Effect of oxide scale structure on shot-blasting of hot-rolled strip steel

Abstract

Background The effect of oxide scale composition of hot-rolled strip (Q235) on shot blasting is studied in this article. The properties of the oxide scale on the strip surface change during storage. The shot blasting is an important on-line acid-less descaling technology. The effect of shot blasting is affected by many factors, among which the composition of oxide scale may play an important role. However, there are few studies on the relationship between the oxide layer content and the descaling effect. Methods The morphologies of oxide scales at different storage times are observed by scanning electron microscopy (SEM), and the compositions are analyzed by X-ray diffraction. These strips are then shot blasted and descaled with different amounts of abrasive, and the descaling effects are compared by SEM. Results The results show that the eutectoid structure Fe3O4/Fe in the oxide scale will gradually transform into Fe3O4. In the case of short storage time, the content of the eutectoid structure is high, and it is difficult to remove the oxide scale. While the strip with a long storage time has no eutectoid structure Fe3O4/Fe and FeO, it is easy to remove the oxide scale during the shot blasting process. The composition of the oxide scale has a significant effect on the effect of shot blasting, and it provides significant guidance to the optimization of the descaling process parameters.

Publication DOI: https://doi.org/10.7717/peerj-matsci.9
Divisions: College of Engineering & Physical Sciences > Mechanical Engineering & Design
Additional Information: © 2020 Wang et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ Materials Science) and either DOI or URL of the article must be cited.
PURE Output Type: Article
Published Date: 2020-10-01
Accepted Date: 2020-09-03
Authors: Wang, Xiaochen
Ai, Rui
Yang, Quan
Wang, Shang
Zhang, Yanjie
Meng, Yingying
Ma, Xianghong (ORCID Profile 0000-0003-4957-2942)

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