| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Rapid Qualification
|
| Presentation Title |
Fatigue Strength of High Strength Low Alloy AF 9628 Steel Fabricated via Laser Powder Bed Fusion |
| Author(s) |
Nemanja Kljestan, Marko Knezevic |
| On-Site Speaker (Planned) |
Nemanja Kljestan |
| Abstract Scope |
High-strength low alloy (HSLA) steels, such as AF9628, are critical materials in the defense and military sectors due to their superior mechanical properties and cost-effectiveness compared to super-alloys. This study investigated the fatigue behavior, including both low cyclic fatigue (LCF) and high cyclic fatigue (HCF), of HSLA AF9628 produced using laser powder bed fusion (LPBF) additive manufacturing. Specimens of the alloy were manufactured in two build orientations to determine anisotropy. The LCF tests were strain-controlled (from 0.4% to 1.2% strain amplitudes), while the HCF tests were stress-controlled (from 460 MPa to 1000 MPa stress range), all conducted at room temperature. Moreover, a set of rolled plate and as-cast specimens were tested to facilitate comparisons. The research revealed the potential of additively manufactured AF9628, with significant performance gains over the as-cast material highlighting the ability of the material to meet stringent performance requirements. Nevertheless, the rolled material exhibited the highest performances. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Mechanical Properties |