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Materials Science and Technology Volume 34, 2018 - Issue 5: Nuclear Materials
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Original Articles

Twins and twin-related domains in a grain boundary-engineered 304 stainless steel

Tingguang LiuNational Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, People’s Republic of China;School of Materials Science and Engineering, Shanghai University, Shanghai, People’s Republic of ChinaCorrespondence[email protected]
ORCID Iconhttp://orcid.org/0000-0002-3253-6817View further author information
ORCID Icon,
Shuang XiaSchool of Materials Science and Engineering, Shanghai University, Shanghai, People’s Republic of ChinaView further author information
,
Xiangkun RuSchool of Materials Science and Engineering, Shanghai University, Shanghai, People’s Republic of ChinaView further author information
,
Qin BaiSchool of Materials Science and Engineering, Shanghai University, Shanghai, People’s Republic of ChinaView further author information
,
Bangxin ZhouSchool of Materials Science and Engineering, Shanghai University, Shanghai, People’s Republic of ChinaView further author information
&
Yonghao LuNational Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, People’s Republic of ChinaView further author information
Pages 561-571 | Received 24 Oct 2017, Accepted 21 Jan 2018, Published online: 05 Feb 2018
 
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ABSTRACT

The grain boundary (GB) network of a GB-engineered 304 stainless steel was investigated in three dimensions. The GB-engineered sample had a high proportion of twin-related boundaries (∼70%). However, these boundaries were not distributed uniformly, but rather in large-sized twin-related domains (TRDs). All grains within a TRD can be connected by a tree-shaped twin-chain. Any two grains within a TRD have ∑3n-type misorientation, where the n-value could be determined according to the twin-chain. These results show that the formation of large-sized TRDs is correlated with extensively progressed multiple-twinning processes. A quadruple-junction has three twin-boundaries at most. Furthermore, all observed quadruple-junctions within TRDs have at least one twin-boundary. The common spatial morphologies of twin-boundaries are plane-shape, tunnel-shape and semi-closed tunnel-shape.

This paper is part of a thematic issue on Nuclear Materials.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the Fundamental Research Funds for the Central Universities [grant number FRF-TP-16-041A1] and National Natural Science Foundation of China [grant number 51701017].

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