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Particle distribution in steels has been widely reported in the scientific literature in terms of quantity and size of these particles. However, in these studies there is barely any information about the homogeneity or heterogeneity of the particle distribution. A cryogenically treated AISI A8 tool steel was compared against a conventionally treated one, not only in terms of the number and size of precipitated carbides, but also their distribution. Scanning-electron-microscopy images were automatically analyzed for this quantification. The results revealed an increase of 100 % in the number of carbides and a reduction of 35 % in the mean size of the precipitates for the cryogenically treated sample. The distribution of the particles – which turned out to be more homogeneous for the cryogenically treated sample – was characterized using the methodology described here, which applies automatic image analysis. These results may lead to an improvement in the wear resistance of a cryogenically treated AISI A8 alloy.

Carbide distribution based on automatic image analysis for cryogenically treated tool steels