Laser-directed energy deposition (LDED) is a promising additive manufacturing (AM) technique for producing components from Al7075 alloy due to its potential for enhancing design flexibility and reducing material waste. With its high strength, improved fatigue characteristics, corrosion resistance and regulated machinability, Al7075 is the most popular 7xxx series alloy and is ideal for use in the aerospace and automotive industries. Processing of high strength aluminium alloy, i.e. Al7075 became difficult due to its poor weldability and suspension to solidification cracking during the process. This study investigates the influence of various process parameters, i.e. laser power, scan speed and powder flow rate on the formation of porosity and balling effects during LDED of Al7075 alloy. Using Formally LDED machine, 10 × 10 mm3 cube samples were fabricated by adopting L9 orthogonal array and studied the effect of process parameters on printability. With lower laser power, i.e. 300, 350 and 400 W, the fabrication of Al7075 alloy became difficult and observed the complete balling on the surface. With increasing laser power and adopting a new set of parameters, i.e. 550, 600 and 650 W of laser power, the printability has been improved. The optimum conditions like 650 W laser power, 700 mm/min scan speed and 0.8 g/min of powder flow rate were achieved to print efficient cubes.

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Effect of Process Parameters on Porosity and Balling of Al7075 Alloy Fabricated by Laser-Directed Energy Deposition

  • Sai Kumar Balla,
  • Manjaiah Mallaiah,
  • N. Selvaraj

摘要

Laser-directed energy deposition (LDED) is a promising additive manufacturing (AM) technique for producing components from Al7075 alloy due to its potential for enhancing design flexibility and reducing material waste. With its high strength, improved fatigue characteristics, corrosion resistance and regulated machinability, Al7075 is the most popular 7xxx series alloy and is ideal for use in the aerospace and automotive industries. Processing of high strength aluminium alloy, i.e. Al7075 became difficult due to its poor weldability and suspension to solidification cracking during the process. This study investigates the influence of various process parameters, i.e. laser power, scan speed and powder flow rate on the formation of porosity and balling effects during LDED of Al7075 alloy. Using Formally LDED machine, 10 × 10 mm3 cube samples were fabricated by adopting L9 orthogonal array and studied the effect of process parameters on printability. With lower laser power, i.e. 300, 350 and 400 W, the fabrication of Al7075 alloy became difficult and observed the complete balling on the surface. With increasing laser power and adopting a new set of parameters, i.e. 550, 600 and 650 W of laser power, the printability has been improved. The optimum conditions like 650 W laser power, 700 mm/min scan speed and 0.8 g/min of powder flow rate were achieved to print efficient cubes.