Investigations on the Hot Stamping of AW-7921-T4 Alloy Sheet

Figure 6

(a) Hardness of the side-wall “smiley” prototype samples following 2 weeks of storage, as well as after subsequent 1-step and 3-step paint baking. HF + DQ refers to hot forming and subsequent die quenching. (b) DSC curves of AA7921 in W-temper, T4-temper, and hot stamping followed by 2 weeks of natural ageing and after two different subsequent paint baking procedures (1-step and 3-step paint baking (1- and 3-SPB)). These DSC curves compared with the DSC curve of AA7921 in the T6 condition.

(a)

(b)