Abstract
In this study, tensile behavior of Nb-containing 25Cr–20Ni austenitic stainless steels composed of coarse or fine grains has been investigated at temperatures ranging from room temperature to 900 °C. Results show that the tensile strength of fine-grained specimens decreases faster than that of coarse-grained specimens, as the test temperature increases from 600 °C to 800 °C. The rapidly decreasing tensile strength is attributed to the enhanced dynamic recovery and recrystallization, because additional slip systems are activated, and cross-slipping is accelerated during deformation in fine-grained specimens. After tensile testing at 700–900 °C, sigma phases are formed concurrently with dynamic recrystallization in fine-grained specimens. The precipitation of sigma phases is induced by simultaneous recrystallization as the diffusion of alloying elements is accelerated during the recrystallization process. Additionally, the minimum ductility is observed in coarse-grained specimens at 800 °C, which is caused by the formation of M23C6 precipitates at the grain boundaries.
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Acknowledgements
This work was financially supported by the Youth Innovation Promotion Association, Chinese Academy of Sciences (No. 2013126), the LiaoNing Revitalization Talents Program under (No. XLYC1807022), the Guangdong Innovative and Entrepreneurial Research Team Program (No. 2016ZT06G025), and the Guangdong Basic and Applied Basic Research Foundation (No. 2019A1515110886). We thank Editage Company for English language editing. We also thank Dr. Sanjooram Paddea and Dr. Rengen Ding in CEAM for the suggestions on the writing.
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Hu, G., Wang, P., Li, D. et al. High-temperature Tensile Behavior in Coarse-grained and Fine-grained Nb-containing 25Cr–20Ni Austenitic Stainless Steel. Acta Metall. Sin. (Engl. Lett.) 33, 1455–1465 (2020). https://doi.org/10.1007/s40195-020-01076-2
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DOI: https://doi.org/10.1007/s40195-020-01076-2