Microstructural evolution and hardness of a heat resistant alloy during long term aging at 700 °C
| Autor: | Hao Chen, Chi Zhang, Zhigang Yang, Zhengdong Liu, Yuqing Weng, Tian Zhongliang, Wenbo Liu, Jiang Senbao |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Heat resistant Microstructural evolution Supersaturation Materials science Precipitation (chemistry) Mechanical Engineering Alloy Metals and Alloys chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Carbide Nickel chemistry Mechanics of Materials 0103 physical sciences Materials Chemistry engineering Composite material 0210 nano-technology Mass fraction |
| Zdroj: | Journal of Alloys and Compounds. 765:1267-1274 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2018.05.263 |
| Popis: | The microstructural evolution of a nickel-based heat resistant alloy during long term aging (10000 h) at 700 °C was systematically investigated. Experimental results showed that the main precipitates after pre-aging treatments were MC, M 23 C 6 and homogeneous γ’ . The weight fraction of γ′ increased continuously with the aging time up to 5000 h, while an obvious coarsening was observed after aging for 100 h. The grain sizes of γ′ precipitates from all aged samples exhibited unimodal distributions, and their coarsening behavior showed good agreement with the LSW model. Compared to the MC carbides, the weight fraction of the M 23 C 6 carbides increased significantly with the increase of the aging time. This could be attributed to their precipitation from the supersaturated matrix. Due to the precipitation and coarsening of γ′, the hardness of the aged samples increased sharply during the first 100 h of aging and then decreased with the increase of the aging time (up to 10000 h). |
| Databáze: | OpenAIRE |
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