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COUPLING OF MATERIALS IN DIRECT LASER DEPOSITION

Develop ultra-high temperature materials

The main advantage of Direct Laser Deposition, (DLD) is its flexibility in precision repair, and in depositing tailored materials to enhance functionality such as resistance to wear, corrosion or high temperature.

The aim of this research is to enhance high temperature oxidization resistance of current engineering metals through laser cladding of High Entropy Alloy (HEA) coatings.

The Hub has successfully cladded AlxCoCrFeNi (x=0.3, 0.6 and 0.85) HEA system on both 253MA stainless steel, and Inconel 600 superalloy using coaxial DLD from elemental powders. This demonstrated for the first time, the feasibility of additively manufacturing HEA coatings with a controllable level of dilution. These coatings were subjected to high thermal exposure (i.e. 1000°C for up to 100 h) and revealed improved oxidation resistance with increasing Aluminum content. Interface diffusion was also limited between the HEA coatings and substrate.