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Microstructural heterogeneity and mechanical anisotropy of 18Ni-330 maraging steel fabricated by selective laser melting: The effect of build orientation and height

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Abstract

Distinguished by a marked combination of high strength and high fracture toughness, 18Ni-300 maraging steel (MS) is widely used for intricate tool and die applications. MS is also amenable to the powder bed fusion additive manufacturing process, providing unique opportunities to make small features and incorporate cooling channels in molds. In this study, tensile test samples were fabricated using selective laser melting 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 the primary a-martensite phase and fine cellular microstructure (~0.66–0.83 µm) with the retained austenite ?-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 the retained ? 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.

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Acknowledgments

The work was supported by the Faculty Research Grant Award at Jacksonville State University. L.L. acknowledges the support by the NASA EPSCoR award NNX15AK29A with the sub-award No.: 2016-045.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, The University of Alabama, 35401, Tuscaloosa, AL, USA

    Yi Yao, Lin Li & Feng Yan

  2. Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, 24061, Blacksburg, VA, USA

    Kaiwen Wang & Wenjun Cai

  3. Department of Applied Engineering, Jacksonville State University, 36265, Jacksonville, AL, USA

    Xiaoqing Wang, Samuel Kelly, Natalia Esparragoza & Matthew Rosser

  4. The Center for Manufacturing Support, Jacksonville State University, 36265, Jacksonville, AL, USA

    Xiaoqing Wang, Samuel Kelly, Natalia Esparragoza & Matthew Rosser

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  1. Yi Yao
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  2. Kaiwen Wang
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  4. Lin Li
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Correspondence to Xiaoqing Wang.

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Yao, Y., Wang, K., Wang, X. et al. Microstructural heterogeneity and mechanical anisotropy of 18Ni-330 maraging steel fabricated by selective laser melting: The effect of build orientation and height. Journal of Materials Research 35, 2065–2076 (2020). https://doi.org/10.1557/jmr.2020.126

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