Abstract
The precipitate phases of a 11Cr F/M steel normalized at 1323 K (1050 °C) for 0.5 h and tempered for 1.5 h at temperatures ranging from 573 K to 1053 K (300 °C to 780 °C) were investigated using transmission electron microscopy and energy-dispersive X-ray spectroscopy. In the normalized condition, Fe-rich M3C, Fe-rich M7C3, and large MC carbides were identified in the steel. In the relatively low tempering temperature ranging from 573 K to 773 K (300 °C to 500 °C), Fe-rich M2C, Fe-rich M3C, and large-sized Nb-rich MC carbides were observed in the steel. In the high tempering temperature ranging from 873 K to 1053 K (600 °C to 780 °C), Cr-rich M2C, Cr-rich M3C2, Cr-rich M23C6, and Fe-rich M5C2 carbides and MX particles including Nb-rich, Ta-Nb-rich, and V-rich MC carbides were detected in steel besides large MX particles. The process of precipitate phase evolution in the steel during tempering is discussed.
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Acknowledgments
This work was supported by the Key Program of the National Natural Science Foundation of China (51034011), the National Magnetic Confinement Fusion Program of The Department of Science and Technology of China (2011GB113001), and the Shanghai Pujiang Program. The authors thank Prof. Aidang Shan from Shanghai Jiao Tong University for supplying the experimental steel plate.
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Manuscript submitted December 29, 2017.
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Xu, Z., Shen, Y. Precipitate Phase Evolution in a 11Cr Ferritic/Martensitic Steel During Tempering. Metall Mater Trans A 49, 3486–3500 (2018). https://doi.org/10.1007/s11661-018-4668-2
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DOI: https://doi.org/10.1007/s11661-018-4668-2