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Microstructure, cracking behavior and control of Al–Fe–V–Si alloy produced by selective laser melting

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Abstract

Selective laser melting (SLM) technology based on atomized powder was used to fabricate Al–8.5Fe–1.3V–1.7Si (wt%) alloy parts. The microstructure and crack characterization of SLM samples fabricated at various conditions were presented. Results show that the cracks appear periodically along the building direction, initiate preferably at the outer edges of the as-built samples and propagated along the remelting border zone (RBZ) into deposited layers. Solid-phase cracking is proposed according to the fracture morphology. The thermal-induced residual stress during SLM combined with the precipitation of relatively large-sized AlmFe phase in the RBZ results in the formation of cracks. Enhancing scanning speed and hatch distance enable to reduce the cracking sensitivity. The crack-free Al–8.5Fe–1.3V–1.7Si parts can be fabricated at optimized parameters of laser power of 320 W, scanning speed of 1000 mm·s−1 and hatch distance of 0.10 mm along with proper laser pre-heating procedure. The samples built horizontally show good ultimate tensile properties of 454 MPa in average with the elongation of 7.2%.

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Acknowledgements

This study was financially supported by the National High-Tech Program of China (No. 21100002013101006).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Shao-Bo Sun, Li-Jing Zheng & Hu Zhang

  2. Modern Manufacturing Engineering Center, Heilongjiang Institute of Science and Technology, Harbin, 150027, China

    Jin-Hui Liu

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  1. Shao-Bo Sun
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  2. Li-Jing Zheng
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  3. Jin-Hui Liu
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  4. Hu Zhang
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Correspondence to Li-Jing Zheng.

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Sun, SB., Zheng, LJ., Liu, JH. et al. Microstructure, cracking behavior and control of Al–Fe–V–Si alloy produced by selective laser melting. Rare Met. 42, 1353–1362 (2023). https://doi.org/10.1007/s12598-016-0846-9

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  • DOI: https://doi.org/10.1007/s12598-016-0846-9

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