Effect of dew point on hot-dip galvanizing behavior of a high-manganese TWIP steel for automotive application
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ORIGINAL PAPER
Effect of dew point on hot‑dip galvanizing behavior of a high‑manganese TWIP steel for automotive application Ting‑dong Ren1 · Wen Shi1 · Ren‑dong Liu2 · Li Lin2 · Hong‑gang Yang2 · Lin Li1 · Babar Shahzad3 Received: 1 September 2019 / Revised: 21 December 2019 / Accepted: 27 December 2019 © China Iron and Steel Research Institute Group 2020
Abstract The effect of dew points (− 50, − 10 and + 10 °C) on the galvanizing properties of a high-manganese twinning-induced plasticity (TWIP) steel was studied. Scanning electron microscopy (SEM), glow discharge optical emission spectrometry (GDOES) and X-ray photoelectron spectroscopy (XPS) were used for microscopic observation and qualitative analysis of the interfacial layer between the steel surface and the zinc layer after hot-dip galvanizing. SEM analysis results show that three different morphologies of metallic oxides are formed on the interfacial layer under the different dew points. GDOES results show that Al is present in the molten zinc, reacting with Fe on the steel surface to form Fe2Al5, which can increase the galvanizing properties. XPS results show that the valence states of Mn in the interfacial alloy layer are Mn2+ and Mn4+, and the valence states of Fe are F e0, Fe2+ and Fe3+. The experimental results show that the hot-dip galvanizing performance is the best at − 10 °C and the formation of Mn and Fe intermetallic oxides has a bad effect on hot-dip galvanizing behavior of the high-manganese TWIP steel. The types of the formed surface oxides (MnO, Mn3O4, Mn2O3, FeO, and F e2MnO4) on the surface of the steel sheet are confirmed. It can obtain the best hot-dip galvanizing performance of the high-manganese TWIP steel by controlling the dew point from − 10 to − 5 °C. Keywords High-manganese twinning-induced plasticity steel · Hot-dip galvanizing · Dew point · Glow discharge optical emission spectrometry · X-ray photoelectron spectroscopy · Surface oxide
1 Introduction In order to adapt the increasing demand of modern automobile industry on fuel efficiency, weight reduction is the preferred method without affecting the safety of the vehicle. According to the statistics [1], reducing the weight of each car by 10%, fuel consumption can be reduced by 3% to 7%. It has promoted the research on automotive body applications of high strength and ductility steel. Twinning-induced plasticity (TWIP) steel not only is characterized by high strength, high ductility and high strain hardening, but also has two advantages of high energy absorption capacity and
* Ting‑dong Ren [email protected] 1
School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
2
Ansteel Group Co., Anshan 114021, Liaoning, China
3
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China
non-low temperature brittle transition, which can improve vehicle crash safety and significantly reduce vehicle weight [2]. Hot-dip galvanizing is a cost-effective corrosion protection method used in automobile indu
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