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Three-dimensional study of twin boundaries in conventional and grain boundary-engineered 316L stainless steels

Published online by Cambridge University Press:  15 May 2018

Tingguang Liu
Affiliation:
School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China; and National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China
Shuang Xia*
Affiliation:
School of Materials Science and Engineering, State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China; and Shanghai Xinmin (Dongtai) Duty Forging Co., Ltd., Dongtai 224200, China
Bangxin Zhou
Affiliation:
School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
Qin Bai
Affiliation:
School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
Gregory S. Rohrer
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
*
a)Address all correspondence to this author. e-mail: xs@shu.edu.cn, xiashuang14@sohu.com
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Abstract

The three-dimensional microstructures of two conventional 316L stainless steels and a grain boundary (GB)-engineered version of the same steel have been characterized by using serial sectioning and electron backscatter diffraction mapping. The morphologies, area fractions, and number fractions of twin boundaries (TBs) were measured and compared, and the random boundary connectivity was evaluated. Although two-dimensional observations suggest that TBs are planar, occluded twin-grains and tunnel-shaped TBs were also observed. In addition, some large and morphologically complex TBs were observed in the GB-engineered sample, and these TBs were responsible for the increase in the twin area fraction that has been reported in past studies. While GB engineering increased the boundary area fraction, the TB number fraction was almost unchanged. Because the GB engineering process changed only the area fraction and not the number fraction, the connectivity of random boundaries was not disrupted.

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Article
Copyright
Copyright © Materials Research Society 2018 

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