Aging precipitation behavior of Cu-rich particles of low-carbon Cu-bearing medium and heavy steel plate

doi:10.13251/j.issn.0254-6051.2023.02.015

Abstract

Abstract: A low-carbon Cu-bearing medium and heavy steel plate was aged at 680 ℃ for different time (15, 30, 45, 75, 90, 120 min). The precipitation and growth mechanism of Cu-rich particles at different positions of medium and heavy steel plate were analyzed by field emission scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS). The results show that after aging treatment, the Cu-rich particles on surface and in core of the tested steel plate are spherical or short rod-shaped, and the size is mainly in the range of 5-60 nm, but the average size of Cu-rich particles in the core is larger than that on the surface. With the increase of aging time, the Cu-rich particles on the surface and in the core grow at the same time, showing a trend of the average size increasing and the total number of particles decreasing. Based on the theoretical calculation, the change of average size of Cu-rich particles satisfies the Ostwald ripening mechanism, and the growth rate of Cu-rich particles in the core is smaller than that on the surface.

Key words: Cu-bearing steel, medium and heavy steel plate, aging, Cu-rich phase, Ostwald ripening

CLC Number:

TG142.33

Sun Mingxuan, Meng Li, Zhang Ning, Zhang Bo, Liang Fengrui, Luo Xiaobing. Aging precipitation behavior of Cu-rich particles of low-carbon Cu-bearing medium and heavy steel plate[J]. Heat Treatment of Metals, 2023, 48(2): 94-102.

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