BS ISO 28079:2009

Foreword
Introduction
1 Scope
2 Normative references
3 Symbols and units
4 Test pieces and sample preparation
  4.1 Test piece size and sampling
  4.2 Surface preparation
  4.3 Surface condition
5 Apparatus
  5.1 General
  5.2 Indentation
  5.3 Indentation and crack measurement
6 Procedure and conditions of testing
  6.1 Indentations
  6.2 Indentation and crack length measurement
  6.3 Test validity
7 Analysis
  7.1 Vickers hardness
  7.2 Toughness
8 Measurement uncertainty
9 Test report
Annex A (informative) - Report pro forma - Palmqvist
                        toughness measurements on
                        hardmetals
Bibliography

Describes a method for measuring the Palmqvist toughness of hardmetals and cermets at room temperature by an indentation method.

This International Standard specifies a method for measuring the Palmqvist toughness of hardmetals and cermets at room temperature by an indentation method. This International Standard applies to a measurement of toughness, called Palmqvist toughness, calculated from the total length of cracks emanating from the corners of a Vickers hardness indentation, and it is intended for use with metal-bonded carbides and carbonitrides (normally called hardmetals, cermets or cemented carbides). The test procedures proposed in this International Standard are intended for use at ambient temperatures, but can be extended to higher or lower temperatures by agreement. The test procedures proposed in this International Standard are also intended for use in a normal laboratory-air environment. They are not intended for use in corrosive environments, such as strong acids or seawater.