Determination of local residual stress in an air plasma spray thermal barrier coating (APS-TBC) by microscale ring coring using a picosecond laser. (1st July 2019)

• Record Type: Journal Article
• Authors: Zhang, Xun; Li, Chun; Withers, Philip J.; Markocsan, Nicolaie; Xiao, Ping
• Is Part Of: Scripta materialia. Number 167(2019)
• Page Start: 126
• Page End: 130
• Publication Date: 2019-07-01
• Subjects: Annular hole drilling -- X-ray micro-computed tomography -- Non-destructive -- Yttria partially stabilized zirconia (YSZ); Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.03.036
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A picosecond laser for incremental annular trench cutting is combined with digital image correlation (DIC) to extend the incremental ring-core method to the profiling of residual stress in thick (>100 μm) coatings. In this case the local residual stress in a TBC is depth profiled after exposure to 1150 °C for 190 h. The topcoat was found to be in compression with an average compressive stress of −94 ± 8 MPa which is representative of the stresses that would be generated elastically on cooling from a stress-free temperature of ~970 °C. The stress profile measurements have been validated by high-energy synchrotron X-ray diffraction measurements. Graphical abstract: Unlabelled Image