University of Oulu

Zhou, T., Xiong, Y., Zha, X., Lu, Y., He, T., Ren, F., Rani, E., Singh, H., Kömi, J., Huttula, M. and Cao, W. (2020), Microstructural Evolution Induced Mechanical Property Enhancement in Cryogenically Rolled Ce‐Modified SAF2507 Super Duplex Stainless Steel. Adv. Eng. Mater., 22: 2000516. https://doi.org/10.1002/adem.202000516

Microstructural evolution induced mechanical property enhancement in cryogenically rolled Ce‐modified SAF2507 super duplex stainless steel

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Author: Zhou, Tian1; Xiong, Yi1,2; Zha, Xiao-qin3;
Organizations: 1School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471023 Henan, China
2Collaborative Innovation Center of Nonferrous Metals, Henan University of Science and Technology, Luoyang, 471023 Henan, China
3Luoyang Ship Material Research Institute, China Shipbuilding Industry Group Co., Ltd., Luoyang, 471000 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-fe202102124634
Language: English
Published: John Wiley & Sons, 2020
Publish Date: 2021-08-25
Description:

Abstract

Thermomechanical deformation is one of the most efficient and facile routes to tailor microstructure in structural materials for mechanical property enhancement. Herein, the Ce‐modified SAF2507 super duplex stainless steel (Ce‐SAF2507) is deformed at different levels from 30% to 90% at a cryogenic temperature (–196 °C) to achieve superior mechanical performances. Cryogenic rolling increase fiber texture and induce ultra‐fine grain refinement which brings grains to ≈10 nm in the selected steel. The high‐density dislocations and deformation twins in the cryogenically rolled Ce‐SAF2507 lead to the nucleation and growth of martensite. Increases in the martensite volume fraction and nanoscale grain refinement occur at higher deformation levels. Cryogenically rolled deformation results in the overall increase in the Ce‐SAF2507 hardness. A higher hardness increment of austenite–martensite dual‐phase compared to that of ferrite is attributed to the austenite–martensite‘s higher work hardening ability. Furthermore, the ultimate tensile strength and yield strength increase with the deformation level, but the elongation decrease. Observed microstructural evolutions induced by cryogenic rolling enunciate the superiority of the present method over conventional ones to promote steel’ mechanical properties.

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Series: Advanced engineering materials
ISSN: 1438-1656
ISSN-E: 1527-2648
ISSN-L: 1438-1656
Volume: 22
Issue: 12
Article number: 2000516
DOI: 10.1002/adem.202000516
OADOI: https://oadoi.org/10.1002/adem.202000516
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
216 Materials engineering
Subjects:
Funding: The authors acknowledge the financial supports from the National Natural Science Foundation of China with funding Nos. 51801054 and U1804146, Program for Science, Technology Innovation Talents in Universities of Henan Province with No. 17HASTIT026, Education Department of Henan Province with No. 16A430005, as well as Science and Technology Innovation Team of Henan University of Science and Technology with No. 2015XTD006. The project is also financially supported by the Academy of Finland [No. 311934] and Anhui Provincial Grant for high‐level platform construction.
Academy of Finland Grant Number: 311934
Detailed Information: 311934 (Academy of Finland Funding decision)
Copyright information: © 2020 Wiley‐VCH GmbH. This is the peer reviewed version of the following article: Zhou, T., Xiong, Y., Zha, X., Lu, Y., He, T., Ren, F., Rani, E., Singh, H., Kömi, J., Huttula, M. and Cao, W. (2020), Microstructural Evolution Induced Mechanical Property Enhancement in Cryogenically Rolled Ce‐Modified SAF2507 Super Duplex Stainless Steel. Adv. Eng. Mater., 22: 2000516, which has been published in final form at https://doi.org/10.1002/adem.202000516. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.