Influence of κ-carbide interface structure on the formability of lightweight steels

Lu, W.J. and Qin, R.S. (2016). Influence of κ-carbide interface structure on the formability of lightweight steels. Materials & Design, 104 pp. 211–216.

DOI: https://doi.org/10.1016/j.matdes.2016.05.021

Abstract

κ-carbide (κ) in high aluminium (Al) steels is grown from austenite (γ) via γ → γ + κ or γ → α + κ (α represents ferrite), and is a lamellar structure. This work demonstrates that the formability of high Al lightweight steels is affected by the lattice misfit and interface shape between κ and matrix. The cold workability can be improved by either to change the steel chemical constitution or to implement an electro-thermo-mechanical process. For ferrite-matrix-based high Al steel, electric-current promotes the spheroidization and refinement of κ structure and reduces volume fraction of κ phase. This retards the crack nucleation and propagation, and hence improves the materials formability. The observation is caused by a direct effect of electric-current rather than side effects.

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• Item ORO ID
• 46243
• Item Type
• Journal Item
• ISSN
• 0261-3069
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Not Set	EP/J011460/2	EPSRC
  Not Set	EP/L00030X/1	EPSRC
  Not Set	NA150320	The Royal Society Newton Advanced Fellowship

• Keywords
• cracking; microstructure; κ-carbide; lightweight steel
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 2016 Elsevier
• Depositing User
• Rongshan Qin