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The percent reduction of area for tension specimens made in the through-thickness direction of plates (%RAZ) is often determined to give a relative measure of the resistance to lamellar tearing. Testing variables can affect the %RAZ measured. Results are presented of investigations designed to examine some effects of (1) tension specimen design, (2) specimen location relative to the original ingot, (3) steel microstructure, (4) material strength level, (5) specimen-to-specimen variability, and (6) final diameter measurement reproducibility. Tension specimens in the Z-direction with an 8.9 mm (0.350 in.) diameter and 50.8 to 63.5 mm (2 to 2
Results indicate that specifications covering the through-thickness tension testing of roiled steel plates should reference the test location to the original as-cast ingot or slab if the region of lowest %RAZ is to be reported. Specifications need to address the problem of specimen-to-specimen variability and %RAZ reproducibility when determining the number of specimens to be tested and establishing acceptance criteria.
through-thickness tension test, reduction of area, lamellar tearing, plates, tension testing variables, material variables
Senior Research Metallurgist, Research and Technology, Armco Inc., Middletown, Ohio
Supervising Metallurgist, Southwestern Steel Division, Armco Inc., Houston, Tex.