Wire Arc Additive manufacturing (WAAM) is the new alternative technique to the traditional manufacturing technique for the fabrication of metal components. In this work, Ti6Al4V has been deposited using WAAM process. One of the major challenges in depositing the Ti6Al4V using WAAM is to provide the proper shielding to prevent the oxidation and intermetallic formation. In the current work trailing shield is used to protect to deposited beads. Multiple layers have been deposited on single track along Z (vertical) axis. Temperature of the former layer is ensured below 50 °C before subsequent layer. The trailing shielding was found very effective, and thus no de-colorization was observed on the beads. Macrostructure, microstructure and hardness studies have been done to examine the deposited part. Long elongated grains were observed during the microstructural study. Hardness was found almost uniform across all the layers. Minor increase was noticed from first pass towards final pass. This may attribute to the softening of layers during subsequent layer deposition. FESEM has been done to examine the microstructural feature such as micro-porosity, inclusions and precipitates.

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Some Preliminary Studies on Wire Arc Additive Manufacturing of Ti6Al4V Alloy

  • Kaleru Sai Kiran,
  • Ravi Shanker Vidyarthy,
  • Suresh Kumar Reddy Narala,
  • Kishore Babu Nagumothu

摘要

Wire Arc Additive manufacturing (WAAM) is the new alternative technique to the traditional manufacturing technique for the fabrication of metal components. In this work, Ti6Al4V has been deposited using WAAM process. One of the major challenges in depositing the Ti6Al4V using WAAM is to provide the proper shielding to prevent the oxidation and intermetallic formation. In the current work trailing shield is used to protect to deposited beads. Multiple layers have been deposited on single track along Z (vertical) axis. Temperature of the former layer is ensured below 50 °C before subsequent layer. The trailing shielding was found very effective, and thus no de-colorization was observed on the beads. Macrostructure, microstructure and hardness studies have been done to examine the deposited part. Long elongated grains were observed during the microstructural study. Hardness was found almost uniform across all the layers. Minor increase was noticed from first pass towards final pass. This may attribute to the softening of layers during subsequent layer deposition. FESEM has been done to examine the microstructural feature such as micro-porosity, inclusions and precipitates.