Mechanical Behavior of Normalized Colddrawn AISI 4340 Steel under Biaxial Stress and Rapid Heating

摘要

This report presents a description of test apparatus and experimental procedures for the determination of the biaxial deformation behavior of metallic materials under rapid heating conditions. The results of tests on tubular test specimens of normalized cold-drawn AISI 4340 steel subjected to uniaxial tension and to tension-tension (axial: tangential) biaxial stress ratios of 2:1, 1:1, and 1:2 are given. In general, increasing the heating rate delays specific amounts of plastic deformation to higher temperatures for biaxial stress ratios of 1:0, 1:1, and 1:2, but has little influence on the temperatures at which plastic deformation occurs for the 2:1 biaxial stress ratio. The deformation behavior for the 1:1 and 1:2 stress ratios may be predicted from uniaxial test data for plastic strains up to 2 percent while that for the 2:1 biaxial stress ratio may be predicted only for plastic strains of less than 0.5 percent. (Author)