Microstructures and mechanical properties of TiAl/Ni-based superalloy joints brazed with Fe-based filler metal
| Autor: | H. S. Ren, R. Y. Qin, Xinyu Ren, Huaping Xiong, L. Ye, Wen-Wen Li |
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| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Filler metal Materials science Mechanical Engineering Metallurgy Alloy Metals and Alloys 02 engineering and technology engineering.material Microstructure 020501 mining & metallurgy Superalloy 020901 industrial engineering & automation 0205 materials engineering Mechanics of Materials Shear strength engineering Brazing Dissolution Solid solution |
| Zdroj: | Welding in the World. 65:79-85 |
| ISSN: | 1878-6669 0043-2288 |
| DOI: | 10.1007/s40194-020-00998-w |
| Popis: | For the purpose of high-temperature service potential and the weight reduction expectation in aviation engineering applications, dissimilar joining of TiAl alloy to Ni-based superalloy has been conducted with a newly designed Fe-based filler metal. The microstructure and chemical composition at the interfaces were investigated by SEM, EPMA, and XRD. The filler metal consisted of Fe-based solid solution and a small amount of precipitated (Fe, Cr)ss. The wettability experiment results showed that the filler metal presented a stronger reaction tendency and more sufficient spreading behavior on Ni-based superalloy than on TiAl alloy. The brazed joint was composed of TiAl diffusion affected zone, Ni3Al, TiCo, borides, (Ni, Fe, Co, Cr)ss, and γ-TiAl dissolved with Ni. A stronger reaction tendency occurred between Ni and TiAl substrate due to the lower dissolution enthalpies of element Ni in melts of Ti and Al. The joints brazed at 1180 °C/5 min presented a shear strength of 267 MPa at room temperature. |
| Databáze: | OpenAIRE |
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