Tong, V; Mingard, K P (2026) Recommendations for international standard development for grain size measurement by EBSD of additively manufactured materials. NPL Report. MAT 136

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Abstract

This report extends analysis of an interlaboratory comparison of Electron backscatter diffraction (EBSD) analysis of average grain size and size distribution measurement of an additively manufactured Ni alloy. Based on the results, proposals are made for ways in which a new standard for grain size measurement of additively manufactured materials would differ from the existing ISO13067 grain size standard. In particular, the significant effects of choice of minimum grains size, edge grain inclusion and extrapolation of grain boundaries that are incomplete at the chosen threshold angle have been investigated and recommendations made for their inclusion in the standard. The importance of reporting area weighted averages has been illustrated and should form part of any new standard

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MAT 136
Keywords:	Grain Size, EBSD, Additive Manufacturing
Subjects:	Advanced Materials > Microstructural Characterisation
Divisions:	Materials and Mechanical Metrology
Identification number/DOI:	10.47120/npl.MAT136
Last Modified:	20 Mar 2026 11:23
URI:	https://eprintspublications.npl.co.uk/id/eprint/10336