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One of the main topics the working group “Quantitative Structural Analysis“ deals with is cast iron. The examination of metallographic 2D sections in order to eventually thus deduce the material properties of the three dimensional microstructure is common practice. Based on the results of a round robin test already performed in 2014, one of the then used samples was three-dimensionally measured in the IABG [1]. Using the thus obtained image data, a comparison between the 2D and 3D measurement results was performed in the second round robin test presented here. For the parameters graphite fraction and graphite size, a very good agreement could be achieved. However, there were important variations for the shape classification and the determination of the particle density. The main cause for this is the lack of appropriate specifications in the standard. Thus, the working group should further intensify the existing contact with the respective standardization bodies.

practical metallography

Round Robin Test on the “Analysis of Graphite Shapes by Means of Microscopic Images of Cast Iron Samples” in the DGM Working Group “Quantitative Structural Analysis” of the Expert Committee Materialography