ISO INTERNATIONAL STANDARD 28079 First edition 2009-07-15 Hardmetals Palmqvist toughness test Métaux durs Methode d'essai de durete de Palmqvist Reference number ISO 28079:2009(E) @ ISO 2009 ISO 28079:2009(E) Contents Page 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 Indentationandcrackmeasurement 6 Procedure and conditions of testing ... 6.1 Indentations... 6.2 Indentation and crack length measurement 6.3 Test validity .... > Analysis.. 7.1 Vickers hardness 7.2 Toughness... 8 Measurement uncertainty .6 9 Test report Annex A (informative) Report pro forma Palmqvist toughness measurements on hardmetals ... Bibliography ii ISO 28079:2009(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been InternationalElectrotechnicalCommission(iEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 28079 was prepared by Technical Committee ISO/TC 119, Powder metallurgy, Subcommittee SC 4, Sampling and testing methods for hardmetals. ISo 2009 - All rights reserved