Liu, Y.; Zhang, S.; Zhang, L.; Zheng, L.; Li, Z.; Zhang, L.; Zhang, G. Effects of Oxygen Content on Microstructure and Creep Property of Powder Metallurgy Superalloy. Crystals2024, 14, 358.
Liu, Y.; Zhang, S.; Zhang, L.; Zheng, L.; Li, Z.; Zhang, L.; Zhang, G. Effects of Oxygen Content on Microstructure and Creep Property of Powder Metallurgy Superalloy. Crystals 2024, 14, 358.
Liu, Y.; Zhang, S.; Zhang, L.; Zheng, L.; Li, Z.; Zhang, L.; Zhang, G. Effects of Oxygen Content on Microstructure and Creep Property of Powder Metallurgy Superalloy. Crystals2024, 14, 358.
Liu, Y.; Zhang, S.; Zhang, L.; Zheng, L.; Li, Z.; Zhang, L.; Zhang, G. Effects of Oxygen Content on Microstructure and Creep Property of Powder Metallurgy Superalloy. Crystals 2024, 14, 358.
Abstract
Effects of oxygen content on microstructure and creep property of FGH96 superalloy were investigated. When oxygen content increased from 135ppm to 341ppm, prior particle boundary (PPB) rose from degree 2 to degree 3, and the size of γ′ phase on PPB enlarged from 1.07μm to 1.27μm, and MC carbide size grew from 77.4nm to 104.0nm. Meanwhile, the steady creep rate accelerated form 4.34×10-3 h-1 to 1.87×10-2 h-1, and the creep rupture life shortened from 176h to 94h, and the creep rupture mode transferred from intergranular and transgranular mixed fracture to along PPB fracture. During creep, the micro-twins formation and gliding will be restrained by ∑3 boundaries. FGH96 superalloy with higher oxygen content contains less ∑3 boundaries and its micro-twins cross slipped instead of single direction slip in lower oxygen content superalloy. Consequently, specimen with higher oxygen content creeped faster and raptured earlier.
Chemistry and Materials Science, Materials Science and Technology
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