Production of Twin Roll Cast AA6016 for Automotive Applications

摘要

Contrary to the coarse and aligned characteristics of intermetallic particles in the material produced with DC casting/hot rolling route, very fine and uniformly distributed intermetallic particles of TRC sheet have pronounced contribution to the complex straining conditions of stamping operations and failure mechanism. TRC sheet shows satisfactory performance in bending process which is unavoidable joining (such as hemming) and forming method of automotive industry. Fine intermetallic particles improve surface appearance in bending and overall bendability performance. A phenomenon, orange peeling, that deteriorates the surface appearance due to the coarse grain structure, can be avoided with much finer grain structure of TRC sheet. Not only the uniaxial tensile properties, but also complex deformation characterization technique, FLD, shows that TRC sheet has almost identical performance with that of DC cast counterpart. Supersaturated outer fibers of the strip formed upon contacting with the caster rolls and associated solidification mechanism might result in different age hardening kinetics as exposed to solution heat treatment and subsequent age hardening. This phenomenon needs further detailed studies. In connection with the same reasoning, influence of alloy chemistry on manipulating mechanical performance of TRC strips need further investigation, especially with changing Si content.