Hi,
We've report nodules count by comparison with ASTM A247 charts since many years. Typical values with ASTM A536 Ductile Iron was from 100 to
200 /mm2.Now we are looking to use an image analysis software that generates many data. One of those is nodules count. We had a big surprise that for our same samples, the software is reporting from 400 to 500 /mm2 and we are interpreting with the charts only 100 to 200 /mm2.
My first try was to eliminate more small particles with the soft. The results was now less then 400 /mm2 but very far from what we are expecting. What I think I understand is that those ASTM charts use samples that have almost one size of nodules. In real life, there are no samples that can show this type of results. We always have a mixed population of nodules sizes and shapes. When we try to choose the right nodules count with the chart we must filter a lot what we see. Software doesn't do that. It computes what it sees and it's better like that.
Am I the only one who has problems with this?