Metallic materials; hardness test; Vickers test; part 3: less than HV 0,2

This document specifies the procedures for conducting Vickers hardness tests on metallic materials when the applied force results in loads below HV0.2. It outlines the requirements for the test method, including the preparation of the specimen and the operation of the testing machine. The standard details the necessary conditions for indentation measurement and the calculation of the hardness value based on the diagonal length of the impression. It addresses the specific challenges associated with low-load testing, ensuring accuracy and repeatability in the results. The scope covers the application of diamond pyramid indenters and the use of optical measuring systems to determine the hardness. It provides guidance on the interpretation of data obtained under these specific load conditions, facilitating consistent testing across different laboratories. This method is essential for evaluating thin layers, small components, or microstructural features where traditional higher loads might cause excessive deformation or damage. The procedures described aim to maintain high precision in the measurement of material properties under minimal stress conditions.