Roebuck, B; Bennett, E G; Dickson, A (1999) The measurement of uncertainty in grain size distribution. Interlaboratory exercise. Part 1 - Reference Images. NPL Report. CMMT(A)154

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Abstract

An investigation of the grain size distribution by the intercept method, in three engineering metallic materials, an Al alloy (AA5182) and two Ni alloys (Waspaloy and IN909) has been carried out through an interlaboratory exercise, ll...E. The ll...E was performed in two parts. In the first part reference images generated at NPL from optical micrographs were measured. In the second part, a set of optical micrographs were measured. This report concerns the first part of the ILE, the measurements on the reference images.
The ILE was supported by measurements of intercept distributions obtained from a 3-D model shape, a tetrakaidecahedron. A PC computer program was written to rotate and randomly section the model generating data on section area, intercept lengths, and area sides and vertices. Comparisons were made between the model distribution data and the distribution data from the material microstructures.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	CMMT(A)154
Subjects:	Advanced Materials Advanced Materials > Powder Route Materials
Last Modified:	10 Sep 2018 13:58
URI:	http://eprintspublications.npl.co.uk/id/eprint/1062

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