EN 24505:1993

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Hardmetals - Metallographic determination of porosity and uncombined carbon (ISO 4505:1978)Hartmetalle - Metallographische Bestimmung der Porosität und des ungebundenen Kohlenstoffs (ISO 4505:1978)Métaux-durs - Détermination métallographique de la porosité et du carbone non combiné (ISO 4505:1978)Hardmetals - Metallographic determination of porosity and uncombined carbon (ISO 4505:1978)77.160Metalurgija prahovPowder metallurgy77.040.30Kemijska analiza kovinChemical analysis of metalsICS:Ta slovenski standard je istoveten z:EN 24505:1993SIST EN 24505:2000en01-december-2000SIST EN 24505:2000SLOVENSKI
STANDARD
INTERNATIONAL STANDARD 4505 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*MEWYHAPOflHAR OPrAHM3A~MR I-IO CTAH~APTM3A~MWORGANISATlON INTERNATIONALE DE NORMALISATION Hardmetals - Metallographic determination of porosity and uncombined carbon IWtauxdurs - Determination mhallographique de la porosit6 et du carbone non combine First edition - 1978-08-01 UDC 621.762 : 661.665.2 : 620.186 Descriptors : hardmetals, metallography, microscopic analysis, porosity, carbon. Ref. No. ISO 4505-1978 (E) Price based on 5 pages SIST EN 24505:2000

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 4505 was developed by Technical Committee lSO/TC 119, 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 Ireland Austria Italy 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 24505:2000

INTERNATIONAL STANDARD ISO 45054978 (E) Hardmetals - Metallographic determination of porosity and uncombined carbon 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies methods for the metallographic determination of the presence, type, and distribution of porosity and uncombined carbon in hardmetals. 2 APPARATUS 2.1 Metallographic microscope, or other suitable equip- ment permitting observations and measurements on a Screen up to the required magnification (see clause 4). 2.2 Equipment for preparation of test-piece sections. 3 PREPARATION OF TEST-PIECE SECTIONS 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 porosity. NOTE - There are several methods for the preparation of hardmetal surfaces for metallographic examination. Firstly, careful coarse grinding is carried out to remove sufficient material to ensure that the true structure is revealed. After grinding with fine diamond grit wheels, polishing is effected by using diamond Paste or diamond powders of progressively finer grain size down to 1 Pm on rigidly suppo
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