Differential speed rolling of twin-roll-cast 6xxx al alloy strips and its influence on the sheet formability

Seong Guk Son, Hong Kyu Kim, Jae Hyung Cho, Hyung Wook Kim, Jae Chul Lee

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We demonstrate the feasibility of a technique that combines twin-roll strip casting, asymmetric rolling, and subsequent heat treatment, in obtaining Al alloy sheets with high-strength/high-formability. The precipitation- hardening Al alloy sheet thus obtained exhibited an excellent formability ($\bar r$= 1.20, Δr = 0.17) and mechanical properties (σTS = 265 MPa, ε = 35%), which cannot be readily obtained via the conventional route based on direct-chill casting and heavy rolling operation. In this study, we examined the effects of the various process conditions used at different stages of the process that contribute to the development of specific textures. Simulation studies based on the generalized spherical harmonic series expansion method and the viscoplastic self-consistent (VPSC) model were conducted to arrive at a comprehensive understanding of the factors associated with the high formability realized in Al alloy sheet. It was found that specific textures evolved via twin-roll strip casting, asymmetric rolling, and heat treatment canceled out the anisotropic characteristics of the individual textures, resulting in the high sheet formability.

Original language English 108-117 10 Metals and Materials International 22 1 https://doi.org/10.1007/s12540-015-5255-3 Published - 2016 Jan 1

Keywords

• aluminum alloys
• casting
• deformation
• rolling
• texture

ASJC Scopus subject areas

• Condensed Matter Physics
• Mechanics of Materials
• Metals and Alloys
• Materials Chemistry

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