Effect of Specimen Thickness and Punch Diameter in Evaluation of Small Punch Test Parameters Toward Characterization of Mechanical Properties of Cr-Mo Steels

摘要

Small punch tests on circular specimens were conducted using hemispherical tipped punches on Chromium-Molybdenum (Cr-Mo) steels of varying thermal histories. Combinations of punch diameters and sample thicknesses were used to obtain load-load line displacement (LLD) responses of these steels. Characteristic load, displacement, and energy values at transition points on LLD curves were identified and their dependency on punch diameter and sample thicknesses were studied. From the studies, sample thicknesses in the range of 0.4 to 0.5 mm and a punch tip diameter of more than 1.7 mm have been suggested to be used for the application of the SPT test procedure in the assessment of mechanical properties of in-service Cr-Mo steel components.