Analysis on Cracking Phenomenon of a Hot-rolling Cu-bearing Weathering Steel

doi:10.11902/1005.4537.2021.261

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (5): 845-850 DOI: 10.11902/1005.4537.2021.261

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Analysis on Cracking Phenomenon of a Hot-rolling Cu-bearing Weathering Steel

WANG Lei¹(

), DONG Junhua², GU Huaizhang¹, KE Wei³

^1.School of Life and Health Science, Kaili University, Kaili 556011, China
^2.Shenyang National Laboratory for Matericals Science, Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Environmental Corrosion Research Center for Materials, Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

The cracking phenomenon of a hot-rolled Cu-bearing weathering steel was analyzed by means of micromorphology observation and EPMA surface examination. The distribution characteristics of Mn and S in the hot-rolled Cu-bearing steel and the formed oxide scale are preliminarily assessed, the different enrichment characteristics of Cu-rich phase in copper-bearing steels before and after hot-rolling are comparatively analyzed, and three modes of cracking of hot-rolled Cu bearing weathering steel are put forward. With the synergistic action of hot rolling stress, the grain boundary oxidation, internal oxidation of steel at grain boundary and the enrichment of Cu rich phase in the crack will promote the further serious cracking of the steel.

Key words: Cu-containing steel cracking Cu rich phase steel/scale interface

Received: 27 September 2021

ZTFLH:

TG142

Fund: Doctoral Start Fund of Kaili University(BS201814);National Natural Science Foundation of China(31760191)

Corresponding Authors: WANG Lei E-mail: 2015163582@qq.com

About author: WANG Lei, E-mail: 2015163582@qq.com

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Cite this article:

WANG Lei, DONG Junhua, GU Huaizhang, KE Wei. Analysis on Cracking Phenomenon of a Hot-rolling Cu-bearing Weathering Steel. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 845-850.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.261 OR https://www.jcscp.org/EN/Y2022/V42/I5/845

Fig.1 Image of surface crazing on the steel corner

Fig.2 Optical microstructure of the Cu-containing weathering steel center (a) and surface crazing on the steel corner (b, c) and SEM images of mircrostructure of the steel

Fig.3 Optical microstructures of steel surface crazing (a) and the detail of the selected rectangle area in Fig.3a (b)

Fig.4 Optical microstructures (a, b) and SEM images (c, d) of steel surface crazing (a, c) and the detail of the selected rectangle area in Fig.4a (b) and Fig.4c (d)

Fig.5 BSE images of cracked sample after hot rolling (a) and non-cracked sample (b) and the distribution of O, Fe, Cu, Mn and S

Fig.6 Images of Cu rich phase in penetrating crack: distribution of Cu in area A (a), optical microstructure (area A in Fig.6a) (b) and SEM image of area A in Fig.6a (c)

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