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Microstructural heterogeneity in partially recrystallised ni-base alloys following hot axisymmetric compression.

Mingard, K P; Roebuck, B; Brooks, M; Lord, J D (2008) Microstructural heterogeneity in partially recrystallised ni-base alloys following hot axisymmetric compression. Steel Res. Int., 79 (Specia). pp. 834-841.

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Abstract

Recent research in the UK metal forming community has produced a Good Practice Guide for the measurement of microstructure in hot deformation testpieces, both in axisymmetric and plane strain compression [1]. The Guide was supported by measurements of heterogeneity in structure of four representative engineering alloys; a Ni-base alloy (Waspaloy), a stainless steel (316), an aluminium alloy (AA5052) and a titanium alloy (Ti6Al4V). The current paper expands on specific issues associated with the measurement of recrystallisation in the Ni-base alloy, Waspaloy, especially using a technique that is based on local orientation measurements (EBSD ¿ Electron Back Scatter Diffraction). These observations are augmented with studies of inter-laboratory axisymmetric compression testpieces that were manufactured from Inconel 690. Various schemes for measuring grain size in the presence of twins, internal strains, and different degrees of recrystallisation are discussed with specific recommendations for the quantification of heterogeneity. Comments are also included on new initiatives to standardise EBSD measurements.

Item Type: Article
Keywords: Microstructure Characterisation, Hot Compression Tests, EBSD
Subjects: Advanced Materials
Advanced Materials > Powder Route Materials
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4372

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