1、BS EN ISO3327:2009ICS 77.040.10; 77.160NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDHardmetals Determination oftransverse rupturestrength (ISO3327:2009)This British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 Ju
2、ly 2009 BSI 2009ISBN 978 0 580 56453 6Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 3327:2009National forewordThis British Standard is the UK implementation of EN ISO 3327:2009. Itsupersedes BS EN 23327:1993 which is withdrawn.The UK participation in its preparation was entrus
3、ted to TechnicalCommittee ISE/65, Sintered metal components.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compl
4、iance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 3327May 2009ICS 77.160; 77.040.10 Supersedes EN 23327:1993 English VersionHardmetals - Determination of transverse rupture strength (ISO3327:2009)Mtaux-durs - Dtermination
5、 de la rsistance la flexion(ISO 3327:2009)Hartmetalle - Bestimmung der Biegebruchfestigkeit (ISO3327:2009)This European Standard was approved by CEN on 16 April 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStand
6、ard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French,
7、German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech
8、Republic, 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 United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE
9、 NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 3327:2009: EBS EN ISO 3327:2009EN ISO 3327:2009 (E) 3 Foreword This document (E
10、N ISO 3327:2009) has 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
11、an identical text or 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 no
12、t be held responsible 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, C
13、yprus, Czech Republic, 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
14、 3327:2009 has been approved by CEN as a EN ISO 3327:2009 without any modification. BS EN ISO 3327:2009ISO 3327:2009(E) ISO 2009 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wo
15、rk of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governm
16、ental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The
17、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.
18、Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3327 was prepared by Technical Committee ISO/TC 119, Powder metallurgy, Subcommittee SC 4, Sampli
19、ng and testing methods for hardmetals. This third edition cancels and replaces the second edition (ISO 3327:1982), which has been technically revised. BS EN ISO 3327:2009BS EN ISO 3327:2009INTERNATIONAL STANDARD ISO 3327:2009(E) ISO 2009 All rights reserved 1Hardmetals Determination of transverse ru
20、pture strength 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. If it is used for hardmetals showing significant plastic deformation before breaking, incorre
21、ct 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 Table 1 apply. Table 1 Symbols and designations Symbol Designation Unit F Force required to fract
22、ure 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 factor to compensate for the chamfer RaSurface roughness m RbmTransverse rupture strength N/mm2d
23、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 short-term static application of the force. 4 Apparatus 4.1 Device for applying a force, capable o
24、f 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 freely lying force cylinder. The three cylinders shall be of equal diameter between 3,2 mm and 6 m
25、m. BS EN ISO 3327:2009ISO 3327:2009(E) 2 ISO 2009 All rights reservedAlternatively, 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 cylindrical test piece is used. Consequently, a ball is only applicable for test piec
26、es 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 the ball shall not be greater than 0,63 m. The support cylinders shall be m
27、ounted 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 mm for Type B or Type C test pieces and to an accuracy of 0,2 mm for Type A t
28、est 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 pieces shall be of rectangular (Type A or B) or cylindrical (Type C) cross-sect
29、ion 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, Type B test pieces give strength values which are about 10 % to 20 % higher
30、 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 strength values which are about 5 % 10 % higher than Type B specimens whereas the
31、 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 quantities of coolant. No pass shall exceed 0,01 mm and all grinding marks shall be
32、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 grinding marks shall be parallel to the length. Type C test pieces shall be centrel
33、ess 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 avoid flash. Bend strength results from as-sintered test pieces are generally s
34、ignificantly 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 longitudinal sides, in both the longitudinal and transverse directions, shall n
35、ot 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. BS EN ISO 3327:2009ISO 3327:2009(E) ISO 2009 All rights reserved 35.5 Width and height measurements u
36、sed 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 centrally on the support cylinders so that its length is p
37、erpendicular 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 the point of application of the force from the middle of t
38、he 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 1 600 N/s for Type B and Type C test pieces and 600 N/s f
39、or 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, are given in Table 3. Table 3 Values of chamfer correctio
40、n 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: bm38 F lRd=for cylindrical test pieces. NOTE The equation fo
41、r calculating the transverse rupture strength does not take into account the effect of any plastic deformation that might occur. BS EN ISO 3327:2009ISO 3327:2009(E) 4 ISO 2009 All rights reserved7.2 Report the arithmetical mean of at least five transverse rupture strength determinations, round to th
42、e 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 International Standard; b) all details nece
43、ssary 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 transverse rupture strength, to indicate the s
44、urface 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, or regarded as optional; g) details o
45、f any occurrence which may have affected the result. BS EN ISO 3327:2009ISO 3327:2009(E) ISO 2009 All rights reserved 5Bibliography 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 P
46、iece 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) BS EN ISO3327:2009BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996
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