| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Strain-age Cracking of Nickel-base Superalloys Processed by Laser Beam Melting |
| Author(s) |
David Grange, Bruno Macquaire, Jean-Dominique Bartout, Christophe Colin |
| On-Site Speaker (Planned) |
David Grange |
| Abstract Scope |
Laser Beam Melting (LBM) offers new possibilities to produce parts with a higher geometrical complexity but also raises new challenges to process materials initially designed for casting. IN738LC is a nickel-base superalloy interesting for its high creep resistance and high temperature corrosion resistance. This alloy is made of an austenitic γ matrix reinforced by a high fraction of 𝛾′ - Ni3 (Al,Ti) precipitates, that confer interesting mechanical properties at high temperatures but that also complicate its shaping by the LBM process. Samples in IN738LC exhibited macroscopic cracks after heat-treatment. Interrupted thermal cycles proved that cracking occurs during the heating phase of the solution heat treatment. Microstructural characterizations and stress measurements with X-ray diffraction allowed to better understand the simultaneous phenomena at stake: precipitation of hard phases, stress relaxation and cracking mechanism. The study is enriched with a comparative microstructural analysis between IN738LC and another material with a close composition. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |