Dependence of texture development on the grain size of tertiary oxide scales formed on a microalloyed steel

SURFACE & COATINGS TECHNOLOGY

卷:272

Article

Yu, Xianglong^1,2  Jiang, Zhengyi¹  Zhao, Jingwei¹  Wei, Dongbin^1,3  Zhou, Ji²  Zhou, Cunlong⁴ 

[1] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2522, Australia

[2] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

[3] Univ Technol Sydney, Sch Elect Mech & Mechatron Syst, Sydney, NSW 2007, Australia

[4] Taiyuan Univ Sci & Technol, Shanxi Prov Key Lab Met Device Design & Theory, Shanxi 030024, Peoples R China

关键词: Grain size;    Orientation;    EBSD;    Oxide scale;    Microalloyed steel;   

DOI  :  10.1016/j.surfcoat.2015.04.026

来源: Elsevier

【 摘 要 】

Both orientational and geometrical characteristics of grains in tertiary oxide scales have been quantitatively investigated using the electron backscatter diffraction (EBSD) technique. Phase and orientation mappings demonstrate that the {001} planes of magnetite and the {0001} planes of hematite are parallel to the direction of oxide growth. Pole figures (PFs) as scattering plots clearly display the direct correlation between the orientations and microstructure sites of magnetite grains. Magnetite grains develop a strong rotated cube texture component that shifts to the {100}< 210 > component, whereas those with the grain size of 1-5 mu m develop the {001}< 100 > cube texture component. The refined magnetite grains surrounding the abnormal ones can be a combined process, including magnetite pro-eutectoid during hot rolling and cooling and re-oxidation during air-cooling. Our findings offer insights toward further understanding of the link between the geometrical and orientation parameters of grains with respect to the deformation behaviour of oxide scales formed at elevated temperatures. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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