Scholarlink

<p>The direct energy deposition-arc (DED-Arc) process has garnered significant attention in ship component manufacturing and remanufacturing due to its low cost, high efficiency, and design flexibility. However, components fabricated via DED-Arc in marine environments often exhibit poor geometric accuracy, suboptimal surface quality, and severe porosity. To address these challenges, this paper proposes a hybrid DED-Arc process integrated with interlayer milling, wherein controlling the interlayer milling thickness is employed as a strategy to enhance forming accuracy and reduce the porosity in DED-Arc thin-walled specimens. Results showed that under simulated marine environments, compared with the pure DED-Arc process, the layer-by-layer hybrid DED-Arc and interlayer milling process for ER316L stainless steel thin-walled specimens produced smooth and uniform sidewall geometry, a notable reduction in porosity, and refined microstructures. Mechanistically, the improvement in sidewall geometry can be attributed to the transformation of molten metal flow from rapid downward curvilinear flow to slow outward planar spreading after interlayer milling. Porosity reduction is achieved through three synergistic mechanisms: (1) milling-induced pore removal, (2) interlayer remelting-driven pore refilling, and (3) thermal energy-assisted gas escape during remelting.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of interlayer milling thickness on forming accuracy and porosity in hybrid DED-Arc with interlayer milling

  • 期刊论文

  • 发表日期：

    2025年9月22日

查看全文
  • Shenheng Hu,
  • Keyi Wang,
  • Xia Li,
  • Wenbo Du,
  • Minghui Liu

摘要

The direct energy deposition-arc (DED-Arc) process has garnered significant attention in ship component manufacturing and remanufacturing due to its low cost, high efficiency, and design flexibility. However, components fabricated via DED-Arc in marine environments often exhibit poor geometric accuracy, suboptimal surface quality, and severe porosity. To address these challenges, this paper proposes a hybrid DED-Arc process integrated with interlayer milling, wherein controlling the interlayer milling thickness is employed as a strategy to enhance forming accuracy and reduce the porosity in DED-Arc thin-walled specimens. Results showed that under simulated marine environments, compared with the pure DED-Arc process, the layer-by-layer hybrid DED-Arc and interlayer milling process for ER316L stainless steel thin-walled specimens produced smooth and uniform sidewall geometry, a notable reduction in porosity, and refined microstructures. Mechanistically, the improvement in sidewall geometry can be attributed to the transformation of molten metal flow from rapid downward curvilinear flow to slow outward planar spreading after interlayer milling. Porosity reduction is achieved through three synergistic mechanisms: (1) milling-induced pore removal, (2) interlayer remelting-driven pore refilling, and (3) thermal energy-assisted gas escape during remelting.