Microstructure and Hardness Properties of Oxide Dispersion Strengthened Fe-18Cr Ferritic Steels Reinforced with Nano-Alumina

Abstract:

Oxide dispersion strengthening steel (ODS) is widely used in high-severity environments in supercritical water gasification (SCWG) due to its high-temperature corrosion resistance and fatigue strength. Nano-oxide can be used as reinforcement for ODS steel to enhance the mechanical properties by retarding dislocation at grain boundaries. This work aims to study the fabrication of Fe-18Cr ODS steels reinforced with 0.5-3.0 wt% nano-Al₂O₃ contents. The microstructure of ODS steels before and after sintering processes was observed by an optical microscope, and the hardness test was conducted by a Micro-Vickers hardness tester. The results showed the mass gain increased by 49.18±10.75 mg cm^-2 due to the formation of Fe₂O₃ during the sintering process. The average porosity of ODS steels after sintering decreased by about 60% due to thermal contraction, resulting in their average densities increased by around 7 %. Moreover, the hardness of Fe-18Cr ODS steels increased up to 120 HV with the increase in nano-Al₂O₃ percentage.

• Periodical: Materials Science Forum (Volume 1141)
• Pages: 27-34
• DOI: https://doi.org/10.4028/p-xuCS5J
• Online since: December 2024
• Authors: Ratchapon Nilprapa, Saowaluk Chaleawlert-Umpon, Thitaporn Kunmin, Nattavipa Phanchalermchai, Panpech Deedphueng, Jennarong Tungtrongpairoj*
• Keywords: Ferritic Steel, Nanocomposite, Oxide Dispersion Strengthening Steel, Power Plant

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