University of Oulu

Tian Zhou, Yi Xiong, Yun Yue, Yan Lu, Yan-na Chen, Tian-tian He, Feng-zhang Ren, Harishchandra Singh, Jukka Kömi, Marko Huttula, Wei Cao, Controlled cold rolling effect on microstructure and mechanical properties of Ce-modified SAF 2507 super duplex stainless steel, Materials Science and Engineering: A, Volume 766, 2019, 138352, ISSN 0921-5093, https://doi.org/10.1016/j.msea.2019.138352

Controlled cold rolling effect on microstructure and mechanical properties of Ce-modified SAF 2507 super duplex stainless steel

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Author: Zhou, Tian1; Xiong, Yi1,2; Yue, Yun3;
Organizations: 1School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471023, Henan, China
2Collaborative Innovation Center of Nonferrous Metals, Luoyang, 471023, Henan, China
3National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang, 471023, Henan, China
4Nano and Molecular Systems Research Unit, University of Oulu, FIN-90014, Finland
5Materials and Mechanical Engineering, Center for Advanced Steels Research, University of Oulu, FIN-90014, Finland
6School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2020060841092
Language: English
Published: Elsevier, 2019
Publish Date: 2021-08-30
Description:

Abstract

Controlled cold rolling impacts on microstructure and mechanical properties of the rare earth Ce-modified SAF 2507 super duplex stainless steel (SDSS) are investigated towards a better application and development prospective over the pristine SDSS. Rolling was performed at room temperature with the deformation level in a range of 30%–90%. A large amount of dislocations into the ferrite phase turned out, and their density increased with the deformation. While, emergence of dislocation plugs group, ferrite grains get refined to nanometer scale during the deformation process. In addition to deformed bands within austenite, formation of α′-martensitic phases and significant increment in their volume fraction are detected and attributed to deformation-induced martensitic transformation. Elongation of the ferrite and austenite microstructures along the deformation direction under the action of high strain also resulted in fibers formation gradually. Correspondingly, significant increase in the strength index while decrement in the plasticity index are observed. Moreover, cold rolling deformation not only affects the tensile fracture morphology but also switches it from a typical ductile to a ductile and quasi-cleavage mixed fracture.

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Series: Materials science & engineering. A, Structural materials: properties, microstructure and processing
ISSN: 0921-5093
ISSN-E: 1873-4936
ISSN-L: 0921-5093
Volume: 766
Article number: 138352
DOI: 10.1016/j.msea.2019.138352
OADOI: https://oadoi.org/10.1016/j.msea.2019.138352
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: This work is supported by the National Natural Science Foundation of China under grants Nos. U1804146 and 51801054, and by the Program for Science, Technology Innovation Talents in Universities of Henan Province (17HASTIT026), Education Department of Henan Province (16A430005) and the Science and Technology Innovation Team of Henan University of Science and Technology (2015XTD006). Financial supports from the Academy of Finland [311934] and Anhui Provincial Grant for high-level platform construction are also acknowledged.
Copyright information: © 2019 Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
  https://creativecommons.org/licenses/by-nc-nd/4.0/