1、October 2009DEUTSCHE NORM English price group 7No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 77.040.10; 77.160!$Z4S“
2、1551748www.din.deDDIN EN ISO 3327Hardmetals Determination of transverse rupture strength (ISO 3327:2009)English version of DIN EN ISO 3327:2009-10Hartmetalle Bestimmung der Biegebruchfestigkeit (ISO 3327:2009)Englische Fassung DIN EN ISO 3327:2009-10SupersedesDIN ISO 3327:1991-07www.beuth.deDocument
3、 comprises 10 pagesDIN EN ISO 3327:2009-10 2 National foreword This standard has been prepared by Technical Committee ISO/TC 119 “Powder metallurgy” (Secretariat: SIS, Sweden) in collaboration with Technical Committee CEN/SS M11 “Powder metallurgy” (Secretariat: CMC). The responsible German body inv
4、olved in its preparation was the Normenausschuss Werkstofftechnologie (Technology of Materials Standards Committee), Technical Committee NA 145-01-04 AA Probenahme und Prfverfahren fr Hartmetalle. Amendments This standard differs from DIN ISO 3327:1991-07 as follows: a) The standard has been brought
5、 in line with ISO 3327:2009, which has been technically revised. b) Test piece Type C has been added. Previous editions DIN ISO 3327: 1991-07 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3327 May 2009 ICS 77.160; 77.040.10 Supersedes EN 23327:1993 English Version Hardmetals - Determinati
6、on of transverse rupture strength (ISO 3327:2009) Mtaux-durs - Dtermination de la rsistance la flexion (ISO 3327:2009) Hartmetalle - Bestimmung der Biegebruchfestigkeit (ISO 3327:2009) This European Standard was approved by CEN on 16 April 2009. CEN members are bound to comply with the CEN/CENELEC I
7、nternal 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 obtained on application to the CEN Management Centre or to any CEN
8、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 CEN Management Centre has the same status as the official versions. CEN m
9、embers are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Swede
10、n, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. R
11、ef. No. EN ISO 3327:2009: EContents Page Foreword3 1 Scope 4 2 Symbols and designations .4 3 Principle4 4 Apparatus .4 5 Test pieces .5 6 Procedure .6 7 Expression of results 6 8 Test report 7 Bibliography8 2 DIN EN ISO 3327:2009-10 EN ISO 3327:2009 (E) Foreword This document (EN ISO 3327:2009) has
12、been prepared by Technical Committee ISO/TC 119 “Powder metallurgy” in collaboration withTechnical Committee CEN/SS M11 “Powder metallurgy” the secretariat of which is held by CMC. This European Standard shall be given the status of a national standard, either by publication of an identical text or
13、by endorsement, at the latest by November 2009, and conflicting national standards shall be withdrawn at the latest by November 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible
14、 for identifying any or all such patent rights. This document supersedes EN 23327:1993. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic
15、, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 3327:2009 has been a
16、pproved by CEN as a EN ISO 3327:2009 without any modification. 3 EN ISO 3327:2009 (E) DIN EN ISO 3327:2009-10 1 Scope This International Standard specifies a method for the determination of the transverse rupture strength of hardmetals. This method is applicable to hardmetals of negligible ductility
17、. If it is used for hardmetals showing significant plastic deformation before breaking, incorrect results may be obtained. In such cases, the method may be used for comparison purposes only. 2 Symbols and designations For the purposes of this document, the symbols, designations and units given in Ta
18、ble 1 apply. Table 1 Symbols and designations Symbol Designation Unit F Force required to fracture the test piece N l Distance between supports mm b Width of test piece perpendicular to its height mm h Height of test piece parallel to the direction of application of the test force mm k Correction fa
19、ctor to compensate for the chamfer RaSurface roughness m RbmTransverse rupture strength N/mm2d Diameter of test piece (if a cylindrical test piece is used) mm 3 Principle Breaking a test piece lying freely on two supports by application of a force at the midpoint of the span, under conditions of sho
20、rt-term static application of the force. 4 Apparatus 4.1 Device for applying a force, capable of applying a uniformly increasing force with an accuracy of 1 % or better. 4.2 Three cylinders (rollers), of which two are freely lying support cylinders with a fixed distance between them and one is a fre
21、ely lying force cylinder. The three cylinders shall be of equal diameter between 3,2 mm and 6 mm. 4 DIN EN ISO 3327:2009-10 EN ISO 3327:2009 (E) Alternatively, the force may be applied by a ball having a diameter of 10 mm. Loading of the test piece can only be made via three cylinders if a cylindric
22、al test piece is used. Consequently, a ball is only applicable for test pieces having plane surfaces. The support cylinders and the force cylinder or ball shall be made of tungsten carbide hardmetal which will not be visibly deformed by the applied force. The surface roughness Raof the cylinders and
23、 the ball shall not be greater than 0,63 m. The support cylinders shall be mounted parallel, with a span between them of 30 mm 0,5 mm for Type A test pieces and 14,5 mm 0,5 mm for Type B or Type C test pieces. The measurement of the span used for the calculation shall be made to an accuracy of 0,1 m
24、m for Type B or Type C test pieces and to an accuracy of 0,2 mm for Type A test pieces. The mounting of the cylinders shall be such as to minimize deviations from parallelism of the support cylinders. 4.3 A suitable protective guard, surrounding the fixture for safety. 5 Test pieces 5.1 The test pie
25、ces shall be of rectangular (Type A or B) or cylindrical (Type C) cross-section and shall have the dimensions shown in Table 2. Table 2 Dimensions of test pieces Dimensions in millimetres Type Length Width/Diameter Height A 35 1 5 0,25 5 0,25 B 20 1 6,5 0,25 5,25 0,25 C 25 5 3,3 0,5 NOTE In general,
26、 Type B test pieces give strength values which are about 10 % to 20 % higher than those obtained using Type A test pieces, depending on the material tested and provided that they have the same surface conditions. The repeatability is similar for all types of test piece. Type C test pieces give stren
27、gth values which are about 5 % 10 % higher than Type B specimens whereas the increase of the strength values are material related. 5.2 The test pieces shall be ground on the four faces which are parallel to the length with a free-cutting diamond wheel, preferably resin bonded, using copious quantiti
28、es of coolant. No pass shall exceed 0,01 mm and all grinding marks shall be parallel to the length. The amount taken off each face shall be not less than 0,1 mm and the surface roughness shall be Rau 0,4 m. The four long edges shall be chamfered to 0,15 mm to 0,2 mm at an angle of 45 and all grindin
29、g marks shall be parallel to the length. Type C test pieces shall be centreless ground to a surface roughness Rau 0,4 m. 5.3 It is also permitted to use test pieces in the as-sintered condition. Such test pieces shall have a chamfer of 0,4 mm to 0,5 mm at an angle of 45, made before sintering to avo
30、id flash. Bend strength results from as-sintered test pieces are generally significantly lower than those for ground test pieces. Surface preparation is an important variable and should be standardized to ensure that consistent results are obtained. 5.4 The deviation from parallelism of opposite lon
31、gitudinal sides, in both the longitudinal and transverse directions, shall not exceed 0,05 mm for each 10 mm length for as-sintered test pieces and 0,01 mm for each 10 mm length for ground test pieces. For round test pieces, opposite sides shall be parallel within 0,015 mm. 5 EN ISO 3327:2009 (E) DI
32、N EN ISO 3327:2009-10 5.5 Width and height measurements used for calculation of the results shall be carried out at the middle of the test pieces to the nearest 0,01 mm. 5.6 The test pieces shall be free from visual surface cracks and structural defects. 6 Procedure 6.1 Place a test piece flat and c
33、entrally on the support cylinders so that its length is perpendicular to the lengths of the support cylinders. In the case of a Type B test piece, place its width on the support cylinders. 6.2 Bring the force cylinder or ball gradually into contact with the test piece. The deviation of the line or t
34、he point of application of the force from the middle of the span shall not exceed 0,5 mm for Type A test pieces and 0,2 mm for Type B test pieces. 6.3 Increase the stress in the test piece at a uniform rate not exceeding 200 N/(mm2s). NOTE This corresponds to a force increasing at a maximum rate of
35、1 600 N/s for Type B and Type C test pieces and 600 N/s for Type A test pieces. 7 Expression of results 7.1 The transverse rupture strength Rbm, expressed in newtons per square millimetre, is given by the equation: bm232kFlRbh=for rectangular test pieces. Values of the chamfer correction factor, k,
36、are given in Table 3. Table 3 Values of chamfer correction factor, k Test piece type Chamfer mm Correction factor k A 0,4 to 0,5 1,03 A 0,15 to 0,2 1,00 B 0,4 to 0,5 1,02 B 0,15 to 0,2 1,00 The transverse rupture strength Rbm, expressed in newtons per square millimetre, is given by the equation: bm3
37、8 F lRd=for cylindrical test pieces. NOTE The equation for calculating the transverse rupture strength does not take into account the effect of any plastic deformation that might occur. 6 DIN EN ISO 3327:2009-10 EN ISO 3327:2009 (E) 7.2 Report the arithmetical mean of at least five transverse ruptur
38、e strength determinations, round to the nearest 10 N/mm2. 8 Test report Since the test piece geometry and surface preparation can significantly affect the values of transverse rupture strength, it is important that the test report shall include the following information: a) a reference to this Inter
39、national Standard; b) all details necessary for identification of the test sample; c) the type of test piece and the method of preparation of its surface; d) the method of applying the force; e) the result obtained. The following additional subscripts shall be added to the symbol indicating transver
40、se rupture strength, to indicate the surface condition, i.e. sintered (S) or ground (G): for Type A test pieces: A30S or A30G, for Type B test pieces: B15S or B15G, for Type C test pieces: C15S or C15G EXAMPLES Rbm30(A30S), Rbm30(A30G); f) all operations not specified in this International Standard,
41、 or regarded as optional; g) details of any occurrence which may have affected the result. 7 EN ISO 3327:2009 (E) DIN EN ISO 3327:2009-10 Bibliography 1 ROEBUCK, B. VAMAS Report No. 22, June 1996 (ISSN 1016-2186), B. Bend Strength Measurements for Hardmetals, Part 1 Rationale and Results 2 ROEBUCK, B. Effect of Test Piece Geometry on the Bend Strength of Hardmetals, 14th Int. Plansee Seminar 97, Reutte, Austria, V2, pp. 352-365 3 VAMAS Report, Part 2, Analysis, No. 24, 1997 (ISSN 1016-2186) 8 DIN EN ISO 3327:2009-10 EN ISO 3327:2009 (E)
