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<p>Low nickel austenitic stainless steel exhibits superior mechanical properties due to the combined effects of strain-induced transformation from austenite (FCC) to α-martensite (BCC) and dislocation slip. Both strain level and strain path significantly affect these mechanisms. In this study, forming limit diagrams were developed for 0.7 mm thick sheets, and microstructural characterization was performed at low (LS), intermediate (IS), and high (HS) strain levels under biaxial stretching (BS), plane strain (PS), and uniaxial stretching (US) using EBSD and XRD. The results showed that biaxial stretching produced the highest grain average misorientation (GAM), indicating greater local misorientation due to slip activity, followed by plane strain and uniaxial stretching. In contrast, the α-martensite volume fraction followed the reverse order (US &gt; PS &gt; BS). These findings highlight the importance of detailed microstructural analysis to correlate deformation mechanisms and crystallographic texture with mechanical properties.</p>

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Effect of concurrent microstructure and texture evolution on formability of low-Ni austenitic stainless steel

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Shanta Chakrabarty,
  • Sushil K. Mishra,
  • Prita Pant

摘要

Low nickel austenitic stainless steel exhibits superior mechanical properties due to the combined effects of strain-induced transformation from austenite (FCC) to α-martensite (BCC) and dislocation slip. Both strain level and strain path significantly affect these mechanisms. In this study, forming limit diagrams were developed for 0.7 mm thick sheets, and microstructural characterization was performed at low (LS), intermediate (IS), and high (HS) strain levels under biaxial stretching (BS), plane strain (PS), and uniaxial stretching (US) using EBSD and XRD. The results showed that biaxial stretching produced the highest grain average misorientation (GAM), indicating greater local misorientation due to slip activity, followed by plane strain and uniaxial stretching. In contrast, the α-martensite volume fraction followed the reverse order (US > PS > BS). These findings highlight the importance of detailed microstructural analysis to correlate deformation mechanisms and crystallographic texture with mechanical properties.