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Proceeding Paper

Microstructural Refinement and Improvement of Microhardness of a Hypoeutectic Al–Fe Alloy Treated by Laser Surface Remelting †

Faculty of Mechanical Engineering, University of Campinas, São Paulo 13083-860, Brazil
*
Author to whom correspondence should be addressed.
Presented at the 2nd Coatings and Interfaces Web Conference, 15–31 May 2020; Available online: https://ciwc2020.sciforum.net/.
Mater. Proc. 2020, 2(1), 16; https://doi.org/10.3390/CIWC2020-06813
Published: 7 May 2020
(This article belongs to the Proceedings of 2nd Coatings and Interfaces Web Conference (CIWC-2 2020))
In laser surface remelting (LSR) treatment, only a small region is affected by heat, surpassing the melting temperature, followed by rapid cooling at 103–108 K/s, thus producing an extremely refined microstructure. The treated region shows a more homogeneous microstructure and better mechanical properties as compared to the substrate. Iron is a common impurity found in Al-based alloys but in the 2618 commercial alloy, around 1 wt.% of Fe is intentionally added to improve the high temperature strength and the corrosion resistance. In this work, LSR experiments were performed, by using a CO2 laser operating in a continuous-wave mode, to investigate the influence of process parameters on the treated surface of an as-cast Al-1 wt.% Fe alloy. These parameters encompass work distance (z), laser beam speed (v) and laser average power (P), setting a total of 18 combinations. The configuration of z = 6 mm, v = 500 mm/s and P = 800 W resulted in a molten pool with 710 µm of width for 242 µm of length without major porosities, therefore being the largest stable pool amongst all parameter combinations. The resulting cellular microstructure is shown to have an average interphase spacing of 0.93 ± 0.17 µm, a decrease of about 14 times in relation to that of the substrate. The effects of LSR on microhardness were remarkable, with the remelted track presenting Vickers microhardness of 50.1 ± 2 HV, which corresponds to increase of about 43% as compared to that of the original substrate.
Keywords: Al-Fe alloys; laser surface remelting; microstructure; vickers microhardness Al-Fe alloys; laser surface remelting; microstructure; vickers microhardness
MDPI and ACS Style

Oliveira, R.; Kakitani, R.; Cangerana, K.C.B.; Garcia, A.; Cheung, N. Microstructural Refinement and Improvement of Microhardness of a Hypoeutectic Al–Fe Alloy Treated by Laser Surface Remelting. Mater. Proc. 2020, 2, 16. https://doi.org/10.3390/CIWC2020-06813

AMA Style

Oliveira R, Kakitani R, Cangerana KCB, Garcia A, Cheung N. Microstructural Refinement and Improvement of Microhardness of a Hypoeutectic Al–Fe Alloy Treated by Laser Surface Remelting. Materials Proceedings. 2020; 2(1):16. https://doi.org/10.3390/CIWC2020-06813

Chicago/Turabian Style

Oliveira, Ricardo, Rafael Kakitani, Karina C. B. Cangerana, Amauri Garcia, and Noé Cheung. 2020. "Microstructural Refinement and Improvement of Microhardness of a Hypoeutectic Al–Fe Alloy Treated by Laser Surface Remelting" Materials Proceedings 2, no. 1: 16. https://doi.org/10.3390/CIWC2020-06813

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