Characterization of Laves phase in Crofer 22 H stainless steel

Zheng-Wen Hsiao; Bernd Kuhn; Delphic Chen; Lorenz Singheiser; Jui-Chao Kuo; Dong-Yih Lin

doi:10.1016/j.micron.2015.04.007

Characterization of Laves phase in Crofer 22 H stainless steel

Micron. 2015 Jul:74:59-64. doi: 10.1016/j.micron.2015.04.007. Epub 2015 Apr 27.

Authors

Zheng-Wen Hsiao¹, Bernd Kuhn², Delphic Chen³, Lorenz Singheiser², Jui-Chao Kuo⁴, Dong-Yih Lin⁵

Affiliations

¹ Department of Materials Science and Engineering, National Cheng-Kung University, Tainan 701, Taiwan.
² Forschungszentrum Juelich GmbH, Institute for Energy and Climate Research (IEK), Microstructure and Properties of Materials (IEK-2), 52425 Juelich, Germany.
³ Research Center for Physical Properties and Microstructure of Metals, National Sun Yat-Sen University, Kaohsiung 804, Taiwan.
⁴ Department of Materials Science and Engineering, National Cheng-Kung University, Tainan 701, Taiwan. Electronic address: jckuo@mail.ncku.edu.tw.
⁵ Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung City 811, Taiwan.

PMID: 25974858
DOI: 10.1016/j.micron.2015.04.007

Abstract

This study investigated the effect of annealing temperature on the precipitation behavior of Crofer(®) 22 H at 600°C, 700°C, and 800°C. The grain size distribution, precipitate phase identification, and microstructure were analyzed using electron backscatter diffraction (EBSD) and energy dispersive X-ray spectroscopy (EDS). The morphology of Laves phase (Fe,Cr,Si)(2)(Nb,W) precipitates having the Cr(2)Nb structure changed from strip-like to needle-shaped as the annealing temperature was increased. The precipitates of the Laves phase also shifted from the grain boundaries to the grain interiors when the temperature was increased. However, the average grain size (150 μm) of the ferritic matrix did not significantly change at 600°C, 700°C, and 800°C for 10 h.

Keywords: Crofer 22 H; EBSD; Laves phase; Phase characterization.

Publication types

Research Support, Non-U.S. Gov't