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<p>Laser direct energy deposition (LDED) offers high material utilization and efficient hybrid manufacturing. However, limited research exists on the effects of interlayer dwell time (IDT) and milling speed in LDED-produced Inconel 718. This experiment investigated the influence of interlayer dwell time on the microstructure and mechanical properties of Inconel 718 specimens fabricated by LDED and also studied the effects of different milling speeds on surface roughness and milling force. This study reveals that increasing IDT enhances hardness by 5.42% and elongation by 15.25%, due to higher cooling rates and refined dendrites. Additionally, surface roughness first decreases and then increases with rising milling speed, while milling force shows an inverse trend. In this study, by revealing the regulation law of IDT on the microstructure and properties of the deposited state of Inconel 718, and clarifying the non-monotonic influence of milling speed on surface quality and cutting force, the optimal process window of additive—subtractive composite forming was determined, and the integrated preparation of high-performance and high surface quality components was achieved.</p>

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Microstructure and Mechanical Properties of Inconel 718 in Hybrid Manufacturing by Interlayer Dwell Time

  • 期刊论文

  • 发表日期：

    2026年2月19日

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  • Yuying Yang,
  • Yongqian Yang,
  • Mingdong Yi,
  • Zhaoqiang Chen,
  • Guangchun Xiao,
  • Ziyu Zhang,
  • Jiakang Zong,
  • Chonghai Xu

摘要

Laser direct energy deposition (LDED) offers high material utilization and efficient hybrid manufacturing. However, limited research exists on the effects of interlayer dwell time (IDT) and milling speed in LDED-produced Inconel 718. This experiment investigated the influence of interlayer dwell time on the microstructure and mechanical properties of Inconel 718 specimens fabricated by LDED and also studied the effects of different milling speeds on surface roughness and milling force. This study reveals that increasing IDT enhances hardness by 5.42% and elongation by 15.25%, due to higher cooling rates and refined dendrites. Additionally, surface roughness first decreases and then increases with rising milling speed, while milling force shows an inverse trend. In this study, by revealing the regulation law of IDT on the microstructure and properties of the deposited state of Inconel 718, and clarifying the non-monotonic influence of milling speed on surface quality and cutting force, the optimal process window of additive—subtractive composite forming was determined, and the integrated preparation of high-performance and high surface quality components was achieved.