Reference Blocks for Penetrant Testing

Reference specimens for penetrant testing have been developed that allow optical microscope assisted measurements of both the opening width of surface defects and their depth with the simultaneous condition that defect cavities do not extend onto the side faces of the blocks. Experimental data on the dependence of the defect indication areas after their development on their width (0.5–8.5 μm) and depth (40–860 mm) are presented. Using correlation analysis, the statistical significance of the above parameters is demonstrated.