A round robin EBSD measurement for quantitative assessment of small plastic strain

Crystal orientation measurements using electron backscatter diffraction (EBSD) have been utilized to quantify plastic strain. However, detectability and accuracy of quantification of the plastic strain were not clear. In this study, a round robin measurement using deformed Type 316 stainless steel s...

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Bibliographic Details
Published in:	Materials characterization Vol. 170; p. 110662
Main Authors:	Kamaya, Masayuki, Sakakibara, Yohei, Yoda, Rika, Suzuki, Seiichi, Morita, Hirobumi, Kobayashi, Daisuke, Yamagiwa, Kenta, Nishioka, Tomoya, Maekawa, Yuya, Tanakamaru, Tempei, Nagashima, Hikaru, Ohtani, Toshihiro
Format:	Journal Article
Language:	English
Published:	Elsevier Inc 01-12-2020
Subjects:	Accuracy EBSD Plastic strain Round robin measurement Smoothing filter Stainless steel Accuracy Smoothing filter Stainless steel EBSD Plastic strain Round robin measurement
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Summary:	Crystal orientation measurements using electron backscatter diffraction (EBSD) have been utilized to quantify plastic strain. However, detectability and accuracy of quantification of the plastic strain were not clear. In this study, a round robin measurement using deformed Type 316 stainless steel specimens was launched between 11 organizations using the same specimens. The magnitude of induced plastic strain was 0.25%–10.28%. Two kinds of misorientation parameters, the local misorientation and intra-grain misorientation, were quoted as the measure of the plastic strain. The intra-grain misorientation exhibited a clearer correlation with the degree of plastic strain than the local misorientation did. It was found that the EBSD measurement could detect the plastic strain of more than 1%. It was shown that the variation of the misorientation parameters between the organizations largely depended on the accuracy of crystal orientation identification, which was quantified by the background noise Bn. The error could be reduced by applying the smoothing filter. The EBSD measurements were concluded to be capable of quantifying the degree of plastic strain with accuracy of 0.5% for the strain less than 2%. •EBSD measurements of deformed stainless steel by 11 organizations.•EBSD measurement could detect the plastic strain of more than 1%.•Degree of plastic strain could be identified with accuracy of 0.5%.
ISSN:	1044-5803 1873-4189
DOI:	10.1016/j.matchar.2020.110662