Abstract
IN the past, several sets of measurements have been made of the variation of Brinell hardness number with grain size, notably on α-brass1, copper and bronze2, and ‘Armco’ iron3. The consistent increase of hardness with grain size was interpreted by these workers2,3 as being dependent on the amount of grain boundary area; that is, a plot of the hardness number against 1/d, where d is the grain diameter, gave a straight line. However, I have found that a plot of hardness number against 1/d 1/2 gave equally ‘good’ straight lines, since the scatter in the original results was rather high, and in one case (α-brass) an even better fit was obtained (Fig. 1).
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References
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HALL, E. Variation of Hardness of Metals with Grain Size. Nature 173, 948–949 (1954). https://doi.org/10.1038/173948b0
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DOI: https://doi.org/10.1038/173948b0
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