1、CEN ENS24884 93 3404589 0047LVO b7T = EUROPEAN STANDARD EN 24884 NORME EUROPENNE EUROPISCHE NORM April 1993 UDC 669.018.25-492.2 : 620.11 Descriptors: Powder metallurgy, hard metals, sampling, specimen, preparation, sintered products, tests English version Hardmetals - Sampling and testing of powder
2、s using sintered test pieces (IS0 4884 : 1978) Mtaux-durs - Echantillonnage et essais des poudres au moyen dprouvettes frittes (IS0 4884 : 1978) Probekrpern Hartmetalle - Probenahme und Prfung von Pulvern unter Verwendung von gesinterten (IS0 4884 : 1978) This European Standard was approved by CEN o
3、n 1993-04-02. CEN members are bound to comply with the CENNENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be
4、obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central
5、Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Comm
6、ittee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B- 1050 Brussels O 1993 Copyright reserved to CEN members Ref. No. EN 24884 : 1993 E Page 2 EN 24884 : 1993 Foreword In 1992, IS0 4884 : 1978 Hardmetals - Sampling and tes
7、ting of powders using sintered test pieces was submitted to the CEN Primary Questionnnah-e procedure. Following the positive result of the CEN/CS Proposal IS0 4884 : 1978 was submitted to the CEN Formal Vote. The result of the Formal Vote was positive. This European Standard shall be given the statu
8、s of a national standard, either by publication of an identical text or by endorsement, at the latest by October 1993, and conflicting national standards shail be withdrawn at the latest by October 1993. According to Internal Regulations of CENKENELEC, the following countries are bound to implement
9、this European Standard: Austria, Belgium, Denmark, Finland, Rance, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN ENx24884 93 W 3404589 00471i42 442 W 1 SCOPE AND FIELD OF APPLICATION This International Standard
10、 relates to the sampling and testing of powder mixtures for the manufacture of hard- metals, using sintered test pieces, and to the preparation of test pieces. 2 REFERENCES IS0 3326, Hardmetals - Determination of (the magnet- ization) coercivity. IS0 3327, Hardmetals - Determination of transverse ru
11、pture strength. IS0 3369, Impermeable sintered metal materials and hard- metals - Determination of density. IS0 3738, Hardmetals - Rockwell hardness test (scale A). IS0 3878, Hardmetals - Vickers hardness test. IS0 3954, Powder for powder metallurgical purposes - Sampling. IS0 4499, Hardmetals - Met
12、allographic determination of microstrvcture. I SO 4505, Hardmetals - Metallographic determination of porosity and uncombined carbon. 3 DEFINITIONS For terms and definitions, see IS0 3954. 4 SAMPLING 4.1 Sampling from a lot shall be carried out in conformity with IS0 3954. 4.2 In the event that a bat
13、ch is blended into one lot in one blender as the last operation before separation into containers, then by agreement between producer and consumer one or more test samples may be taken from the blender. 5 PREPARATION OF TEST PIECES 5.1 The test pieces shall be processed from the test sample in confo
14、rmity with their grade and dimensions. All the test Page 3 EN 24884 : 1993 pieces for each type of testing shall be sintered simul- taneously under the same conditions and in the same furnace. 5.2 To ensure that the properties of the test pieces prepared from the lot of powder are significant, the a
15、ppropriate manufacturing conditions shall be used in the production of the test pieces. 5.3 The dimensions of the test pieces shall comply with the requirements of the relevant International Standards. For the determination of porosity, one or more test pieces shall be sectioned to enable a total ar
16、ea of not less than 1 cm2 to be examined. 6 TESTING Tests usually carried out on sintered test pieces from a lot of powder are given in the following table. Type of testing Determination of coercivity Determination of transverse rupture strength Determination of density Determination of hardness HRA
17、 Determination of hardness HV Determination of microstructure Determination of porosity and uncombined carbon International !&andard IS0 3326 IS0 3327 IS0 3369 IS0 3738 IS0 3878 IS0 4499 IS0 4505 NOTES 1 The determination of the propenies listed in the table may be carried out on the same test piece
18、s but the determination of hard- ness, microstructure and porosity shall not be carried out before the determination of transverse rupture strength. 2 Because of the high scatter given by the transveme rupture test, its value is limited when testing an individual lot of powder. 3 Chemical analysis m
19、ay be carried out on a test sample taken from the powder lot or on a sintered test piece. Annex ZA (normative) Normative references to international publications with their relevant European publications This European Standard incorporates by dated or undated reference, provisions from other publica
20、tions. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision,
21、 For undated references the latest edition of the publication referred to applies (including amendments). Publication Year Title IS0 3326 1975 Hardmetals - Determination of (the magnetiza- EN 23326 tion) coercivity IS0 3327 1982 Hardmetals - Determination of transverse EN 23327 rupture strength ISO
22、3369 1975 Impermeable sintered metal materials and EN 23369 hardmetals - Determination of density IS0 3738 1986/88 Hardmetals - Rockwell hardness test (scale A) - IS0 3878 1983 Hardmetals - Vickers hardness test EN 23878 IS0 3954 1977 Powders for powder metallurgical purposes - EN 23954 Sampling IS0 4499 1978 Hardmetals - Metallographic determination of EN 24499 microstructure IS0 4505 1978 Hardmetals - Metallographic determination of EN 24505 porosity and uncombined carbone m 1993 1993 1993 - 1993 1993 1993 1993
