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Processing maps and microstructural evolution of the type 347H austenitic heat-resistant stainless steel

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Abstract

To study the thermal deformation behavior and microstructural evolution of the type 347H austenitic steel, compression experiments were conducted at the temperatures of 800–1100 °C with strain rates of 0.01–10 s−1. The activation energy and constitutive equation of the type 347H steel during thermal deformation process were determined according to the flow stress curves. Both the hot processing maps and microstructure characteristics under different deformation conditions were investigated. Based on the thermal processing maps, two unstable regions under 800 °C/0.01–10 s−1 and 1100 °C/0.01 s−1 were identified. The processing maps were in favor of optimizing thermal processing parameters and improving thermal processing properties of the type 347H austenitic steel. After thermal deformation, the dislocation in the austenite matrix increases significantly. Besides, in the stable regions, the precipitation of carbides is facilitated by thermal deformation.

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ACKNOWLEDGMENTS

The authors are grateful to the China National Funds for Distinguished Young Scientists (Grant No. 51325401), the International Thermonuclear Experimental Reactor (ITER) Program Special Project (Grant No. 2014GB125006), the National High Technology Research and Development Program (“863”Program) of China (Granted No. 2015AA042504), the National Natural Science Foundation of China (Grant No. 51474156), and the Natural Science Foundation of Tianjin City (Grant No. 12JCYBJC11800) for grant and financial support.

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Authors and Affiliations

  1. State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin, 300072, People’s Republic of China

    Yinghui Zhou, Yongchang Liu, Xiaosheng Zhou, Chenxi Liu, Liming Yu & Chong Li

  2. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, People’s Republic of China

    Baoqun Ning

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  1. Yinghui Zhou
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  2. Yongchang Liu
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  3. Xiaosheng Zhou
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  4. Chenxi Liu
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  5. Liming Yu
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  7. Baoqun Ning
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Correspondence to Yongchang Liu.

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Zhou, Y., Liu, Y., Zhou, X. et al. Processing maps and microstructural evolution of the type 347H austenitic heat-resistant stainless steel. Journal of Materials Research 30, 2090–2100 (2015). https://doi.org/10.1557/jmr.2015.168

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