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Comparative Study of Microstructure and Mechanical Properties of X80 SAW Welds Prepared Using Different Wires and Heat Inputs

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Abstract

The present work investigated the effect of weld composition and welding heat input on the microstructure and mechanical properties of two submerged arc welded (SAW) joints of API 5L-X80 pipeline steel. The weld metals were joined by two welding consumables (one is rich in C, Ni, Cr, Mo) under different welding heat inputs (20-22 and 34-36 kJ/cm for single-wire and triple-wire processes, respectively). The triple-wire welding procedure with less C, Ni, Cr, Mo alloy contents favors the formation of acicular ferrite (AF), whereas single-wire welding procedure with increased C, Ni, Cr, Mo contents promotes the formation of lath bainite (LB). Nanoindentation is used to evaluate the property of different microstructures. The hardness of lath bainite (LB), granular bainite (GB) and acicular ferrite (AF) is 8.0 GPa, 5.8 GPa and 3.0 GPa, respectively. The Charpy impact energy of weld metal with triple-wire welding procedure (136-165 J) is much greater than that with single-wire welding procedure (15-44 J) at − 45 °C. Larger cleavage facet size is observed in the fracture surface of single-wire weld metal. A computational procedure is developed to understand the temperature fields during the triple-wire welding. Combining the experiments and numerical simulation, simple models to predict the microstructure evolution through the weld thickness are established.

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The processed data required to reproduce these findings cannot be shared at this time due to legal or ethical reasons. The processed data required to reproduce these findings cannot be shared at this time due to technical or time limitations. The 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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Acknowledgments

This work was supported by National Natural Science Foundation of China (No. 51904243), Natural Science Foundation of Shaanxi Provincial Department (No. 2019JQ-284, 2019JZ-31), Postdoctoral Science Foundation of China (No. 2019M653704) and Australian Research Council Discovery Project (DP180101955).

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Authors and Affiliations

  1. School of Materials and Engineering, Xi’an University of Technology, Xi’an, 710048, China

    Qiaoling Chu, Shuai Xu, Xiongwei Tong, Jie Li, Min Zhang & Fuxue Yan

  2. CGN-DELTA (Jiangsu) PLASTIC and CHEMICAL CO., LTD, Taicang, 215421, China

    Qiaoling Chu

  3. Baoji Petroleum Steel Pipe Co., Ltd, Baoji, 721008, China

    Wanpeng Zhang & Zongyue Bi

  4. School of Mechanical, Medical and Process Engineering, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane, QLD, 4001, Australia

    Cheng Yan

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Chu, Q., Xu, S., Tong, X. et al. Comparative Study of Microstructure and Mechanical Properties of X80 SAW Welds Prepared Using Different Wires and Heat Inputs. J. of Materi Eng and Perform 29, 4322–4338 (2020). https://doi.org/10.1007/s11665-020-04986-5

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