Optical micrographs of cast iron with graphites labels according to ISO 945

This dataset comprise 19 micrographs acquired on different cast iron samples showing varying amounts of the different classes of graphite particles. They were all acquired at x100 magnification and all but one were digitalized with a resolution of 1280 x 1024 pixels, giving a pixel size of 0.8 µm. The last micrograph was acquired with a pixel size half that of the others. They have been automatically labelled by Image Analysis followed by manual corrections. The amount of corrections was around 37%. The labels are given by one color per graphite class (ISO 945): Orange for class I, Red for class III, Blue for class V and Green for class VI.