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<p>The deformation behavior of 2205 duplex stainless steel was analyzed using in situ electron backscatter diffraction (EBSD) and scanning electron microscopy (SEM) to investigate phase-specific strain accommodation mechanisms. Results indicate that the slip deformation in the austenite and ferrite phases correlates with their mechanical property differences. In austenite, Σ3 boundaries enclosing twins demonstrated effective deformation compatibility. As strain increased, the slip systems activated remained consistent with those predicted by the maximum Schmid factor. In contrast, ferrite exhibited cross-slip behavior due to the simultaneous activation of {110} and {112} slip systems, deviating from the Schmid law. The evolution of low-angle grain boundaries (LAGBs) was a dominant deformation feature in ferrite, with the density of LAGBs increasing during tensile deformation. Additionally, preferential rotation of grain subdomains led to misorientation accumulation near original high-angle grain boundaries (HAGBs) and triple junctions, forming new HAGBs. These findings reveal coordinated deformation mechanisms involving grain rotation and slip interactions between the two phases.</p>

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Dynamic evolution of austenite/ferrite grain boundary structure during in-situ tensile deformation in dss 2205 duplex steel

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Juan Li,
  • Chuanlong Han,
  • Qingyao Tang,
  • Guanghui Zhao,
  • Huaying Li

摘要

The deformation behavior of 2205 duplex stainless steel was analyzed using in situ electron backscatter diffraction (EBSD) and scanning electron microscopy (SEM) to investigate phase-specific strain accommodation mechanisms. Results indicate that the slip deformation in the austenite and ferrite phases correlates with their mechanical property differences. In austenite, Σ3 boundaries enclosing twins demonstrated effective deformation compatibility. As strain increased, the slip systems activated remained consistent with those predicted by the maximum Schmid factor. In contrast, ferrite exhibited cross-slip behavior due to the simultaneous activation of {110} and {112} slip systems, deviating from the Schmid law. The evolution of low-angle grain boundaries (LAGBs) was a dominant deformation feature in ferrite, with the density of LAGBs increasing during tensile deformation. Additionally, preferential rotation of grain subdomains led to misorientation accumulation near original high-angle grain boundaries (HAGBs) and triple junctions, forming new HAGBs. These findings reveal coordinated deformation mechanisms involving grain rotation and slip interactions between the two phases.