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<p>This work presents a study on the microstructure, mechanical properties, and fatigue performance of a high-strength steel weld metal to determine its applicability for welding mooring components of offshore platforms. The tested weld metal was obtained from a welded joint of a 114&#xa0;mm-diameter mooring chain and had its microstructure characterized through optical and scanning electron microscopy and electron backscattered diffraction. The mechanical behavior of the weld metal was assessed through tensile, microhardness, and Charpy V-notch impact tests, as well as fatigue tests using the thermographic technique to estimate its fatigue performance. The results showed a microstructure consisting of martensite- and bainite-induced values of ultimate tensile strength and impact toughness of the order of 888&#xa0;MPa and 70 joules at − 20&#xa0;°C, respectively, suitable for the R4 grade steel, while the fatigue tests evidenced an equivalent performance compared with base metals. Besides the applicability of the weld metal for mooring components, this work indicates that the thermographic technique can be an attractive alternative for obtaining fatigue results at a much faster rate and confirming the behavior of welded structures, presenting a contribution to overcoming a big issue for acceptance of welding as an important process for manufacturing and repair.Query</p>

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Microstructure Characterization and Mechanical and Fatigue Properties of a High-Strength Steel Weld Metal Suitable for Mooring Components

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Jorge L. C. Diniz,
  • Jorge C. F. Jorge,
  • Luís Felipe G. de Souza,
  • Matheus C. Mendes,
  • Pedro M. C. L. Pacheco,
  • José Luiz F. Freire,
  • Renato B. Vieira

摘要

This work presents a study on the microstructure, mechanical properties, and fatigue performance of a high-strength steel weld metal to determine its applicability for welding mooring components of offshore platforms. The tested weld metal was obtained from a welded joint of a 114 mm-diameter mooring chain and had its microstructure characterized through optical and scanning electron microscopy and electron backscattered diffraction. The mechanical behavior of the weld metal was assessed through tensile, microhardness, and Charpy V-notch impact tests, as well as fatigue tests using the thermographic technique to estimate its fatigue performance. The results showed a microstructure consisting of martensite- and bainite-induced values of ultimate tensile strength and impact toughness of the order of 888 MPa and 70 joules at − 20 °C, respectively, suitable for the R4 grade steel, while the fatigue tests evidenced an equivalent performance compared with base metals. Besides the applicability of the weld metal for mooring components, this work indicates that the thermographic technique can be an attractive alternative for obtaining fatigue results at a much faster rate and confirming the behavior of welded structures, presenting a contribution to overcoming a big issue for acceptance of welding as an important process for manufacturing and repair.Query