| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Advances in Surface Engineering
|
| Presentation Title |
Graded Coatings of IN 625 Alloy Reinforced with Ni3Al Precipitates Processed In-situ |
| Author(s) |
Viviane Teleginski Mazur, Ana Sofia Clímaco Monteiro d'Oliveira, Maurício Marlon Mazur |
| On-Site Speaker (Planned) |
Ana Sofia Clímaco Monteiro d'Oliveira |
| Abstract Scope |
Hardfacing coatings take advantage of multilayer deposition to minimize negative impacts of dilution on substrate. This study takes a step further using multilayer to mitigate dilution and also impose a compositional gradient, adding functionality to hardfacing coating. Smooth and sharp multilayered graded IN625 coatings were processed by Plasma Transferred Arc using powder mixtures of Ni and Al (Ni+25wt.%Al), aiming to impose compositional gradients in IN625 without compromising weldability and simultaneously gain oxidation resistance. Sharp gradients were obtained depositing 80wt.%(Ni+Al) on top of IN625 layer, while smooth gradients were obtained with increasing Ni+Al content in five layers (10, 20, 40, 80wt.%) added to IN625. Results shows in-situ synthesis of Ni3Al precipitates and absence of cracks, confirming that weldability was not compromised. Coating hardness and oxidation resistance were improved with the imposed gradient. Different mechanisms of strengthening were observed and are related to the with Al content in the powder mixtures. |