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EFFECT OF HEAT TREATMENT ON MAGNESIUM BASED INCLUSIONS IN LOW-CARBON STEEL

1 FENG Pei-Hsien
Co-authors:
1 ZHANG Jian 1 HWANG Weng-Sing 1 PAN Yan-Chi
Institution:
1 National Cheng Kung University, Department of Materials Science and Engineering, Tainan, Taiwan, wshwang@mail.ncku.edu.tw
Conference:
23rd International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 21 - 23, 2014
Proceedings:
Proceedings 23rd International Conference on Metallurgy and Materials
Pages:
154-158
ISBN:
978-80-87294-52-9
ISSN:
2694-9296
Published:
18th June 2014
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
242 views / 88 downloads
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Abstract

Acicular ferrite has been used to increase the toughness and strength of low-carbon alloy steel weld metals. Finely dispersed nonmetallic inclusions can serve as nucleation sites for acicular ferrite, and thus reduce the grain size and consequently improve the mechanical properties of steel. In this study, 7 ppm magnesium was added into Al-killed low-carbon steel (SS400) during secondary steelmaking to fine-tune the composition of the steel and obtain fine particles. The hot rolling process of the steel was simulated using a Gleeble 1500 thermal-mechanical simulator to investigate the relationship between heat treatment and the formation of acicular ferrite. Furthermore, the phase constitution and microstructure of SS400 were analyzed using scanning electron microscopy and electron backscatter diffraction. Finally, the optimal heat treatment of SS400 steel for forming acicular ferrite was determined.

Keywords: Acicular ferrite, Magnesium, Inclusion, Heat treatment, Low-carbon steel

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