Effects of deposition variables on molten pool temperature during laser engineered net shaping of Inconel 718 superalloy

Zhichao Liu, Tao Li, Fuda Ning, Weilong Cong, Hoyeol Kim, Qiuhong Jiang, Hongchao Zhang

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The molten pool temperature during laser engineered net shaping (LENS) could directly affect the microstructure and phase compositions of materials in the molten pool, thereby affecting the mechanical properties of the fabricated parts. To achieve a well-built solid structure, the research on fundamentals and methods of molten pool thermal behavior monitoring is of great significance. Using a high-resolution infrared camera, this paper realized real-time temperature tracking of Inconel 718 deposition in the LENS process. The effects of deposition variables, such as laser power and scanning speed, on the molten pool temperature and cooling rate have been investigated. In addition, the effects of the molten pool temperature on the molten pool depth and dendrite arm spacing (DAS) have been analyzed. The results suggest that the molten pool temperature increases with increasing of the laser power while it drops first and then rises with increasing of the scanning speed. The molten pool temperature increases nonlinearly with increasing of the number of layers during the material deposition process.

Original languageEnglish
Pages (from-to)969-976
Number of pages8
JournalInternational Journal of Advanced Manufacturing Technology
Volume102
Issue number1-4
DOIs
StatePublished - May 19 2019

Keywords

  • Inconel 718
  • Infrared camera
  • Laser engineered net shaping
  • Molten pool temperature measurement

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