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Title: Phase quantification in low carbon Nb-Mo bearing steel by electron backscatter diffraction technique coupled with kernel average misorientation
Authors: Yu-Wen Chen
Yu-Ting Tsai
Po-Yen Tung
Shao-Pu Tsai
Chih-Yuan Chen
Shing-Hao Wang
Jer-Ren Yang
Contributors: 國立臺灣海洋大學:機械與機電工程學系
Keywords: Low carbon steel
Granular bainite
Nb-Mo microalloying
Electron backscattered diffraction (EBSD)
Kernel average misorientation (KAM)
Date: 2018-05
Issue Date: 2018-12-14T03:30:22Z
Publisher: Materials Characterization
Abstract: Abstract: An efficient and accurate method is developed for microstructural quantification of complex phases in a low carbon Nb-Mo bearing steel, of which optical micrographs show that it consists of granular bainite and a small amount of ferrite. Our previous work, proposing a method to measure the misorientation angles via electron backscatter diffraction (EBSD) to differentiate granular bainite and ferrite, has been reported. That method is accurate for phase quantification but laborious for the characterization process. To resolve this difficulty, in this study, EBSD combined with a kernel average misorientation (KAM) map is used for phase characterization. Comparisons are made among KAM maps with different kernel sizes (300 to 600 nm) and various step sizes (100 to 600 nm). It is found that a kernel size close to the sub-structure size of granular bainite (500 nm) is optimal for phase identification, while varied step sizes produce relatively invariant results. Therefore, KAM maps can be used for fast and reliable phase quantification, provided that an appropriate kernel size and a large step size are used.
Relation: 139 pp.49-58
Appears in Collections:[Department of Mechanical and Mechatronic Engineering] Periodical Articles

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