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<p>Laser powder bed fusion (LPBF) enables precise control of WE43 magnesium alloy microstructure through tailored laser power-scanning speed (P–v) combinations. Within an optimized energy density window (~ 37&#xa0;J&#xa0;mm<sup>−3</sup>), varying P–v combinations produced a stable bimodal grain structure in which the fine-grain fraction increased from 6 to 16% as P–v combinations rose by 40%. This microstructural transition suppressed coarse RE-rich precipitates, reduced galvanic heterogeneity, and stabilized electrochemical behavior. Consequently, the corrosion rate decreased by ~ 50% (0.83 → 0.41&#xa0;mm/y) while ultimate tensile strength remained constant at ≈ 285–287&#xa0;MPa and yield strength declined modestly (238 → 220&#xa0;MPa), maintaining ≈ 9% ductility. The results establish a quantitative process-structure–property linkage: higher P–v combination promotes fine-grain-dominated microstructures that enhance corrosion resistance without compromising mechanical integrity. These findings demonstrate that P–v combination optimization provides an effective lever to balance strength and corrosion resistance in LPBF-processed WE43 components for aerospace and biomedical applications.</p>

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Balancing mechanical properties and corrosion resistance via bimodal grain-fraction control in LPBF WE43

  • 期刊论文

  • 发表日期：

    2025年12月9日

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  • Zhixian Zhao,
  • Zhiqing Chen,
  • Yiqiang Hao,
  • Jingya Wang,
  • Bin Chen,
  • Xiaoqin Zeng

摘要

Laser powder bed fusion (LPBF) enables precise control of WE43 magnesium alloy microstructure through tailored laser power-scanning speed (P–v) combinations. Within an optimized energy density window (~ 37 J mm−3), varying P–v combinations produced a stable bimodal grain structure in which the fine-grain fraction increased from 6 to 16% as P–v combinations rose by 40%. This microstructural transition suppressed coarse RE-rich precipitates, reduced galvanic heterogeneity, and stabilized electrochemical behavior. Consequently, the corrosion rate decreased by ~ 50% (0.83 → 0.41 mm/y) while ultimate tensile strength remained constant at ≈ 285–287 MPa and yield strength declined modestly (238 → 220 MPa), maintaining ≈ 9% ductility. The results establish a quantitative process-structure–property linkage: higher P–v combination promotes fine-grain-dominated microstructures that enhance corrosion resistance without compromising mechanical integrity. These findings demonstrate that P–v combination optimization provides an effective lever to balance strength and corrosion resistance in LPBF-processed WE43 components for aerospace and biomedical applications.