Precipitation of Second Phase and Its Effect on Corrosion Resistance of Ce-containing S31254 Super Austenitic Stainless Steel

doi:10.11902/1005.4537.2022.135

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 384-390 DOI: 10.11902/1005.4537.2022.135

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Precipitation of Second Phase and Its Effect on Corrosion Resistance of Ce-containing S31254 Super Austenitic Stainless Steel

ZHANG Xiaoli, XUN Maonian, LIANG Xiaohong, ZHANG Caili, HAN Peide(

)

College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

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Abstract

The dissolution and precipitation behavior of the second phase and corrosion resistance of S31254-Ce super austenitic stainless steel after solid solution and aging treatment were studied by scanning electron microscope (SEM) and electrochemical test. The results show that the precipitates in S31254-Ce stainless steel can be completely redissolved after heated at 1250 ℃ for 120 min. After aged at 800-900 ℃, particulates of second phase were precipitated in S31254-Ce stainless steel preferentially along grain boundaries. With the increase of aging temperature up to above 840 ℃, the particulates gradually precipitated within the grain, and the number of precipitates gradually increases. During the aging treatment at 860 ℃, with the extension of aging time, the size of the fine dot-like precipitates within the grain gradually increased, and the intragranular precipitates gradually formed a network-like morphology. S31254-Ce has the best corrosion resistance after solid solution treatment. With the increased of aging temperature, the number of precipitates of S31254-Ce stainless steel increased and therewith the corrosion resistance of the steel decreased. After aging at 840-900 ℃, the degree of the corrosion resistance deterioration of S31254-Ce stainless steel increased.

Key words: S31254 stainless steel Ce aging treatment precipitate corrosion resistance

Received: 05 May 2022 32134.14.1005.4537.2022.135

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51871159)

About author: HAN Peide, E-mail: hanpeide@tyut.edu.cn

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Cite this article:

ZHANG Xiaoli, XUN Maonian, LIANG Xiaohong, ZHANG Caili, HAN Peide. Precipitation of Second Phase and Its Effect on Corrosion Resistance of Ce-containing S31254 Super Austenitic Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 384-390.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.135 OR https://www.jcscp.org/EN/Y2023/V43/I2/384

Fig.1 As rolled microstructure of S31254-Ce stainless steel: (a) low image, (b) high image

Fig.2 Microstructure of S31254-Ce stainless steel after solution treatment at 1250 ℃ for 60 min (a), 120 min (b) and 180 min (c)

Fig.3 Microstructure of S31254-Ce stainless steel treated at 800 ℃ (a), 820 ℃ (b), 840 ℃ (c), 860 ℃ (d), 880 ℃ (e) and 900 ℃ (f) aging temperatures for 90 min

Fig.4 Microstructure of S31254-Ce stainless steel treated at 860 ℃ for 30 min (a), 60 min (b), 90 min (c) and 120 min (d)

Fig.5 Morphology (a) and EDS analysis (b, c) of S31254-Ce stainless steel aged at 860 ℃ for 120 min

Fig.6 Potentiodynamic polarization curves (a) and I_corr value change of S31254-Ce stainless steel solution treated and aged at different aging temperatures for 90 min (b)

Table 1 Electrochemical parameters of potentiodynamic polarization for S31254-Ce stainless steel solution treated and aged at different aging temperatures for 90 min

Fig.7 Nyquist (a) and Bode (b) plots and EIS equivalent circuit diagram (c) of S31254-Ce stainless steelsolution treated and aged at different aging temperatures for 90 min

Table 2 Equivalent circuit fitting results of S31254-Ce stainless steel treated at different aging temperatures for 90 min

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