Indentation parameters for Brinell hardness measurement of low carbon steels

Abstract

Brinell hardness of steel 20 was measured with a ball of constant diameter according to the standard technique D=10 mm at different test load values from the range F=62.5...3000 kgf. The diameter d of the reconstructed indentation was measured. According to the developed method the deformation resistance of the sample material in the plastic zone bounded by a hemisphere was determined. The highest values of deformation resistance were recorded at indentation up to the ratio of d/D=0.245. Based on the results obtained, it is recommended to measure the Brinell hardness of steel 20 at the degree of loading F/D2=5. During the ball indentation process, the sample material undergoes significant deformation, which must be taken into account when measuring hardness. © 2024 The Authors, published by EDP Sciences.