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| High Temperature Hot Corrosion of Single Crystal Superalloy DD6 Subject to Varying Amounts of Sodium Salt Deposited |
| Received:November 11, 2023 Revised:December 11, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.12.002 |
| KeyWord:Nickel-based single crystal superalloy DD6 salt deposition amount salt deposition manner hot corrosion corrosion layer oxide layer internal sulfide layer |
| Author | Institution |
| YANG Bai-shun |
School of Aeronautics, Northwestern Polytechnical University, Xi'an , China |
| LI Biao |
School of Aeronautics, Northwestern Polytechnical University, Xi'an , China |
| WANG Si-yuan |
School of Aeronautics, Northwestern Polytechnical University, Xi'an , China |
| ZHANG Teng |
School of Aeronautical Engineering, Air Force Engineering University, Xi'an , China |
| YE Fei |
Zhuzhou Air Force Land Transportation Representative Office, Hunan Zhuzhou , China |
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| Abstract: |
| This study delves into the high-temperature hot corrosion behavior of the Ni-based single-crystal superalloy DD6, employing a hot salt corrosion test (95wt.%Na2SO4+5wt.%NaCl) conducted at 950 ℃. The effects of deposition manner, i.e., periodic deposition and single deposition, and salt amount on the corrosion mechanisms were studied. The experimental results revealed that the superalloy undergoes alkaline molten hot corrosionat the elevated temperature of 950 ℃. The protective surface oxide film was found to deteriorate to corrosion, resulting in internal oxidation, internal sulfidation, and internal chlorination in the subsurface of the superalloy. Notably, a discernible corrosion layer, primarily composed of oxides and chlorides, was observed. As the hot corrosion progresses, the surface substance of the superalloyexperienced spallation, with a more substantial deposition of salt leading to more severe spallation.The severity of high-temperature hot corrosion is intricately linked to both the amount and manner of salt deposition, where a higher salt quantity correlates with more pronounced corrosion. Comparative analysis indicated that the periodic deposition exacerbated the hot corrosion when contrasted with the single deposition manner. The consequential surface spallation resulting from hot corrosion has the potential to significantly compromise the structural integrity of the single-crystal superalloy. |
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