Processing and characterization of high aluminum multicomponent (Co,Ni)-based superalloys for friction stir welding (FSW) tools
| Autor: | Maria Ismenia Sodero Toledo Faria, N. Chaia, Alex Matos da Silva Costa, Carlos Angelo Nunes, Gilberto Carvalho Coelho, Victor Ferrinho Pereira, Marcus Vinicius da Silva Salgado, Bruno Xavier de Freitas |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Investment casting Metallurgy 02 engineering and technology Welding 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences law.invention Characterization (materials science) Superalloy Mechanics of Materials law Materials Chemistry Friction stir welding General Materials Science 0210 nano-technology Vacuum induction melting Chemical composition |
| Zdroj: | Materials Today Communications. 25:101282 |
| ISSN: | 2352-4928 |
| DOI: | 10.1016/j.mtcomm.2020.101282 |
| Popis: | Despite the great potential of Friction Stir Welding (FSW) process, there is a lack of technical information on Co-based alloys designed for FSW tools. Therefore, this work evaluated two multicomponent (Co-Ni)-based superalloys tools of high aluminum contents for better wear and oxidation resistance. The two alloys differed on the presence of either Nb or Ta in their chemical composition. The alloys were produced via vacuum induction melting / investment casting and then heat treated at 1000 °C for 16 h. The as-cast and heat-treated microstructures of both alloys presented γ, γ′, Co7W6, CoAl, Laves and MC phases. Yield strength near 550 MPa at 900 °C and hardness values about 500 HV0.5 have been measured for both heat-treated alloys. Friction stir welding (FSW) tools of the two alloys were successfully used to weld (bead on plate) a plate of ASTM A1008 steel. However, superior results have been obtained from the Ta-alloy tool. |
| Databáze: | OpenAIRE |
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