Roebuck, B; Phatak, C; Birks-Agnew, I (2004) A comparison of the linear intercept and equivalent circle methods for grain size measurement in WC/Co hardmetals. NPL Report. MATC(A)149

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Abstract

A computer model (POLYCHOP; developed at NPL) was used to calculate the equivalent circle diameter (ECD) and linear intercept (LI) grain size for a range of different crystal shapes, including a cube, a tetrakaidekahedron and a truncated trigonal prism. The effects of differences in size distribution and shape factors were studied and the results were compared with experimental measurements of the ECD and LI on sintered WC/Co hardmetals. Both the model and experimental results showed a linear correlation between ECD and LI for materials with grain sizes ranging from 0.5 to 5 µm. However, the model calculations, although showing the same trend, did not agree with the measurements. Possible reasons for this discrepancy, such as the difficulty of measurement of small grains, are discussed.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MATC(A)149
Subjects:	Advanced Materials Advanced Materials > Powder Route Materials
Last Modified:	02 Feb 2018 13:16
URI:	http://eprintspublications.npl.co.uk/id/eprint/2947

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