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Overcoming the drawbacks of plastic strain estimation based on KAM
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).ORCID iD: 0000-0002-2641-7838
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).ORCID iD: 0000-0003-1498-5691
2018 (English)In: Ultramicroscopy, ISSN 0304-3991, E-ISSN 1879-2723, Vol. 184, p. 156-163Article in journal (Refereed) Published
Abstract [en]

Plastic strain estimation using electron backscatter diffraction (EBSD) based on kernel average misorientation (KAM) is affected by random orientation measurement error, EBSD step length, choice of kernel and average grain size. These sensitivities complicate reproducibility of results between labs, but it is shown in this work how these drawbacks can be overcome. The modifications to KAM were verified against a similar misorientation metric based on grain orientation spread (GOS), which does not show sensitivity to these factors. Both metrics were used in parallel to estimate the plastic strain distribution in Alloy 690 heat affected zones from component mockups, and showed the same results where the grain size was correctly compensated for.

Place, publisher, year, edition, pages
Elsevier B.V. , 2018. Vol. 184, p. 156-163
Keywords [en]
Electron backscatter diffraction, Heat affected zone, Kernel average misorientation, Nickel-base alloy, Plastic deformation, Backscattering, Corrosion, Diffraction, Electron diffraction, Grain size and shape, Average grain size, Electron back scatter diffraction, Kernel average misorientation (KAM), Mis-orientation, Nickel base alloys, Random orientations, Reproducibilities, Strain distributions
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-216802DOI: 10.1016/j.ultramic.2017.08.013ISI: 000415650200018Scopus ID: 2-s2.0-85029088686OAI: oai:DiVA.org:kth-216802DiVA, id: diva2:1162682
Note

Export Date: 24 October 2017; Article; CODEN: ULTRD; Correspondence Address: Shen, R.R.; Department of Solid Mechanics, KTH Royal Institute of Technology, Teknikringen 8D, Sweden; email: rshen@kth.se; Funding details: Vattenfall; Funding text: The authors wish to extend their gratitude to Vattenfall, Fortum and Uniper who funded this work, and to the Electric Power Research Institute (EPRI) and Torsten Pedersen at Ringhals AB for supplying the mockups used in this work. QC 20171205

Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2018-02-15Bibliographically approved

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Shen, Rickard RuiciEfsing, Pål

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