Plastic strain assessment of Alloy 690 heat affected zones from component mockups using KAM and GOS
2017 (English)Report (Other academic)
The plastic strain level in Alloy 690 heat affected zones (HAZs) of three component mockups have been assessed using misorientations quantified by electron backscatter diffraction (EBSD). Kernel average misorientation (KAM) and grain orientation spread (GOS) were used in this work, and both gave the same results. The plastic strain increased towards the weld interface in all mockups and reached around 0.05 logarithmic strain for two mockups, and 0.10 for the third.While GOS was straightforward to use, KAM was shown to be sensitive to measurement imprecision, and also dependent on EBSD step length, kernel design and average grain size. This work shows how these drawbacks of KAM can be overcome. The results suggest that KAM’s size dependencies can be interpreted as a dependency on the ratio between kernel length scale and the average grain size of the material.
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. , 12 p.
TRITA-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 611
nickel-base alloy, heat affected zone, plastic deformation, electron backscatter diffraction
Metallurgy and Metallic Materials
Research subject Materials Science and Engineering
IdentifiersURN: urn:nbn:se:kth:diva-202570OAI: oai:DiVA.org:kth-202570DiVA: diva2:1077630
QC 201703012017-02-282017-02-282017-03-03Bibliographically approved