Scholarlink

In laser-based additive manufacturing, surface modification to enhance corrosion resistance, wear performance, and hardness has become a prominent topic of discussion. However, these properties depend upon the microstructure and precipitation evolved during the solidification of laser-directed energy deposited Inconel 718 (L-DEDed). The cooling rate affects the microstructure and phase transformation during laser remelting. Thermal history was captured using Infra-red camera during laser remelting to determine the cooling rate. Equiaxed grains and a lower percentage of Laves phase were observed for an accelerated cooling rate. Furthermore, surface roughness for various laser parameters was investigated. The result shows a decrease in surface roughness with reduced scanning speed at constant laser power. Also, porosity in the L-DEDed samples was examined utilizing a scanning electron microscope (SEM). It is observed that porosity in the L-DEDed samples was reduced after laser remelting. This work emphasizes the significance of laser remelting, which enhances the clad quality and refines the microstructure to strengthen the L-DEDed Inconel 718 samples.

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 Laser Remelting on Microstructure, Porosity and Surface Roughness of Laser Direct Energy Deposited Inconel 718

  • 会议论文

  • 发表日期：

    2025年

查看全文
  • Manik A. Patil,
  • Dhananjay M. Kulkarni,
  • Biswajit Das,
  • Digvijay G. Bhosale

摘要

In laser-based additive manufacturing, surface modification to enhance corrosion resistance, wear performance, and hardness has become a prominent topic of discussion. However, these properties depend upon the microstructure and precipitation evolved during the solidification of laser-directed energy deposited Inconel 718 (L-DEDed). The cooling rate affects the microstructure and phase transformation during laser remelting. Thermal history was captured using Infra-red camera during laser remelting to determine the cooling rate. Equiaxed grains and a lower percentage of Laves phase were observed for an accelerated cooling rate. Furthermore, surface roughness for various laser parameters was investigated. The result shows a decrease in surface roughness with reduced scanning speed at constant laser power. Also, porosity in the L-DEDed samples was examined utilizing a scanning electron microscope (SEM). It is observed that porosity in the L-DEDed samples was reduced after laser remelting. This work emphasizes the significance of laser remelting, which enhances the clad quality and refines the microstructure to strengthen the L-DEDed Inconel 718 samples.