About this Abstract |
Meeting |
Advances in Welding and Additive Manufacturing Research 2022
|
Symposium
|
Advances in Welding and Additive Manufacturing Research 2022
|
Presentation Title |
Effect of Spray Distance on Cold Spray Processes |
Author(s) |
Rong Gen Neo, Kaiqiang Wu, Sung Chyn Tan, Wei Zhou |
On-Site Speaker (Planned) |
Rong Gen Neo |
Abstract Scope |
Repairing metal parts using cold spray process has gained considerable attention recently. In a cold spray process, solid metallic particles in micron-size are accelerated to supersonic speed and travel over a distance before they impact on the substrate to form coatings. The standoff distance (SD) between the cold spray gun nozzle and the metal parts is usually kept small to prevent a velocity drop due to air resistance. However, during the repair process, parts with small radial feature pose a challenge to steer the gun around the parts when a small SD is used. In this study, Inconel 625 particle velocity was measured with a cold spray meter over a large range of spray distances (30 mm to 400 mm). The particle velocity was found to peak at 80 mm spray distance with an average velocity of 781 m/s. Cold spray coatings were deposited at 30 and 80 mm SDs on Inconel 625 substrate for comparison. Microhardness for the coatings were similar (521 HV for 30 mm SD and 532 HV for 80 mm SD), indicating that the particles had similar degree of deformation at the considerably different SDs. However, flexural stress of the coatings was found to be 9 % higher for the 30 mm SD than for the 80 mm SD. This is attributed to the drop of gas temperature at larger SD. The temperature at 30 mm SD was found to be 17 % higher than at 80 mm SD. The research reveals variation of gas temperature and particle velocity with spray distance and helps to optimize standoff distance in the cold spray repair process. |
Proceedings Inclusion? |
Undecided |