Product Code: ICAL08_105

An Investigation on Porosity in Laser Metal Deposition
Authors:
Gary K.L. Ng, Simtech; Singapore Singapore
Guijun Bi, Simtech; Singapore Singapore
Hongyu Zheng, Singapore Institute of Manufacturing Technology (Simtech); Singapore Singapore
Presented at ICALEO 2008

Laser metal deposition is a process that involves laser processing of fine metal powders into forming three-dimensional structures. Its versatility offers immense opportunities in numerous applications. However, the deposited material using the powder blown process is often plagued by inherent defects such as porosity which cannot be tolerated in certain applications. The origin of the gas porosity observed in laser deposited material is not entirely certain, and hence it presents difficulties in tackling this problem. In this work, a comprehensive investigation of porosity is carried out using gas atomised nickel-base powder.