About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Tackling Metallic Structural Materials Challenges for Advanced Nuclear Reactors
|
| Presentation Title |
Thermomechanical Fatigue Investigation of SS316L Fabricated via Laser Wire-Directed Energy Deposition |
| Author(s) |
Ritam Pal, Ajay Kushwaha, Kun-Hao Huang, Amrita Basak |
| On-Site Speaker (Planned) |
Amrita Basak |
| Abstract Scope |
Additive manufacturing (AM) offers many opportunities to fabricate structural parts for nuclear power generation industries. SS316L is a popular material that possesses excellent weldability, which makes the material suitable for AM fabrication. Among different AM techniques, laser wire-directed energy deposition (LW-DED) provides numerous advantages such as high deposition rate. In this work, the thermomechanical fatigue behavior of LW-DED SS316L specimens is thoroughly investigated. The specimens are fabricated in an L-DED system with optimized parameters. The experimental investigation includes four different temperatures and total strain ranges at reversed loading conditions. Besides total fatigue life, initiation lives are also obtained. Both total and initiation lives decrease with an increase in temperature and strain range. Fractography analysis presents unconventional fractured surfaces where the initiation zone is found in the interior of the specimens. Furthermore, high-temperature fatigue testing leaves thermal stains on the fractured surface which provides more insight into the crack initiation zone. |