| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
|
| Presentation Title |
Fabricating Crack-Free, High-Density Inconel 738LC Using Direct Energy |
| Author(s) |
Yusufu Ekubaru, Nakabayashi Takuya |
| On-Site Speaker (Planned) |
Yusufu Ekubaru |
| Abstract Scope |
Inconel 738LC is a gamma prime (γ')-strengthened, low-carbon (LC) nickel-based superalloy widely used for stage 3 blades in the hot sections of power generation and aircraft gas turbines. It is well known that γ' precipitation-strengthened Ni-based superalloys suffer from poor printability due to a high tendency for cracking. One of the main types of cracking that occurs in the heat-affected zone (HAZ) is liquation cracking. Reducing the HAZ is considered a strategy to avoid liquation cracking, which can be achieved by increasing the cooling rate. Generally, this can be accomplished by either decreasing the power or increasing the scan speed. In this study, we adopted the approach of increasing the cooling rate by decreasing the power in combination with using a smaller hatch spacing. As a result, a crack-free, high-density sample was successfully produced by using a lower power of 140 W and a smaller hatch spacing of 0.3 mm. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Copper / Nickel / Cobalt |