Diagonal Measurement
Diagonal measurement: Optical capture of the indentation diagonals after unloading in Vickers hardness testing. The average value calculates the hardness.
Physico-Chemical Mechanism of Action
Diagonal measurement refers to measuring the two diagonal lines of a Vickers indenter after it is unloaded under pressure. These measurements are done optically and serve for precise determination of the hardness degree.
Metallurgical Relevance & Risks in Welding
Incorrect diagonal measurement can lead to inaccurate hardness results, which affects quality assurance. An erroneous measurement can cause misjudgments in material selection and treatment.
Workshop Practice & Instructions
Use an accurate microscope for optical capture of the diagonals. The lines must be precisely aligned with the corners of the Vickers indenter. Measure both diagonals in straight lines and calculate the average. Make sure the microscope is calibrated and measurements are performed under consistent conditions.