EFFECT OF Ce ON THE MICROSTRUCTURE AND PROPERTIES OF 27Cr-4Mo-2Ni SUPER-FERRITIC STAINLESS STEEL WITH 800 °C AGING
Keywords:
cerium, microstructure, properties, ferritic stainless steel
Abstract
The influence of Ce additions on the microstructure and properties of 27Cr-4Mo-2Ni super-ferritic stainless steel during 800 °C aging was systematically investigated via thermodynamic calculations, microstructural characterizations, impact and corrosion measurements. The results indicated that with an increase of Ce content from 0.00 w/% to 0.050 w/%, Al2O3 wrapped by TiNb(CN) were gradually modified into CeAlO3 wrapped by TiNb(CN), spheroidal Ce2O3, and Ce2O2S, the ferrite grain was noticeable refined, the phase changed from continuously distributed with a coarser size to dispersedly distributed with a tiny size accompanied by an increase in number, the impact toughness of super-ferritic stainless was improved at 25 °C, and the cleavage facets at the morphology of a fully brittle fracture becomes smaller, the uniform corrosion resistance of super-ferritic stainless steel to 40 vol.% H2SO4 were enhanced especially at 60 °C.
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[ ] H. P. Qu, Y. P. Lang, et al. The effect of precipitation on microstructure, mechanic properties and corrosion resistance of two UNS S44660 ferritic stainless steels. Materials Science and Engineering: A, 534 (2012) 1, 436-445, DOI:10.1016/j.msea.2011.11.091.
[ ] E. L. Brown, M. E. Burnett, P. T. Purtscher, G. Kraus. Intermetallic phase formation in 25Cr 3Mo 4Ni ferritic stainless steel, Metallurgical and Materials Transactions A, 14 (1983) 4, 791-800, DOI:10.1007/BF02644282.
[ ] P. G. Ng, E. Clarke, C. A. Khoo, G. Fourlaris. Microstructural evolution during aging of novel super ferritic stainless steel produced by the HIP process, Materials Science & Technology, 22 (2006) 7, 852-858, DOI:10.1179/174328406X91140.
[ ] A. F. Padilha, W. Reick, P. F. Cerqueira. A comparative study on the precipitation of the σ phase in a superferritic and in a duplex stainless steel, Z.Metallkd, 92 (2001) 351-354.
[ ] D. M. E. Villanueva, F. C. P. Junior, R. L. Plaut, et al. Comparative study on sigma phase precipitation of three types of stainless steels: austenitic, superferritic and duplex. Materials Science and Technology, 22 (2006) 9,2006, 1098-1104, DOI:10.1179/174328406x109230.
[ ] C. J. Park, M. K. Ahn, H. S. Kwon . Influences of Mo substitution by W on the precipitation kinetics of secondary phases and the associated localized corrosion and embrittlement in 29% Cr ferritic stainless steels, Materials Science and Engineering: A, 418 (2006) 2, 211-217, DOI:10.1016/j.msea.2005.11.053.
[ ] K. Premachandra K, M. B. Cartie MB, R. H. Eric. Effect of stabilising elements on formation of σ phase in experimental ferritic stainless steels containing 39% Cr. Materials Science and Technology,8 (1992) 5, 437-442, DOI:10.1179/026708392790170964.
[ ] C. J. Liu, Y. H. Huang, M. F. Jiang. Effects and mechanisms of RE on impact toughness and fracture toughness of clean heavy rail steel, Journal of Iron & Steel Research International. 18 (2011) 3, 52-58, DOI:10.1016/S1006-706X(11)60037-X.
[ ] S. Zhang, J. Yu, H. Li, et al. Refinement mechanism of cerium addition on solidification structure and sigma phase of super austenitic stainless steel S32654, Materials Science and Technology. 102 (2022)10, 105-114, DOI:10.1016/j.jmst.2021.06.033.
[ ] Q. Wang, L. Wang, Y. Sun, et al. The influence of Ce micro-alloying on the precipitation of intermetallic sigma phase during solidification of super-austenitic stainless steels, Journal of Alloys and Compounds. 815 (2020) 2, 152418-152422, DOI:10.1016/j.jallcom.2019.152418.
[ ] B. L. Bramfitt. The effect of carbide and nitride additions on the heterogeneous nucleation behavior of liquid iron. Metallurgical Transactions. 1 (1970) 7, 1987-1995, DOI:10.1007/BF02642799.
[ ] Y. Li, G. Yang, Z. Jiang, et al. Effects of Ce on the microstructure and properties of 27Cr-3.8Mo-2Ni super-ferritic stainless steels. Ironmaking & Steelmaking, 47 (2018) 1, 1-10, DOI:10.1080/03019233.2018.1538183.
[ ] S. F. Li, Z. J. Zhou, P. H. Wang, et al. Long-term thermal-aging stability of a 16Cr-oxide dispersion strengthened ferritic steel at 973 K, Materials & Design, 90 (2016) 1, 318-329, DOI:10.1016/j.matdes.2015.10.138.
Published
2024-06-03
How to Cite
1.
Yang G, Zhao C, Li D, Liao X, Li Y, Sun S. EFFECT OF Ce ON THE MICROSTRUCTURE AND PROPERTIES OF 27Cr-4Mo-2Ni SUPER-FERRITIC STAINLESS STEEL WITH 800 °C AGING. MatTech [Internet]. 2024Jun.3 [cited 2024Dec.10];58(3):403–411. Available from: https://mater-tehnol.si/index.php/MatTech/article/view/1045
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