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Effect of Initial Microstructure on Mechanical Properties of Pressure Vessel Steel after Intercritical Heat Treatment

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Metal Science and Heat Treatment Aims and scope

The influence of the initial structure on formation of austenite, evolution of structure, and elevation of operating characteristics of steel SA508 Gr.3 (0.24% C, 1.40% Mn, 0.88% Ni, 0.54% Mo) after an intercritical heat treatment (IHT) is studied. After the IHT, the grain size of the hypoeutectoid ferrite in the steel with an initially ferritic-bainitic structure is much larger than in the initially bainitic or martensitic structures. The density of the low-angle and high-angle boundaries is much higher in the steel with initial bainitic or martensitic microstructure. The initial microstructure affects substantially the strength and the impact toughness of the steel subjected to IHT. The mechanical properties are increased as a result of refinement of the microstructure and growth of the density of grain boundaries.

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Authors and Affiliations

  1. School of Construction Machinery, Shandong Jiao Tong University, Jinan, Shandong, China

    Guanghua Yan

  2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China

    Yanle Sun

  3. Institute of Materials Modification and Modeling, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China

    Jianfeng Gu & Chuanwei Li

Authors
  1. Guanghua Yan
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  2. Yanle Sun
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  3. Jianfeng Gu
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  4. Chuanwei Li
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Correspondence to Guanghua Yan.

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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 10 – 19, February, 2021.

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Yan, G., Sun, Y., Gu, J. et al. Effect of Initial Microstructure on Mechanical Properties of Pressure Vessel Steel after Intercritical Heat Treatment. Met Sci Heat Treat 63, 70–79 (2021). https://doi.org/10.1007/s11041-021-00649-x

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  • DOI: https://doi.org/10.1007/s11041-021-00649-x

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