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<p>Energy production through advanced ultra-supercritical (AUSC) facilities is growing in Europe, the USA, Japan, China, and India. Ni-based alloys, especially Alloy 617, are used in turbines, pipes, headers, and tubes in these facilities because they resist oxidation and corrosion above 700&#xa0;°C. Ni-based alloys are more expensive, thus components below 620&#xa0;°C use economical ferritic-grade steels like P91/P92 steel. By welding or joining&#xa0;these materials, a cost-effective solution that meets high functionality and cost-efficiency requirements is achieved. This study examines the tensile properties of a gas tungsten arc welding (GTAW) joint between P92 steel and Alloy 617 at high temperatures. Welded Joint was built with ERNiCrMo-3 filler. High-temperature (HT) tensile tests were performed at 550, 650, and 700&#xa0;°C. Welded joint&#xa0;characteristics were examined using an optical microscope (OM) and a scanning electron microscope (SEM). HT tensile tests showed that the specimens failed at P92 base metal.&#xa0;This demonstrates the welded joint suitable for the Indian AUSC power plants. The fracture surface morphology and precipitates were examined using SEM. Dimples and voids indicated ductile-dominant filler weld failure. The fracture surfaces of welded samples included Cr-rich M<sub>23</sub>C<sub>6</sub> particles. The longitudinal sections of fractured samples showed irregular coarse cavities&#xa0;on the fracture edges at higher temperatures.</p>

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The Behavior of Dissimilar Welded Joint of Alloy 617/P92 Steel at High Temperatures

  • 期刊论文

  • 发表日期：

    2025年1月27日

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  • Amit Kumar,
  • Chandan Pandey

摘要

Energy production through advanced ultra-supercritical (AUSC) facilities is growing in Europe, the USA, Japan, China, and India. Ni-based alloys, especially Alloy 617, are used in turbines, pipes, headers, and tubes in these facilities because they resist oxidation and corrosion above 700 °C. Ni-based alloys are more expensive, thus components below 620 °C use economical ferritic-grade steels like P91/P92 steel. By welding or joining these materials, a cost-effective solution that meets high functionality and cost-efficiency requirements is achieved. This study examines the tensile properties of a gas tungsten arc welding (GTAW) joint between P92 steel and Alloy 617 at high temperatures. Welded Joint was built with ERNiCrMo-3 filler. High-temperature (HT) tensile tests were performed at 550, 650, and 700 °C. Welded joint characteristics were examined using an optical microscope (OM) and a scanning electron microscope (SEM). HT tensile tests showed that the specimens failed at P92 base metal. This demonstrates the welded joint suitable for the Indian AUSC power plants. The fracture surface morphology and precipitates were examined using SEM. Dimples and voids indicated ductile-dominant filler weld failure. The fracture surfaces of welded samples included Cr-rich M23C6 particles. The longitudinal sections of fractured samples showed irregular coarse cavities on the fracture edges at higher temperatures.