EN 24499:1993

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Hardmetals - Metallographic determination of microstructure (ISO 4499:1978)Hartmetalle - Metallographische Bestimmung der Mikrostruktur (ISO 4499:1978)Métaux-durs - Détermination métallographique de la microstructure (ISO 4499:1978)Hardmetals - Metallographic determination of microstructure (ISO 4499:1978)77.160Metalurgija prahovPowder metallurgy77.040.30Kemijska analiza kovinChemical analysis of metalsICS:Ta slovenski standard je istoveten z:EN 24499:1993SIST EN 24499:2000en01-december-2000SIST EN 24499:2000SLOVENSKI
STANDARD
INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEX~YHAPOJJHAR OPTAHM3A~Mfl I-IO CTAH~APTl43A~l4M.ORGANlSATlON INTERNATIONALE DE NORMALISATION Hardmetals - Metallographic determination of microstructure M&aux-durs - Determination mballographique de Ia microstructure First edition - 1978-08-01 UDC 621.762 : 661.665.2 : 620.186 Ref. No. ISO 4499-1978 (E) Descriptors : hardmetals, metallography, microstructure, designations, microscopic analysis, test specimens. Price based on 4 pages SIST EN 24499:2000

FOREWORD ISO (the International Organization for Standardization) is a worldwide federation of national Standards institutes (ISO member bodies). The work of developing International Standards is carried out through ISO technical committees. Evet-y member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 4499 was developed by Technical Committee ISO/TC 1 19, Powder metallurgical materials and products, and was circulated to the member bodies in April 1977. lt has been approved by the member bodies of the following countries : Austral ia I reland Austria I taly Bulgaria Japan Canada Mexico Chile Poland Czechoslovakia Portugal France Romania Germany South Africa, Rep. of Spain Sweden Turkey United Kingdom U.S.A. U.S.S.R. Yugoslavia No member body expressed disapproval of the document. @ International Organkation for Standardkation, 1978 l Printed in Switzerland SIST EN 24499:2000

INTERNATIONAL STANDARD ISO 4499-1978 (E) Hardmetals - Metallographic determination of microstructure 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies methods of metallo- graphic determination of the microstructure of hardmetals. 2 SYMBOLS AND DESIGNATIONS TABLE 1 Symbol a-Phase p-Phase y-Phase r,-twe phases Designation Tungsten carbide Binder Phase (for example based on Co, Ni, Fe) Carbide having a cubic lattice (for example TiC, TaC) which may contain other carbides (for example WC) in solid Solution Multiple carbides of tungsten and at least one metal of the binder Phase 3 APPARATUS 3.1 Metallographic microscope, permitting observations at magnifications up to 1 500 X. 3.2 Equipment for preparation of test-piece sections 4 PREPARATION OF TEST-PIECE SECTION The test-piece section shall be prepared as for metallo- graphic examination and the surface to be examined shall be free from grinding and polishing marks. Care shall be taken to avoid tearing out of particles, which may lead to a wrong evaluation of microstructure. NOTE - There are several methods for preparation of hardmetal surfaces for metallographic examination. Firstly, careful coarse grinding is c
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