Tong, Vivian; Jones, C; Roebuck, B; Walsh, M; Alm, P; Olovsjö, S; M'Saoubi, R; Mingard, K (2026) Quantification of plastic deformation in hardmetal tool inserts at the macroscopic and microstructural level. International Journal of Refractory Metals and Hard Materials, 139. 107770 ISSN 02634368

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Abstract

The need to minimise wear of hardmetal cutting tool materials requires an understanding of, and in turn accurate measurement of, both the external changes in dimensions and the internal microstructural changes which cause plastic deformation underneath the tool coating.

This paper summarises development of methods to quantify the dimensional changes of the complex 3D tip shape of a tool and, from the same tool, quantify the plastic deformation characteristics of the underlying microstructure that determine the external 3D change of shape.

Dimensional changes of the tip shape have been measured using a 3D optical microscope to quantify the small, micrometre scale changes of the worn tip relative to the no-longer-present original surface. The tips have then been sectioned on a well-defined plane relative to the cutting force and the microstructure mapped over large areas at high resolution. Methods to quantify the defects produced by the high temperature creep processes have been evaluated and compared with the external shape change and fundamental creep properties of the hardmetal grades used.

Item Type:	Article
Subjects:	Advanced Materials > Microstructural Characterisation
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.1016/j.ijrmhm.2026.107770
Last Modified:	24 Mar 2026 13:47
URI:	https://eprintspublications.npl.co.uk/id/eprint/10353