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Effect of multiple passes on Lüders/yield plateaus, microstructure and tensile behaviour of narrow-gap thick-section weld plates

  • Metals & corrosion
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Abstract

During nuclear reactor pressure vessel manufacturing, conventional arc welding processes are often employed involving multiple passes to join thick sections. Such thick-section welding may cause variable through-thickness metallurgical and mechanical properties due to variable heat input, particularly in the heat-affected zone (HAZ) and weld metal. Structural steels for pressure vessel components can be selected based on properties such as the Lüders plateau and yield/tensile (YS/UTS) ratio in order to assure extended service lives. In the present work, through-thickness tensile properties of narrow-gap (NG) welds performed on 78-mm-thick SA533 plate welded according to ASME IX with 58 passes of gas tungsten arc welding (NG-GTAW) and 38 passes of narrow-gap submerged arc welding (NG-SAW) are examined and compared. The Lüders plateau strength, length and velocity were determined along with yield, YS/UTS ratio, ultimate tensile strength and elongation. These properties were analysed in connection with metallurgical and microstructural properties for both welding approaches and established the correlation among them in both cases with the mechanical properties and Lüder behaviour. Multiple thermal cycles have tempered and refined the microstructure and hardness in weld and HAZ, which pretends to be a heat treatment of weldment and promotes the formation of Lüders plateau. The YS/UTS ratio and Lüders plateau behaviour has been evidenced to be influenced by large numbers of thermal cycles. Additionally, the heat input is also vital concern as it is observed that the Lüders plateau stress is more in GTAW process than the SAW. However, Lüders plateau length is significant in SAW than GTAW process. The implication of these variations on structural integrity aspects and the correlation of mechanical-microstructural properties have been justified in the present work.

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Acknowledgements

The authors would like to acknowledge the Engineering and Physical Sciences Research Council (EPSRC) for supporting this work through the NNUMAN Research Programme (Grant No. EP/J021172/1). The authors are grateful to Dr. John A. Francis, Prof. Mike Smith, Dr. Neil Irvin, Mr. Paul English, Mr. Ian Winstanley and Ms. J. Grant for their valuable contributions and worthy suggestions to the fabrication, analysis and timely completion of the welds and to the extraction of test coupons.

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  1. Dinesh W. Rathod

    Present address: Department of Mechanical Engineering, Thapar Institute of Engineering and Technology, Patiala, 147004, India

Authors and Affiliations

  1. School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester, M13 9PL, UK

    Dinesh W. Rathod, Yongle Sun & Matthew J. Roy

  2. School of Materials, The University of Manchester, Manchester, M13 9PL, UK

    Gideon Obasi

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  1. Dinesh W. Rathod
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Rathod, D.W., Sun, Y., Obasi, G. et al. Effect of multiple passes on Lüders/yield plateaus, microstructure and tensile behaviour of narrow-gap thick-section weld plates. J Mater Sci 54, 12833–12850 (2019). https://doi.org/10.1007/s10853-019-03822-z

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