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

Journal Article
2017-01-1271
ISSN: 1946-3936, e-ISSN: 1946-3944
DOI: https://doi.org/10.4271/2017-01-1271
Published March 28, 2017 by SAE International in United States
Stress-Corrosion Cracking Evaluation of Hot-Stamped AA7075-T6 B-Pillars
Sector:
Citation: Wright, D., Henshaw, J., Harrison, N., and Luckey, S., "Stress-Corrosion Cracking Evaluation of Hot-Stamped AA7075-T6 B-Pillars," SAE Int. J. Engines 10(4):2021-2026, 2017, https://doi.org/10.4271/2017-01-1271.
Language: English

Abstract:

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.

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