Microstructure evolution of Inconel 625 with 0.4 wt% boron modification during gas tungsten arc deposition
| Autor: | Bin Ouyang, Alexandre Gontcharov, Paul Lowden, Mathieu Brochu, Raynald Gauvin, Yuan Tian |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Argon Mechanical Engineering Metallurgy Metals and Alloys chemistry.chemical_element 02 engineering and technology Tungsten Laves phase 021001 nanoscience & nanotechnology Microstructure Inconel 625 01 natural sciences chemistry.chemical_compound chemistry Mechanics of Materials Boride 0103 physical sciences Materials Chemistry 0210 nano-technology Boron Eutectic system |
| Zdroj: | Journal of Alloys and Compounds. 694:429-438 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2016.10.019 |
| Popis: | Gas tungsten arc deposits were made on substrate of stainless steel 304 using IN625 wires modified with 0.4 wt% B in shielding argon. The temperature profiles were simulated by the modified Rosenthal 3D equation. The re-melting boundary correlated well with the hardness profile and corresponding microstructure evolution along the as-manufactured sample. The upper section had higher hardness than the lower section. This high hardness was attributed to the existence of continuous eutectics (Laves phase and NbC) in the inter-dendritic regions. These eutectics in the lower section partially re-melted in this multi-pass process to form non-continuous features contributing to a lower hardness. Moreover, fine isolated borides precipitated out from the γ matrix in lower section as a result of the multiple thermal cycles. The eutectic phases were identified to be Laves phase with few NbC. The isolated borides were confirmed as M 5 B 3 type of boride by TEM. Modeling of the segregation behavior of the major alloying elements according to Clyne-Kurz equations was conducted and the results were in good agreement with chemical concentration profiles. |
| Databáze: | OpenAIRE |
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