| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Accurate Prediction
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| Presentation Title |
Investigating the Fatigue Behaviour of Additively Manufactured
18Ni(300) Maraging Steel for Tooling Applications
|
| Author(s) |
Seyyedehshahrzad Sajjadivand, Mark Hartnett, Denis P. Dowling, Mert Celikin |
| On-Site Speaker (Planned) |
Seyyedehshahrzad Sajjadivand |
| Abstract Scope |
18Ni(300) maraging steels are high-strength, high-toughness alloys, that achieve exceptional mechanical properties through intermetallic precipitates in a martensitic matrix. The martensitic structure, formed by nickel addition rather than high carbon levels, leads to good weldability. The use of additive manufacturing such as Laser Powder Bed Fusion (L-PBF) will allow cost-efficient manufacturing of complex tools with reduced number of processing steps and material waste. However, the fatigue life of L-PBF-produced components is inferior compared to conventional 18Ni(300) maraging steel. This study aims to understand the fatigue behaviour of L-PBF 18Ni(300) maraging steel using high-cycle fatigue testing. The fatigue behaviour was evaluated in both as-built and heat-treated conditions. In-depth analysis was carried out using X-ray μ-Computed Tomography (μ-CT), fractography, and Electron Backscatter Diffraction (EBSD). A correlation was found between microstructural characteristics and fatigue behaviour, providing critical insights for enhancing the performance and durability of tooling components. |
| Proceedings Inclusion? |
Planned: |