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Title: 3D characterization of trans- and inter-lamellar fatigue crack in (α + β) Ti alloy

This paper presents a three dimensional image processing strategy that has been developed to quantitatively analyze and correlate the path of a fatigue crack with the lamellar microstructure found in Ti-6246. The analysis is carried out on X-ray microtomography images acquired in situ during uniaxial fatigue testing. The crack, the primary β-grain boundaries and the α lamellae have been segmented separately and merged for the first time to allow a better characterization and understanding of their mutual interaction. This has particularly emphasized the role of translamellar crack growth at a very high propagation angle with regard to the lamellar orientation, supporting the central role of colonies favorably oriented for basal 〈a〉 slip to guide the crack in the fully lamellar microstructure of Ti alloy. - Highlights: • 3D tomography images reveal strong short fatigue crack interaction with α lamellae. • Proposed 3D image processing methodology makes their segmentation possible. • Crack-lamellae orientation maps show prevalence of translamellar cracking. • Angle study comforts the influence of basal/prismatic slip on crack path.
Authors:
 [1] ;  [1] ;  [2]
  1. Institute of Applied Computer Science, Lodz University of Technology (Poland)
  2. School of Materials, University of Manchester (United Kingdom)
Publication Date:
OSTI Identifier:
22403607
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 98; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPUTERIZED TOMOGRAPHY; CRACK PROPAGATION; CRACKS; FATIGUE; GRAIN BOUNDARIES; IMAGE PROCESSING; IMAGES; LAMELLAE; MATERIALS TESTING; ORIENTATION; SLIP; THREE-DIMENSIONAL LATTICES; TITANIUM ALLOYS; X RADIATION