Enhancing AISI 321 stainless steel's high-temperature oxidation resistance at 600 °C through surface nanocrystallization and pre-oxidation synergy

Nejati, Samaneh; Pour-Ali, Sadegh; Tavangar, Reza

doi:10.1016/j.surfcoat.2024.130747

Surface and Coatings Technology

2024

DOI: 10.1016/j.surfcoat.2024.130747

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Enhancing AISI 321 stainless steel's high-temperature oxidation resistance at 600 °C through surface nanocrystallization and pre-oxidation synergy

Samaneh Nejati,

Sadegh Pour-Ali,

Reza Tavangar

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Synergy of Nanocrystallinity, Temperature, and “the Third Element Effect” for Uncommon Oxidation Resistance of Fe‐Cr‐Al Alloys

Raman,

Kumar,

Bakshi

2024

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Nanocrystalline structure, oxidation temperature, and “The Third Element Effect” are among the factors that can profoundly govern the characteristics of the oxide scales that develop on oxidation‐resistant alloys, thereby, their synergistic effect can considerably influence alloys’ oxidation kinetics. As a result of the synergy, certain iron‐chromium‐aluminium (Fe‐Cr‐Al) alloy showed superior oxidation resistance at 800 °C than at 700 °C (whereas oxidation resistance commonly decreases with the increase in temperature). The superior resistance at higher temperatures is considerably enhanced when the structure of the alloy is nanocrystalline vis‐à‐vis the common microcrystalline structure. Nanocrystalline alloy oxidizes at a negligible rate (c.f., its microcrystalline counterpart). The characterization of the oxide scale demonstrates that the oxidation temperature governs the formation of the protective oxide scale with/without the assistance of the “Third element Effect”. The findings may potentially have considerable commercial implications.

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Synergy of Nanocrystallinity, Temperature, and “the Third Element Effect” for Uncommon Oxidation Resistance of Fe‐Cr‐Al Alloys

Raman,

Kumar,

Bakshi

2024

Small

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Early Stages of High‐Temperature Oxidation Behavior and Its Phase Evolution of 9% Ni Steel

Mingqi,

Fujun,

Yong

et al. 2024

steel research int.

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Herein, the effects of oxygen partial pressure (5–20%) and oxidation time (0.5–6 h) on the growth behavior and phase structure of 9% Ni steel oxide layer are studied by means of high‐temperature oxidation experiment, scanning electron microscopy, and X‐ray diffraction. The results show that the inner and outer oxide layers of 9% Ni steel grow opposite to each other along the initial surface direction of the vertical matrix during the high‐temperature oxidation process. From the perspective of the phase, the phase transition of Fe2O3→Fe3O4→FeO mainly undergoes from the outside and the inside, the results of thermodynamic calculations show that <<<0, and the main factor affecting the phase transition is the diffusion concentration of free O and Fe atoms. During the high‐temperature oxidation process of 9% Ni steel, the diffusion of O and Fe atoms along grain boundaries promotes preferential oxidation at these boundaries. The columnar structure formed in the outer oxide layer of 9% Ni steel may be related to the uneven diffusion rate of Fe atoms at different positions at the interface between the inner and outer oxide layers.

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Enhancing AISI 321 stainless steel's high-temperature oxidation resistance at 600 °C through surface nanocrystallization and pre-oxidation synergy

Cited by 2 publications

References 40 publications

Synergy of Nanocrystallinity, Temperature, and “the Third Element Effect” for Uncommon Oxidation Resistance of Fe‐Cr‐Al Alloys

Synergy of Nanocrystallinity, Temperature, and “the Third Element Effect” for Uncommon Oxidation Resistance of Fe‐Cr‐Al Alloys

Early Stages of High‐Temperature Oxidation Behavior and Its Phase Evolution of 9% Ni Steel

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