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| Hot Gas Corrosion Behavior of Single Crystal Superalloy DD6 at Different Temperature |
| Received:October 29, 2023 Revised:December 11, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.12.003 |
| KeyWord:DD6 single crystal super alloy hot gas corrosion microstructure internal vulcanization |
| Author | Institution |
| YANG Li-yuan |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| ZHANG Qi |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| SUN Zhi-hua |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| LIU Ming |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
| ZHAO Ming-liang |
Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, AECC Beijing Institute of Aeronautical Materials, Beijing , China |
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| Abstract: |
| The work aims to study the corrosion resistance of DD6 super alloy in three typical hot gas corrosion environments at 650 ℃, 800 ℃ and 950 ℃. The corrosion behavior of DD6 super alloy was investigated by X-Ray Diffraction, scanning election microscopy and energy dispersive X-ray spectrum (EDS). The hot corrosion rate of alloy increased with the increase of temperature. The hot corrosion rates at 650 ℃ and 800 ℃ were relatively low. Significant spallation of corrosion products and obvious corrosion occurred at 950 ℃. The corrosion layer of DD6 alloy at 650 ℃ was relatively thin, mainly composed of oxides such as NiO and Al2O3. The corrosion products were divided into two layers at 800 ℃ and 950 ℃. The outer layer consisted of two parts, the outermost layer was a mixture of a thin layer of NiO and Co3O4, the secondary layer was loose NiO and the inner layer was a relatively dense corrosion layer composed of Al2O3 and Cr2O3. The phase γ' degradation zone appeared in the alloy below the corrosion layer, and there was obvious internal vulcanization phenomenon which accelerated the hot corrosion. |
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