Effect of Deformation Strengthening and Phase Reversion Grain Refinement Strengthening on Corrosion Resistance of Fe-18Cr-8Ni Steel

doi:10.11902/1005.4537.2023.093

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (2): 429-436 DOI: 10.11902/1005.4537.2023.093

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Effect of Deformation Strengthening and Phase Reversion Grain Refinement Strengthening on Corrosion Resistance of Fe-18Cr-8Ni Steel

WANG Zhihui¹, WU Lei¹, JIANG Yishan²(

), ZHANG Xian¹, WAN Xiangliang¹, LI Guangqiang¹, WU Kaiming¹^,³

^1.Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
^2.Academy of Green Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
^3.Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan 430081, China

Cite this article:

WANG Zhihui, WU Lei, JIANG Yishan, ZHANG Xian, WAN Xiangliang, LI Guangqiang, WU Kaiming. Effect of Deformation Strengthening and Phase Reversion Grain Refinement Strengthening on Corrosion Resistance of Fe-18Cr-8Ni Steel. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 429-436.

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Abstract

Cold rolling and reverse phase transformation are the main methods to enhance the yield strength of austenitic stainless steel. Therefore, the effect of deformation strengthening and grain refinement strengthening on the microstructure and corrosion behavior of Fe-18Cr-8Ni austenitic stainless steel was characterized by SEM, TEM, EBSD, electrochemical workstation and other technical characterization means. The results show that the deformation strengthening and the inverse phase transformation induced grain refinement strengthening could enhance the pitting resistance of austenitic stainless steel in 3.5%NaCl solution, grain refinement led to an increase in grain boundary density, which promote the diffusion rate of Cr at grain boundaries, thereby improving the stability and compactness of the passivation film. After sensitization treatment, deformation strengthening and inverse phase transformation induced grain refinement strengthening could enhance the intergranular corrosion resistance of austenitic stainless steel. The appearance of Cr-depletion zone around chromium carbide precipitates will deteriorate the intergranular corrosion resistance of the steel, while the rapid diffusion of Cr in ultrafine grain/fine grain structure will promoted the rapid healing of the passivation film on the Cr-depletion zone, thus the intergranular corrosion resistance of the steel may be improved.

Key words: austenitic stainless steel deformation strengthening fine grained strengthening intergranular corrosion

Received: 27 March 2023 32134.14.1005.4537.2023.093

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(U20A20277);Guangxi Science and Technology Major Special Project(AA22068080)

Corresponding Authors: JIANG Yishan, E-mail: jiangyishan@wust.edu.cn

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	WANG Zhihui
	WU Lei
	JIANG Yishan
	ZHANG Xian
	WAN Xiangliang
	LI Guangqiang
	WU Kaiming

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.093 OR https://www.jcscp.org/EN/Y2024/V44/I2/429

Fig.1 Microstructures of original sample (a), CR sample (b) and UFG/FG sample (c)

Fig.2 TEM morphologies of original sample (a, d), CR sample (b, e) and UFG/FG sample (c, f)

Fig.3 EBSD diagrams (a-c) and grain size distribution images (d-f) of original sample (a, d), CR sample (b, e) and UFG/FG sample (c, f)

Fig.4 Potentiodynamic polarization curves of three steels in 3.5%NaCl solution

Table 1 Pitting potential (E_pit), corrosion potensial (E_corr) and corrosion current density (I_corr) of three steels in 3.5%NaCl solution

Fig.5 SEM microstructure of original sample (a, d), CR sample (b, e) and UFG/FG sample (c, f) after sensitization treatment

Fig.6 Potentiodynamic polarization curve (a) and reactivation curve (b) of three steels in saturated CuSO₄ solution

Table 2 Grain size and corrosion resistance of three steels

Fig.7 Pitting potential -grain size curve (a) and reactivation rate-grain size curve (b) of three steels

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