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<p>In this study, magnetically impelled arc butt (MIAB) welding was employed to achieve a dissimilar joints of austenitic stainless steel (Super304H) to ferritic-martensitic (T91) steel, with a focus on optimizing the temperature distribution and examining the resulting microstructural evolution. Under the optimized process conditions, the weld exhibited a sound joint with a narrow heat-affected zone (HAZ) of ~1-2&#xa0;mm (Super304H) and 3-4&#xa0;mm (T91), considerably smaller than the 6-7&#xa0;mm typically observed in conventional fusion welds. Electron backscatter diffraction studies (EBSD) revealed a gradient in microstructure across the weld interface, characterized by coarser grains on the Super304H side and finer grains on the T91 side, influenced by both welding parameters and inherent material characteristics. Tensile testing showed slightly lower strength than the base metals, with failures occurring in the partially melted zone on Super304H side. Overall, MIAB welding was found to produce reliable Super304H/T91 dissimilar joints with a narrow HAZ and satisfactory tensile properties (UTS: 600&#xa0;<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\pm\)</EquationSource> <EquationSource Format="MATHML"><math> <mo>±</mo> </math></EquationSource> </InlineEquation>&#xa0;20&#xa0;MPa; YS: 410&#xa0;<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\pm\)</EquationSource> <EquationSource Format="MATHML"><math> <mo>±</mo> </math></EquationSource> </InlineEquation>&#xa0;10&#xa0;MPa; elongation: 15&#xa0;<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\pm\)</EquationSource> <EquationSource Format="MATHML"><math> <mo>±</mo> </math></EquationSource> </InlineEquation>&#xa0;3%).</p>

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Microstructural Evolution and Mechanical Behavior of Magnetically Impelled Arc Butt Welded Dissimilar Joints of Super304H and T91 Steel Pipes

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Abhijith Sahadevan,
  • Ranjith Kumar Ilangovan,
  • N. T. B. N. Koundinya,
  • Murugaiyan Amirthalingam,
  • G. D. Janaki Ram,
  • Ravi Sankar Kottada

摘要

In this study, magnetically impelled arc butt (MIAB) welding was employed to achieve a dissimilar joints of austenitic stainless steel (Super304H) to ferritic-martensitic (T91) steel, with a focus on optimizing the temperature distribution and examining the resulting microstructural evolution. Under the optimized process conditions, the weld exhibited a sound joint with a narrow heat-affected zone (HAZ) of ~1-2 mm (Super304H) and 3-4 mm (T91), considerably smaller than the 6-7 mm typically observed in conventional fusion welds. Electron backscatter diffraction studies (EBSD) revealed a gradient in microstructure across the weld interface, characterized by coarser grains on the Super304H side and finer grains on the T91 side, influenced by both welding parameters and inherent material characteristics. Tensile testing showed slightly lower strength than the base metals, with failures occurring in the partially melted zone on Super304H side. Overall, MIAB welding was found to produce reliable Super304H/T91 dissimilar joints with a narrow HAZ and satisfactory tensile properties (UTS: 600  \(\pm\) ±  20 MPa; YS: 410  \(\pm\) ±  10 MPa; elongation: 15  \(\pm\) ±  3%).