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Effect of the Final Rolling Temperature on the Precipitation Behavior and Toughening Mechanism of Nanoparticles in Ferritic Steel

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Abstract

We have analyzed the effect of the final rolling temperature on the morphology, mechanical properties, carbide nanoparticle size, and dislocation density of Ti-Mo ferritic steel. The microstructure was mainly composed of equiaxed ferrite, ultrafine ferrite, and polygonal deformed ferrite, whose three proportions were affected significantly by the final rolling temperature. The change trend of the mechanical strength was in line with the dislocation density under different finishing rolling temperatures, whereas the ferrite grain size change trend was the opposite. There were various types of nanoparticle precipitation in the test steels: interphase precipitation, dispersion, dislocation precipitation, and deformation-induced precipitation. The optimum mechanical properties were obtained at a final rolling temperature of 900 °C. Quantitative analysis showed that the effect of the final rolling temperature on the yield strength was mainly because of dislocation and precipitation strengthening. The toughening mechanism is attributed to the fine grain strengthening of nanoparticles in austenite stage and the precipitation strengthening of ferrite stage.

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Acknowledgments

The authors thank the National Natural Science Foundation of China (No. 51601174) for financial support. We thank Adam Brotchie, PhD, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.

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Authors and Affiliations

  1. China Electric Power Research Institute, Beijing, 100192, China

    Yao Huang & Junke Han

  2. State Grid Corporation, Beijing, 100031, China

    Weining Liu & Feng Li

  3. University of Science and Technology Beijing, Beijing, 100083, China

    Aimin Zhao

  4. Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China

    Yuhao Liu

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  1. Yao Huang
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Correspondence to Yao Huang.

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Huang, Y., Han, J., Liu, W. et al. Effect of the Final Rolling Temperature on the Precipitation Behavior and Toughening Mechanism of Nanoparticles in Ferritic Steel. J. of Materi Eng and Perform 29, 1724–1731 (2020). https://doi.org/10.1007/s11665-020-04688-y

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