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Three-dimensional analysis of coalesced bainite using FIB tomography

By E. Keehan, L. Karlsson, H. K. D. H. Bhadeshia, Mattias Thuv and Esab Ab


A coarse grained constituent recently discovered in high strength steel weld metals – Coalesced Bainite – was investigated with a serial section procedure for three-dimensional (3D) analysis using Focused Ion Beam (FIB) milling. Image planes of a coalesced bainite grain, 0.4 µm apart were acquired using the FIB. The data collected was then used to create a 3D model of the coalesced bainite grain. The reconstruction, revealed the grain was large chunky in all three dimensions which was greater than 20 µm in length. Correlations were made between the 3D reconstruction and micrographs of the same coalesced bainite grain recorded using Field Emission Gun Scanning Electron Microscopy and Light Optical Microscopy to allow an understanding in 3D when making future interpretations using the latter characterisation techniques

Year: 2010
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