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Effect of Mo and V Addition on Microstructure and Mechanical Properties of SA508 Gr.1A Steel for Pipeline in Nuclear Power Plants

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Abstract

To improve the strength and toughness of SA508 Gr.1A steels for application to leak-before-break (LBB) designs of pipelines in nuclear power plants, the effects of adding alloying elements (Mo and V) on the microstructural formation and mechanical properties were analyzed via tensile, Charpy impact, and J–R tests considering ASME code compositions. Four SA508 Gr.1A model alloys with different C, Mo, and V contents were fabricated and their mechanical properties were evaluated. When Mo and V were added to a reference model alloy with a chemical composition identical to that of commercial SA508 Gr.1A steel, the tensile strength increased considerably. The addition of Mo and V suppressed the formation of ferrite and pearlite but promoted the formation of bainite. Nano-sized VC carbides were found to have precipitated inside the grains upon the addition of V. When the C content was decreased by 0.05 wt pct in the steel specimens after the addition of Mo and V, all of the mechanical properties showed remarkable improvements without a loss of strength. Specifically, YS, USE, and JIc increased to more than 100 MPa, 50 J, and 400 kJ/m2 at 559 K (286 °C), respectively, compared to a reference model alloy. Reducing the C content only caused a decrease in cementite, which deteriorated the toughness but did not affect the formation of bainite or the VC precipitates acting as a major strengthening mechanism. The positive effect of the addition Mo and V increased as more Mo and V were added within the range of the ASME Code composition.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2021M2E4A1037978) and by the project “Development of Technologies for Improving Mechanical Properties of Main Steam Piping” funded by KHNP.

Conflict of interest

The authors declare that they have no conflict of interest.

Data Availability

The raw/processed data required to reproduce these findings cannot be shared at this time as the data also form part of an ongoing study.

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Authors and Affiliations

  1. Materials Safety Technology Development Division, Korea Atomic Energy Research Institute, Daejeon, 34057, South Korea

    Seokmin Hong, Se-Mi Hyun, Jong-Min Kim & Min-Chul Kim

  2. Department of Materials Science and Engineering, Korea University, Seoul, 02841, South Korea

    Se-Mi Hyun

  3. Materials Engineering Group, Korea Hydro & Nuclear Power Co. Ltd, Daejeon, 34101, South Korea

    Yo-Seob Lee

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Hong, S., Hyun, SM., Kim, JM. et al. Effect of Mo and V Addition on Microstructure and Mechanical Properties of SA508 Gr.1A Steel for Pipeline in Nuclear Power Plants. Metall Mater Trans A 53, 1499–1511 (2022). https://doi.org/10.1007/s11661-022-06616-2

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