Stress-Corrosion Cracking Evaluation of Hot-Stamped AA7075-T6 B-Pillars

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Stress-Corrosion Cracking Evaluation of Hot-Stamped AA7075-T6 B-Pillars

Wright, David / Henshaw, John / Harrison, Nia R. / Luckey, S. George

High-strength aluminum alloys such as 7075 can be formed using advanced manufacturing methods such as hot stamping. Hot stamping utilizes an elevated temperature blank and the high pressure stamping contact of the forming die to simultaneously quench and form the sheet. However, changes in the thermal history induced by hot stamping may increase this alloy’s stress corrosion cracking (SCC) susceptibility, a common corrosion concern of 7000 series alloys. This work applied the breaking load method for SCC evaluation of hot stamped AA7075-T6 B-pillar panels that had been artificially aged by two different artificial aging practices (one-step and two-step). The breaking load strength of the specimens provided quantitative data that was used to compare the effects of tensile load, duration, alloy, and heat treatment on SCC behavior. It was concluded that, when compared to the traditional one-step aging practice, the parts subjected to a novel two-step aging process were similar with respect to SCC resistance.