Abstract
A program was conducted to determine how fatigue properties are affected in improperly quenched, substrength aluminum. Such a condition can result from an improper quench from the solutionizing temperature during heat-treating, leaving regions in the final product with substantially lower mechanical properties than those of properly heat-treated material. Properties thoroughly examined are both constant amplitude and spectrum loading fatigue, and fatigue crack growth, likewise under constant amplitude and spectrum loading conditions. Results obtained for two substrength aluminum alloys were similar: the improperly quenched material is inferior to properly quenched material under fatigue loading. For aluminum 2124, the fatigue crack propagation rate of the substrength material is over 40% faster than for the normal material, and only at stress intensities, approaching K c do the differences diminish. Also the effect of a defective quench appears to be influenced by alloy type, with aluminum 2124 affected to a much greater extent than 7075.
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