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.

Viewing alternatives

Metrics

Item Actions

Export

You can export this page using these formats Digital Object Identifier - DOI