How can the thickness of the TRD layer be measured?
b) Scope – Using b ray backward – Scattering Strength c) X-ray fluorescence analysis d) Microscopic method over the coated section – Microscope and polishing devise( required not to have round edges at the edge of coating during polishing, otherwise an accurate number will not be measured) 21. How hard is the TRD Carbide layer and how can it be measured? Vanadium carbide layer is measured at approximately Hv 3,200-3,800; Chrome carbide (Cr23, C6, Cr7C3C) measures approximately Hv 2,500. It is considered to be an appropriate value since those values are almost equivalent to the hardness of the carbide grains contained in the tool steel material. It is always very difficult to measure such a thin layer with such an extremely high hardness. Sometimes you read an article or data showing Vanadium Carbide has a hardness of Hv 1,500-2,000, which is the measuring result without the consideration of the loading effect. If the load is too high, measuring devices read the hardness of the softer s
