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<p>In aggressive environments, conventional welding techniques very often compromise the corrosion resistance and durability of UNS N08367 super austenitic stainless steel. To enhance the weld integrity and performance of UNS N08367 in extreme environments, an attempt was made to explore the potential advantages of the spin arc gas metal arc welding (SA-GMAW) process. The impact of SA-GMAW parameters on the macro and microstructure, microhardness, tensile properties, and corrosion resistance of UNS N08367 welds was examined. Microstructural analysis demonstrated significant grain refinement in the fusion zone, resulting from sufficient current and high spin speed, which promoted the formation of fine austenite grains and delta phases. Further, due to phase balance and enhanced stirring action, mechanical testing showed the highest hardness and tensile strength. Potentiodynamic polarization tests revealed that the enhanced corrosion resistance was attributed to its refined microstructure and uniform phase distribution. X-ray diffraction (XRD), transmission electron microscopy (TEM), and selected area electron diffraction (SAED) confirmed the presence of austenite peaks and delta phases, contributing to mechanical and corrosion performance. These results highlighted the significance of the relationship and also the importance of welding parameters.</p>

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Experimental investigation and characterization analysis of super austenitic stainless steel using spin arc—gas metal arc welding process

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Arunkumar G.,
  • Umar M.,
  • Sathiya P.

摘要

In aggressive environments, conventional welding techniques very often compromise the corrosion resistance and durability of UNS N08367 super austenitic stainless steel. To enhance the weld integrity and performance of UNS N08367 in extreme environments, an attempt was made to explore the potential advantages of the spin arc gas metal arc welding (SA-GMAW) process. The impact of SA-GMAW parameters on the macro and microstructure, microhardness, tensile properties, and corrosion resistance of UNS N08367 welds was examined. Microstructural analysis demonstrated significant grain refinement in the fusion zone, resulting from sufficient current and high spin speed, which promoted the formation of fine austenite grains and delta phases. Further, due to phase balance and enhanced stirring action, mechanical testing showed the highest hardness and tensile strength. Potentiodynamic polarization tests revealed that the enhanced corrosion resistance was attributed to its refined microstructure and uniform phase distribution. X-ray diffraction (XRD), transmission electron microscopy (TEM), and selected area electron diffraction (SAED) confirmed the presence of austenite peaks and delta phases, contributing to mechanical and corrosion performance. These results highlighted the significance of the relationship and also the importance of welding parameters.