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| Structure and Adhesion of Oxide Scales on Casting Billet of 304 and 430 Stainless Steels |
SUN Qiongqiong1, JIA Xiquan1, XU Zhenlin1( ), HE Yizhu1, FAN Guangwei2, ZHANG Wei2, LI Huan1 |
1. School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243032, China
2. State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel (Group) Co., Ltd., Taiyuan 030003, China |
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Cite this article:
SUN Qiongqiong, JIA Xiquan, XU Zhenlin, HE Yizhu, FAN Guangwei, ZHANG Wei, LI Huan. Structure and Adhesion of Oxide Scales on Casting Billet of 304 and 430 Stainless Steels. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1649-1655.
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Abstract The structure and composition of oxide scales formed on casting billets of 304 austenitic and 430 ferritic stainless steel after being held in air at 1240oC for 4 h were characterized by means of field emission scanning electron microscope, energy dispersive spectroscopy and X-ray diffractometer. The adhesive strength between the oxide scale and the matrix was assessed via 3D micrometer scratch. The oxidation mechanism of the steels in actual working condition was discussed. The results show that the oxidation kinetics of the two stainless steels follow a parabolic low, and the oxidation rate of 430 stainless steel is significantly higher than that of 304 stainless steels. The oxidation products of the two stainless steels have a typical three-layered structure: i.e. the oxide scale composed of an outer layer and an inner layer, as well as an internal oxidation layer beneath the outer oxide scale. But the morphologies of the inner layer of oxide scale and internal oxidation layer for the two stainless steels are different. The inner layer of oxide scale of 304 stainless steel is relatively dense, while there exist obvious pores and cracks in the inner layer of oxide scale of 430 stainless steel, which is conducive to the inward diffusion of oxygen, so that accelerates the oxidation process. The internal oxidation layer of 304 stainless steel is mainly distributed as scattered blocks; while that of 430 stainless steel is distributed as continuous root-like shape, which enhances the adhesion between the oxide scale and the matrix.
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Received: 28 December 2023
32134.14.1005.4537.2023.397
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| Fund: Major Scientific and Technological Projects in Shanxi Province(20181101016);National Undergraduate Training Program for Innovation and Entrepreneurship(202010360020) |
Corresponding Authors:
XU Zhenlin, E-mail: xzl2015@ahut.edu.cn
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