|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Microstructural Heterogeneity and Mechanical Anisotropy of 18Ni-330 Maraging Steel Fabricated by Selective Laser Melting: The Effect of Build Orientation and Height
||Yao Yi, Kaiwen Wang, Xiaoqing Wang, Lin Li, Wenjun Cai, Samuel Kelly, Natalia Esparragoza, Matthew Rosser, Feng Yan
|On-Site Speaker (Planned)
In this study, tensile 18Ni-300 maraging steel samples were fabricated using selective laser melting (SLM) to investigate the effects of built height and orientations on the evolution of the microstructure and the mechanical properties of the samples. The microstructure of the as-fabricated samples consists of primary α-martensite phase and fine cellular microstructure (~ 0.66 - 0.83 μm) with the retained austenite γ-phase aggregated at the boundaries of the cells, resulting in an enhanced mechanical performance compared with traditional counterparts under the same condition (without post-heat treatments). Random grain orientations with weak textures are revealed in all samples. The XY-built samples display better tensile performance when compared to the Z-built samples due to the fine grain sizes and retained γ phase. The bottom of the Z-built sample exhibits a higher hardness than other parts of the sample, which could be attributed to its finer cellular structure.
||Additive Manufacturing, Iron and Steel, Mechanical Properties