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<p>Effect of laser remelting (LR) on thermal stability of microstructure/properties of Ti–6Al–4V alloy fabricated by laser powder bed fusion (LPBF) was systematically investigated. After processed by LR, the thermal stability of microstructure was increased. ‘Short rod’ and ‘coarse sheet’ grain structures appeared above 700&#xa0;°C in LPBF-Ti6Al4V samples, while the relatively uniform and fine needle-like structures still exhibited in the melted zone (MZ) and heat-affected zone (HAZ) of LRed-Ti6Al4V samples (LPBF-Ti6Al4V samples treated by LR) above 700&#xa0;°C. The thermal stability of surface hardness was enhanced. The coarsening of <i>β</i> phase was effectively suppressed by LR, resulting in the temperature at which hardness begins to decline in LR samples being 150&#xa0;°C higher than LPBF samples. The thermal stability of corrosion resistance was raised. Influenced by the inhibitory effect of LR on the nucleation and growth of the <i>β</i> phase, the corrosion rate of LRed-Ti6Al4V samples were consistently lower than LPBF-Ti6Al4V samples at the same temperature.</p>

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Effect of Laser Remelting on the Thermal Stability of Microstructure/Properties of Ti–6Al–4V Alloy Fabricated by Laser Powder Bed Fusion

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Yangyang Deng,
  • Yang Yang,
  • Yuxing Zhan,
  • Yueyang Liu

摘要

Effect of laser remelting (LR) on thermal stability of microstructure/properties of Ti–6Al–4V alloy fabricated by laser powder bed fusion (LPBF) was systematically investigated. After processed by LR, the thermal stability of microstructure was increased. ‘Short rod’ and ‘coarse sheet’ grain structures appeared above 700 °C in LPBF-Ti6Al4V samples, while the relatively uniform and fine needle-like structures still exhibited in the melted zone (MZ) and heat-affected zone (HAZ) of LRed-Ti6Al4V samples (LPBF-Ti6Al4V samples treated by LR) above 700 °C. The thermal stability of surface hardness was enhanced. The coarsening of β phase was effectively suppressed by LR, resulting in the temperature at which hardness begins to decline in LR samples being 150 °C higher than LPBF samples. The thermal stability of corrosion resistance was raised. Influenced by the inhibitory effect of LR on the nucleation and growth of the β phase, the corrosion rate of LRed-Ti6Al4V samples were consistently lower than LPBF-Ti6Al4V samples at the same temperature.