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Zn diffusion and α-Fe (Zn) layer growth during annealing of Zn-coated B steel
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Janik, Vit, Lan, Yongjun, Beentjes, Peter, Norman, David, Hensen, Guido and Sridhar, Seetharaman (2015) Zn diffusion and α-Fe (Zn) layer growth during annealing of Zn-coated B steel. In: 5th International Conference on Hot Sheet Metal Forming of High-Performance Steel, Toronto, Canada, 31 May - 4 Jun 2015
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Official URL: http://eventegg.com/chs2-2015/
Abstract
Direct hot press forming of Zn-coated 22MnB5 steels is impeded by micro-cracks that occur in the substrate due to the presence of Zn during the forming process. A study was therefore undertaken to quantify concentration of Zn across the α-Fe(Zn) coating and on grain boundaries in the α-Fe(Zn) layer and the underlying γ-Fe(Zn) substrate after isothermal annealing of Zn-coated 22MnB5 at 1173 K (900 °C) and to link the Zn distribution to the amount and type of micro-cracks observed in deformed samples. Finite difference model was developed to describe Zn diffusion and the growth of the α-Fe(Zn) layer. The penetration of Zn into the γ-Fe(Zn) substrate after 600 seconds annealing at 1173 K (900 °C) through bulk diffusion is estimated to be 3 μm, and the diffusion depth of Zn on the γ-Fe(Zn) grain boundaries is estimated to be 6 μm, which is significantly shorter than the maximum length (15 to 50 μm) of the micro-cracks formed in the severely stressed conditions, indicating that the Zn diffusion into the γ-Fe(Zn) from the α-Fe(Zn) during annealing is not correlated to the depth of micro-cracks. On the other hand, the maximum amount of Zn present in α-Fe(Zn) layer decreases with annealing time as the layer grows and Zn oxidizes, and the amount of Zn-enriched areas inside the α-Fe(Zn) layer is reduced leading to reduced length of cracking. Solid-Metal-Induced Embrittlement mechanism is proposed to explain the benefit of extended annealing on reduced depth of micro-crack penetration into the γ-Fe(Zn) substrate.
Item Type: | Conference Item (Lecture) | ||||
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Subjects: | T Technology > TN Mining engineering. Metallurgy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
Official Date: | 2015 | ||||
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Status: | Peer Reviewed | ||||
Conference Paper Type: | Lecture | ||||
Title of Event: | 5th International Conference on Hot Sheet Metal Forming of High-Performance Steel | ||||
Type of Event: | Conference | ||||
Location of Event: | Toronto, Canada | ||||
Date(s) of Event: | 31 May - 4 Jun 2015 |
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