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<p>In this work, the temperature-induced martensite and deformation-induced martensite were introduced into austenitic stainless steel rebar by pre-strain plus cryogenic treatment and deformation respectively, and the corresponding corrosion behavior was comparatively investigated in a saturated Ca(OH)₂ solution containing 3.5 wt% NaCl. The results showed that a higher corrosion resistance was achieved in the steel with temperature-induced martensite. This was predominantly attributed to the lower density of geometric necessary dislocation (GND) and higher proportion of special grain boundaries (SGBs) with low Σ-value in the steel with temperature-induced martensite. On the one hand, the high density of GND weakened the compactness and stability of the passivation film by increasing the oxide vacancies and decreasing the amount of iron/chromium oxides in the passivation film. On the other hand, the high proportion of SGBs with low Σ-value can suppress the initial stage of corrosion through inhibiting the formation of chromium carbides and disrupting the connectivity of the random boundary network. As a result, the combined effect of the two factors contributed to a higher corrosion resistance in the steels with temperature-induced martensite than that with deformation-induced martensite.</p>

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Improving corrosion resistance and passive film stability associated with martensite in austenitic stainless steel rebar by tailoring martensitic transformation

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Xiaohui Xi,
  • Zhikun Liu,
  • Jinliang Wang,
  • Wei Luo,
  • Jiali Lin,
  • Ning Xu,
  • Yuwan Tian,
  • Xiaoyun Sun,
  • Dongmei Wang

摘要

In this work, the temperature-induced martensite and deformation-induced martensite were introduced into austenitic stainless steel rebar by pre-strain plus cryogenic treatment and deformation respectively, and the corresponding corrosion behavior was comparatively investigated in a saturated Ca(OH)₂ solution containing 3.5 wt% NaCl. The results showed that a higher corrosion resistance was achieved in the steel with temperature-induced martensite. This was predominantly attributed to the lower density of geometric necessary dislocation (GND) and higher proportion of special grain boundaries (SGBs) with low Σ-value in the steel with temperature-induced martensite. On the one hand, the high density of GND weakened the compactness and stability of the passivation film by increasing the oxide vacancies and decreasing the amount of iron/chromium oxides in the passivation film. On the other hand, the high proportion of SGBs with low Σ-value can suppress the initial stage of corrosion through inhibiting the formation of chromium carbides and disrupting the connectivity of the random boundary network. As a result, the combined effect of the two factors contributed to a higher corrosion resistance in the steels with temperature-induced martensite than that with deformation-induced martensite.