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The influence of laser powder-bed fusion microstructures on the corrosion behavior of CuSn alloy

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Abstract

Selective laser melting (SLM), a laser powder-bed fusion technique, shows unique heterogeneous microstructures because of the complex thermal history they experience during layer-wise part fabrication. The current work attempts to establish the influence of these microstructures on the corrosion behavior of the SLM processed CuSn alloy. The as-built SLM samples showed heterogeneous epitaxial columnar grains, fine cellular dislocation structure (~ 600 nm) with cell boundaries having higher dislocation density and solute Sn concentration than the cell interior, super-saturated solid-solution with ~ 6.5 wt% of Sn in Cu, and fine second-phase δ (Cu41Sn11) ~ 200 nm. The SLM microstructures affected the corrosion behavior of the CuSn alloy: the as-built samples showed high corrosion rate than the post-SLM heat-treated fully recrystallized samples. The effects of the residual stresses, cellular segregation, and second-phase δ (Cu41Sn11) on the corrosion behavior are minimal. The dislocation density and distribution primarily control the corrosion behavior of the SLM processed CuSn alloy. The partially recrystallized microstructures with heterogeneous dislocation distribution showed an increased corrosion rate.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT), the Korean Institute of Energy Technology Evaluation and Planning (KETEP), and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (2021R1A2C3006662 and 20201510100030). Dr. GMK, Dr. FH, and Dr. PS are supported by the Brain Pool Program through the NRF of Korea, the Ministry of Science, and ICT (2019H1D3A1A01102866, 2020H1D3A1A04105882, 2017H1D3A1A01013666).

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Author notes

  1. G. M. Karthika and Farahnaz Haftlang have contributed equally to this work.

Authors and Affiliations

  1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    G. M. Karthik, Farahnaz Haftlang, Jaeik Kwak, Praveen Sathiyamoorthi, Yong-Tae Kim & Hyoung Seop Kim

  2. Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi, 221005, India

    Praveen Sathiyamoorthi

  3. Graduate Institute of Ferrous and Energy Materials Technology, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Alireza Zargaran & Hyoung Seop Kim

  4. Institute for Convergence Research and Education in Advanced Technology, Yonsei University, Seoul, 03722, South Korea

    Hyoung Seop Kim

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  1. G. M. Karthik
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Correspondence to Hyoung Seop Kim.

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Karthik, G.M., Haftlang, F., Kwak, J. et al. The influence of laser powder-bed fusion microstructures on the corrosion behavior of CuSn alloy. J Mater Sci 57, 17923–17934 (2022). https://doi.org/10.1007/s10853-022-07137-4

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