Characterization of laser powder micro-deposition of thin StelliteF wall

For laser powder micro-deposition process,the bonding between the deposited materials and the substrates is crucial to the quality of the deposited components.In order to fabricate fine thin parts with uniform thickness and good bonding strength directly,the effect of processing parameters on wall thickness uniformity and stability of the process during laser micro-deposition of metallic powder from StelliteF alloy is investigated experimentally.The observation and analysis of the cross-section and the microstructure of the deposited thin walls indicate that,the change of heat dissipation condition during deposition influences the wall thickness uniformity.Under reasonable processing parameters,thin wall parts with surface roughness(Ra) as low as 10μm,the wall thickness as thin as 0.4mm and metallurgically sound structure can be deposited directly.It indicates that laser micro-deposition of metallic powder has a bright prospect in laser surface modification of small parts and direct fabrication of fine and precise components.