Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 209, Issue 15-16, Pages 5661-5668Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2009.05.031
Keywords
Femtosecond laser; Thermal barrier coating; Machining; Cooling hole; Thermal cycling; Superalloy
Ask authors/readers for more resources
Machining of cooling holes on thermal barrier coated superalloy components using a nanosecond (ns) laser generates considerable collateral damage such as recast layer, spatter and delamination of the ceramic coating. However, recent studies have suggested that these damages can be virtually eliminated by machining with femtosecond (fs) lasers. A detailed study on the microstructural characteristics of fs laser machined holes with diameters of 300 mu m and 600 mu m, generated on thermal barrier coated superalloy CMSX4 under various processing conditions has been conducted. Features examined include the shape, size and the surface finish of the hole wall. Femtosecond laser machined holes with a surface roughness of less than 2 mu m and no major collateral damage could be generated in coated samples up to a thickness of 1.5 mm. The machining was found to Cause minor ablative material removal from the top ceramic layer within 100 mu m of the outer edge of the hole. The presence of machined holes did not affect the thermal cycling life at 1100 degrees C of the coated samples. (C) 2009 Elsevier B.V. All rights reserved
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available