0.05s-1 was studied by EBSD analysis. It was found that twining plays a significant role in nucleation and growth of DRX during hot deformation. The nucleation of DRX in 316LN steel was characterized by bulging of serrated grain boundaries. Twining took place near the serrated grain boundary in large amount, accelerating the separation of bulging from deformed parent grains to form DRX nucleus. At the steady state strain, uniformly refined DRX grains almost took charge of the microstructure of 316LN steel.

Keywords: dynamic recrystallization, 316LN austenitic stainless steel, hot deformation, nucleation, Twining

Received: 10 Jun 2019; Accepted: 12 Aug 2019.

Copyright: © 2019 Liu and Chen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Jiachen Liu, Taiyuan University of Science and Technology, School of Materials Science and Engineering, Taiyuan, China, 395593109@qq.com