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<p>AISI 303 austenitic stainless steel powder was cold compacted by a hydraulic die, then heated to 1280 °C under hydrogen atmosphere in a furnace to produce a sintered sample before forging at 1100 °C with a 50% and 80% reduction in height. After forging, the grains stretched, leading to merging of the pores. When electron backscatter diffraction (EBSD) was applied, the hot-forged sample had a higher degree of local crystalline misorientation, indicating a dominant plastic strain. The microstrain was calculated following the Williamson–Hall method using an X-ray diffractometer (XRD). The hot-forged samples had a 6-fold higher microstrain value than the sintered samples, and the lattice parameter increased with hot forging. The microhardness trends enlarging with residual stress of the sample when receiving a forging load. Diminished porosity of 32-64% improved the corrosion resistance of the hot forging sample by 42-93% in 3.5 wt.% NaCl solution by reducing crevice corrosion inside pores and keeping the stability of the passive film. Attacked corrosion brought on by grain distortion was ineffective.</p>

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Deformation and Corrosion Resistance of Sintered AISI 303 Austenitic Stainless Steel After Hot Forging

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Sittipong Eiumtadanai,
  • Sithipong Mahathanabodee,
  • Ruangdaj Tongsri,
  • Bhanu Vetayanugul,
  • Panya Wiman

摘要

AISI 303 austenitic stainless steel powder was cold compacted by a hydraulic die, then heated to 1280 °C under hydrogen atmosphere in a furnace to produce a sintered sample before forging at 1100 °C with a 50% and 80% reduction in height. After forging, the grains stretched, leading to merging of the pores. When electron backscatter diffraction (EBSD) was applied, the hot-forged sample had a higher degree of local crystalline misorientation, indicating a dominant plastic strain. The microstrain was calculated following the Williamson–Hall method using an X-ray diffractometer (XRD). The hot-forged samples had a 6-fold higher microstrain value than the sintered samples, and the lattice parameter increased with hot forging. The microhardness trends enlarging with residual stress of the sample when receiving a forging load. Diminished porosity of 32-64% improved the corrosion resistance of the hot forging sample by 42-93% in 3.5 wt.% NaCl solution by reducing crevice corrosion inside pores and keeping the stability of the passive film. Attacked corrosion brought on by grain distortion was ineffective.