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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 (2016) Zn diffusion and α-Fe(Zn) layer growth during annealing of Zn-coated B steel. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 47 (1). pp. 400-411. doi:10.1007/s11661-015-3203-y
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Official URL: http://dx.doi.org/10.1007/s11661-015-3203-y
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: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TN Mining engineering. Metallurgy | ||||||
| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||||
| Library of Congress Subject Headings (LCSH): | Steel -- Brittleness, Annealing of metals -- Research | ||||||
| Journal or Publication Title: | Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science | ||||||
| Publisher: | Springer New York LLC | ||||||
| ISSN: | 1073-5623 | ||||||
| Official Date: | January 2016 | ||||||
| Dates: |
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| Date of first compliant deposit: | 4 April 2016 | ||||||
| Volume: | 47 | ||||||
| Number: | 1 | ||||||
| Page Range: | pp. 400-411 | ||||||
| DOI: | 10.1007/s11661-015-3203-y | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Funder: | Tata Motors, Warwick Manufacturing Group |
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