Fine structure characterization of austenitic stainless steel phase
JIN Chuan-wei1, ZHANG Ke1, WU Yuan-yuan1, XU Feng2
1. Institute of Research of Iron and Steel, Jiangsu Province and Sha Steel, Zhangjiagang 215625, China; 2. Changshu Institute of Technology, Changshu 215500, China
Abstract：The hot rolling 316L stainless steel was selected as the research object. The main phases were firstly investigated by X-ray diffraction (XRD). Then the existence of χ phase was confirmed by the selection area electron diffraction (SAED) and high resolution image functions of transmission electron microscopy (TEM). Transmission electron backscattered diffraction (t-EBSD) was used to characterize the distribution of all phases. The results were compared with those obtained by conventional electron backscatter diffraction (EBSD), and the distribution characterization of χ phase was accurately shown. The results indicated that the microstructure was mainly composed of austenite matrix and banded structure. The banded structure mainly contained σ phase as well as a few ferritic and austenite phases. The χ phase existed in both banded structure and austenite matrix. Moreover, both χ phase and σ phase were rich in Fe, Cr and Mo elements.
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