Mapping hardness using automated depth sensing process

Measuring the hardness of materials is a way of quickly assessing their mechanical properties. However, using traditional machines for measuring macro- and microhardness of materials and components with graded compositions, complex components, or inhomogenous properties is often time consuming and not cost effective. A new test machine developed by the National Physical Laboratory (NPL) and manufactured under licence by Plint and Partners Ltd offers a fully automated indentation process, which allows large areas to be mapped at high speed. Using the principles of depth sensing to aid automation, the scanning indentation mechanical microprobe (SIMM) has been successfully used to map the hardness of heat treated, coated, and welded components.