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<p>The mechanical properties of P92 (9Cr-0.5Mo-1.8W-VNb) steel weld joints, fabricated through tungsten inert gas (TIG) and activated TIG (A-TIG) welding, were compared. The non-monotonous variations in tensile and creep properties across the heterogeneous microstructural regions of both the weld joints were obtained using small specimen testing techniques. The A-TIG weld joint showed higher tensile strength than conventional TIG weld joint. The weld metal of A-TIG showed better creep resistance compared to the other zones of the A-TIG as well as all zones of the conventional TIG weld joint. The activation energies under creep for both the weld joints were found to be in the range of 385–418&#xa0;kJ/mol, indicating that dislocation creep is the governing creep mechanism under investigated conditions. The low cycle fatigue behaviour of both the weld joints were evaluated under the applied strain amplitudes between ± 0.25 and ± 0.6% at room temperature and at 873&#xa0;K. Both the weld joints exhibited continuous cyclic softening before a drastic reduction in the stress value due to the macrocrack propagation and eventual failure. The A-TIG weld joint showed better fatigue life than conventional TIG weld joint.</p>

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Evaluation of strength, creep and low cycle fatigue behaviour of 9Cr-1.8W-VNb (P92) steel weld joints

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月12日

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  • V. Madurai Muthu,
  • J. Ganesh Kumar,
  • P. Vasantharaja,
  • K. Mariappan,
  • Naveed Hussain,
  • M. Vasudevan

摘要

The mechanical properties of P92 (9Cr-0.5Mo-1.8W-VNb) steel weld joints, fabricated through tungsten inert gas (TIG) and activated TIG (A-TIG) welding, were compared. The non-monotonous variations in tensile and creep properties across the heterogeneous microstructural regions of both the weld joints were obtained using small specimen testing techniques. The A-TIG weld joint showed higher tensile strength than conventional TIG weld joint. The weld metal of A-TIG showed better creep resistance compared to the other zones of the A-TIG as well as all zones of the conventional TIG weld joint. The activation energies under creep for both the weld joints were found to be in the range of 385–418 kJ/mol, indicating that dislocation creep is the governing creep mechanism under investigated conditions. The low cycle fatigue behaviour of both the weld joints were evaluated under the applied strain amplitudes between ± 0.25 and ± 0.6% at room temperature and at 873 K. Both the weld joints exhibited continuous cyclic softening before a drastic reduction in the stress value due to the macrocrack propagation and eventual failure. The A-TIG weld joint showed better fatigue life than conventional TIG weld joint.