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<p>The effects of the annealing temperatures (800, 1000, 1200&#xa0;°C) on the microstructure evolution and corrosion behavior of laser powder bed fusion (LPBF) 316L stainless steel (SS) were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, energy dispersive spectroscopy, electron backscattered diffraction, X-ray photoelectron spectroscopy, and electrochemical testing. The findings indicated that the corrosion resistance of LPBF 316L SS deteriorated after annealing treatment. The sub-cellular structure disappeared, the grain size increased, (111) orientation and the dislocation density decreased after the annealing treatment. The corrosion resistance deteriorated after the annealing treatment. In addition, the passive film was loose and unstable after the annealing treatment. Meanwhile, O<sup>2−</sup>/OH<sup>−</sup> ratio and Cr<sub>2</sub>O<sub>3</sub> content in the passive film decreased after the annealing treatment. The stability and protection of the passive film were&#xa0;weakened, especially at 800 and 1000&#xa0;°C, leading to a further reduction in&#xa0;the corrosion resistance of the annealed samples.</p>

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Annealing treatment on corrosion resistance deterioration of LPBF 316L SS in 0.1 mol/L HCl solution

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Xiao-qing Zhang,
  • Shu-han Qiang,
  • Jia-xing Fan,
  • Hui-ling Zhou,
  • Lan-lan Yang,
  • Yan-bing Tang,
  • Zhi-hong Liu,
  • Dao-hua Lu

摘要

The effects of the annealing temperatures (800, 1000, 1200 °C) on the microstructure evolution and corrosion behavior of laser powder bed fusion (LPBF) 316L stainless steel (SS) were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, energy dispersive spectroscopy, electron backscattered diffraction, X-ray photoelectron spectroscopy, and electrochemical testing. The findings indicated that the corrosion resistance of LPBF 316L SS deteriorated after annealing treatment. The sub-cellular structure disappeared, the grain size increased, (111) orientation and the dislocation density decreased after the annealing treatment. The corrosion resistance deteriorated after the annealing treatment. In addition, the passive film was loose and unstable after the annealing treatment. Meanwhile, O2−/OH− ratio and Cr2O3 content in the passive film decreased after the annealing treatment. The stability and protection of the passive film were weakened, especially at 800 and 1000 °C, leading to a further reduction in the corrosion resistance of the annealed samples.