Microstructure and high-temperature oxidation resistance of wire and arc additively manufactured Si-containing 9Cr oxide dispersion strengthened steel
Three 9Cr oxide dispersion strengthened (ODS) steels with addition of 0.5–2 wt% Si were fabricated by wire and arc additive manufacturing (WAAM) technique in this work. Their microstructures and oxidation behavior at 800 °C were systematically studied. The WAAM-processed steels exhibited refined mar...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425011482 |
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| Summary: | Three 9Cr oxide dispersion strengthened (ODS) steels with addition of 0.5–2 wt% Si were fabricated by wire and arc additive manufacturing (WAAM) technique in this work. Their microstructures and oxidation behavior at 800 °C were systematically studied. The WAAM-processed steels exhibited refined martensite lath bundles due to rapid solidification. Increasing Si content (1–2 wt.%) further refined martensitic laths, enhanced dislocation density, and promoted the formation of high-density (∼6.54 × 1023 m−3) Y2SiO5 nano-oxides (∼3.43 nm) within the matrix. Notably, the 2Si steel demonstrated exceptional oxidation resistance, with a rate of 0.36 × 10−3 mg cm−2 h−1, surpassing most commercial heat-resistant steels. This improvement is attributed to a tri-layered Cr1.5Mn1.5O4/Cr2O3/SiO2(amorphous) oxide scale, which effectively inhibits oxygen inward diffusion. |
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| ISSN: | 2238-7854 |