Roebuck, B; Bennett, E G; Dickson, A; Wicks, M (1999) The measurement of uncertainty in grain size distribution. Interlaboratory exercise part 2 - metallographic images. NPL Report. CMMT(A)230

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Abstract

An investigation of the grain size distribution by the intercept method has been carried out through an interlaboratory exercise,ILE, on representative engineering metallic materials, (two Al alloys and two Ni alloys). The ILE 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 was measured. This report is concerned with the second part of the ILE. The ILE was supported by measurements of intercept distributions obtained from a 3-D model shape, a tetrakaidecahedron. Comparisons were made between the model distribution data in the two Al alloys (AA 1050 and AA 5182) and the two Ni alloys (Waspaloy and IN 909) and the distribution data from the material microstructures. A particular aspect of the study was an evaluation of the uncertainty associated with the measurements.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	CMMT(A)230
Subjects:	Advanced Materials Advanced Materials > Powder Route Materials
Last Modified:	02 Feb 2018 13:18
URI:	http://eprintspublications.npl.co.uk/id/eprint/1264

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