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Hello experts! I’m a bit confused about which technology to choose for our foundry. We produce large, heavy cast iron components with relatively rough surfaces. Some colleagues suggest the Leeb rebound method because the parts are massive, but others say the Ultrasonic Contact Impedance (UCI) method is more modern. Given the surface roughness and the grain structure of cast iron, which one would provide a more repeatable result? I don't want to invest in a kit that gives us fluctuating numbers every time we move the probe.
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For large cast iron parts, the Leeb method is usually the traditional choice because it’s less sensitive to surface finish. However, if you need to test specific areas like induction-hardened layers, UCI is superior. The trick with cast iron is that the graphite flakes can mess with UCI readings if the probe isn't calibrated correctly for the material. Modern units often combine both methods in one device, which is the best of both worlds. I suggest browsing the technical specs here: https://teqto.pro/portable-hardness-testers to see the difference in probe types. It really depends on your specific surface preparation.
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