Insights into high-temperature oxidation of Fe-Mn-Si-Cr-Ni shape memory stainless steels and its relationship to alloy chemical composition

R. Silva, G. S. Vacchi, I. G.R. Santos, A. M. de Sousa Malafaia, C. L. Kugelmeier, A. A. Mendes Filho, C. Pascal, V. L. Sordi, C. A.D. Rovere

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Abstract

The relationship between alloy chemical composition and oxidation behavior of austenitic Fe-Mn-Si-Cr-Ni shape memory stainless steels (SMSSs) during exposure at 800 °C in air was investigated. Although high Si and Cr additions are beneficial for both the shape memory effect and oxidation resistance, the increase of these ferrite stabilizer elements in Fe-Mn-Si-Cr-Ni SMSSs makes the oxidation-induced ferrite stable at the early stages of the oxidation exposure, which in turn allows a faster diffusion of Mn, controlling the kinetics of oxidation. Our results suggested that the austenite stability should be maintained during the oxidation process for higher performance of these materials.

Original languageEnglish
Article number108269
Number of pages10
JournalCorrosion Science
Volume163
DOIs
Publication statusPublished - Feb 2020
Externally publishedYes

Keywords

  • Austenitic FeMnSiCrNi shape memory stainless steels
  • High-temperature oxidation
  • Microstructure
  • TEM
  • Thermodynamic calculations

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