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Discussion Forums - The Hendrix Group
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10/26/2002 9:00 AM
 
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A document I recently obtained says "It is a common practice in malleable iron to use nodule count per unit area instead of a comparison chart as given here. Nodule count, with known free carbon content, is a measure of calculated average nodule area." (the chart mentioned above is for FC casting) The part I don't understand is "calculated average nodule area." More specifically, I don't understand what part in a metal sample is nodule area in this material. I guess the sentence above imply that if I count the number of nodules in a unit area and if I know the percentage of free carbon content, I can obtain a value which is close to the value obtained by calculation. I am right?
 
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10/26/2002 9:00 AM
 
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Dear Sir: Nodules in mallable iron are basically free carbon. The nodule count per unit area is a valid method of establishing the nodule percentage area, as opposed to a comparison chart. ASTM E-562 provides several techniques for quantifying the percentage of a constituent in a matrix. However, the comparison chart is easier and quicker if the increased accuracy of counting nodules is not needed. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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10/29/2002 9:00 AM
 
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Dear Mr. Hendrix Thank you very much for your input. Chihiro
 
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