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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.
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Received: 05 May 2022
32134.14.1005.4537.2022.135
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Fund: National Natural Science Foundation of China(51871159) |
About author: HAN Peide, E-mail: hanpeide@tyut.edu.cn
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