Abstract
This paper describes a new test which measures a material’s propensity for localized flow via an empirical parameter, percent Distributed Gage Volume (pct DGV). The specimens, which are deformed uniaxially in compression, are cylindrical and feature a reduced gage section. The measurement and calculation of pct DGV are presented in detail. Low values of pct DGV are associated with localized plastic flow and the formation of shear bands and gradients in hardness, microstructure, and flow in the test specimens. The test, therefore, offers a means to evaluate material and operating conditions that will minimize nonuniformity in production forgings of complex shapes. Test results on austenitic steels, a precipitation hardening stain less steel, 6061 aluminum, and Ti-6Al-4V show that deformation behavior depends on the alloy as well as on the microstructural condition of the alloy. The localized flow and shear band formation are related to dynamic recovery, dynamic recrystalli zation, and precipitation.
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