Phenonmenon of Cu Segregation in Cu-containing steel During Soaking at 1150 ℃

doi:10.11902/1005.4537.2019.215

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (6): 545-552 DOI: 10.11902/1005.4537.2019.215

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Phenonmenon of Cu Segregation in Cu-containing steel During Soaking at 1150 ℃

WANG Lei¹(

), DONG Junhua², HAN Da³, LIANG Jiankun¹, LI Quan¹, KE Wei⁴

1. School of Life and Health Science, Kaili University, Kaili 556011, China
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. School of Life Science, Beijing Institute of Technology, Beijing 100000, China
4. Environmental Corrosion Centre of Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

The Cu segregation in Cu-containing steel was investigated after high temperature treatment at 1150 ℃ in air for different time. It is found that Cu segregation occurred both at the interface oxide scale/steel matrix and at grain boundaries of the sub-surface of the substrate beneath the interface, which was caused by the preferential oxidation of Fe and the decarburization, thereby resulted in the sharply decrease of the cementite content near the steel surface. It also found that the Cu content in the area beneath the interface oxide scale/steel matrix for the heat treated steel is lower than that of the steel before subjecting to heat treatment.

Key words: Cu-containing steel high temperature treatment Cu segregation decarburization

Received: 17 November 2019

ZTFLH:

TG142

Fund: Doctoral Scientific Research Startup Foundation from Kaili University(BS201814);National Natural Science Foundation of China(31760191);Reform Project of Teaching Content and Curriculum System in Colleges and Universities of Guizhou Province(JG202018);Reform Project of Teaching Content and Curriculum System in Colleges and Universities of Guizhou Province(2018520134)

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

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Cite this article:

WANG Lei, DONG Junhua, HAN Da, LIANG Jiankun, LI Quan, KE Wei. Phenonmenon of Cu Segregation in Cu-containing steel During Soaking at 1150 ℃. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 545-552.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.215 OR https://www.jcscp.org/EN/Y2020/V40/I6/545

Fig.1 Optical microstructure of the Cu-containing steel

Fig.2 Optical microstructures of the steel/oxide interfaces of the test steel after treatments in air at 1150 ℃ for 5 min (a), 10 min (b), 20 min (c), 30 min (d) and 60 min (e)

Fig.3 Optical microstructures of the surface layers of the steel after treatments in reduction atmosphere at 1150 ℃ for 5 min (a), 10 min (b), 20 min (c), 30 min (d) and 60 min (e)

Fig.4 BSE image of the steel/oxide interface of the test steel after treatment for 20 min in air at 1150 ℃ (a), and the distributions of O (b), Fe (c), Cu (d), Si (e), P (f), Mn (g) and S (h)

Fig.5 BSE image of the steel/oxide interface of the test steel after treatment for 20 min in reduction condition at 1150 ℃ (a), and the distributions of O (b), Fe (c), Cu (d), Si (e), P (f), Mn (g) and S (h)

Fig.6 SEM image (a) and EDX line scannings of element Fe (b), O (c), Mn (d), Cu (e), C (f) and Si (g) at the steel/scale interface in a hot-shortness area of the steel after hot rolling in air at high temperature

Fig.7 EPMA results of Cu content in pearlite and ferrite in the Cu containing steel

Fig.8 Schematic drawings of decarburization at the steel/oxide interface and Cu precipitation induced by oxidation of Fe after high temperature treatment in air

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