1、March 2017 English price group 10No part of this translation 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!%bo-“2637610www.
2、din.deDIN EN ISO 3928Sintered metal materials, excluding hardmetals Fatigue test pieces (ISO 3928:2016);English version EN ISO 3928:2016,English translation of DIN EN ISO 3928:2017-03Sintermetallwerkstoffe, ausgenommen Hartmetalle Probekrper fr die Ermdungsprfung (ISO 3928:2016);Englische Fassung EN
3、 ISO 3928:2016,Englische bersetzung von DIN EN ISO 3928:2017-03Matriaux mtalliques fritts, lexclusion des mtauxdurs prouvettes pour essais de fatigue (ISO 3928:2016);Version anglaise EN ISO 3928:2016,Traduction anglaise de DIN EN ISO 3928:2017-03SupersedesDIN EN ISO 3928:200606www.beuth.deDocument c
4、omprises 16 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.02.17 DIN EN ISO 3928:2017-03 2 A comma is used as the decimal marker. National foreword This document (EN ISO 3928:2016) has been prepared by Technical Committee ISO/
5、TC 119 “Powder metallurgy”, Subcommittee SC 3 “Sampling and testing methods for sintered metal materials (excluding hardmetals)”. The responsible German body involved in its preparation was DIN-Normenausschuss Werkstofftechnologie (DIN Standards Committee Technology of Materials), Working Committee
6、NA 145-01-03 AA Probenahme und Prfverfahren fr Sintermetalle (ausgenommen Hartmetalle). The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 296 DIN 228-1 and DIN 228-2 ISO 1143 DIN 50113 Amendments This standard differs from DIN EN ISO 3928
7、:2006-06 as follows: a) Clause 2 and Clause 3 have been added; b) Clause 4 (formerly 2), Clause 5 (formerly 3), Clause 6 (formerly 4), and Clause 7 (formerly 5) have been revised; c) Subclause 4.4 has been added; d) Figure 1 has been added; e) the former Figures 1, 2, 3 and 4 have been assigned to C
8、lause 7 as Figures 2, 3, 4 and 5; f) the table from the former Figure 2 has been revised and included as new Table 1 in Figure 3. Previous editions DIN ISO 3928: 1990-10, 2001-02 DIN EN ISO 3928: 2006-06 DIN EN ISO 3928:2017-03 3 National Annex NA (informative) Bibliography DIN 228-1, Morse tapers a
9、nd metric tapers Taper shanks DIN 228-2, Morse tapers and metric tapers Taper sockets DIN 50113, Testing of metals Rotating bar bending fatigue test DIN EN ISO 3928:2017-03 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3928 November 2016 ICS 77.040.10; 7
10、7.160 Supersedes EN ISO 3928:2006English Version Sintered metal materials, excluding hardmetals - Fatigue test pieces (ISO 3928:2016) Matriaux mtalliques fritts, lexclusion des mtaux-durs - prouvettes pour essais de fatigue(ISO 3928:2016) Sintermetallwerkstoffe, ausgenommen Hartmetalle - Probekrper
11、fr die Ermdungsprfung(ISO 3928:2016) This European Standard was approved by CEN on 29 November 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up
12、-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by trans
13、lation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finlan
14、d, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION
15、COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3928:2016 EEuropean foreword .31 Scope . 52 Nor
16、mative references 53 Terms and definitions . 54 Pressed and sintered test pieces for fatigue test by reverse bend and axial testing . 54.1 General . 54.2 Test piece specification: unnotched 54.3 Test piece specification: notched 54.4 Load direction for bending fatigue testing 65 Die specifications .
17、 65.1 General . 65.2 Die specifications for unnotched test pieces . 65.3 Die specifications for notched test pieces . 66 Machined test pieces 67 Identification of test pieces . 7Annex A (informative) Remarks . 11Bibliography . 12Contents PageDIN EN ISO 3928:2017-03 EN ISO 3928:2016 (E) 2Foreword .4E
18、uropean foreword This document (EN ISO 3928:2016) has been prepared by Technical Committee ISO/TC 119 “Powder metallurgy“. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2017, and conflicting
19、 national standards shall be withdrawn at the latest by May 2017. 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 for identifying any or all such patent rights. This document supers
20、edes EN ISO 3928:2006. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of
21、 Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 3928:2016 has been approved b
22、y CEN as EN ISO 3928:2016 without any modification. DIN EN ISO 3928:2017-03 EN ISO 3928:2016 (E) 3 ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally ca
23、rried 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-governmental, in liaison with ISO, also take part in the work
24、. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the differ
25、ent approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may
26、be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents
27、).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Org
28、anization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 119, Powder metallurgy, Subcommittee SC 3, Sampling and testing for sintered metal materials (excluding hardmetals).This thir
29、d edition cancels and replaces the second edition (ISO 3928:1999), which has been technically revised.DIN EN ISO 3928:2017-03 EN ISO 3928:2016 (E) 4 1 ScopeThis document specifies the die cavity dimensions used for making fatigue test pieces by pressing and sintering, together with certain dimension
30、s of the test piece obtained from such a die, and the dimensions of the test pieces machined from sintered and powder forged materials.This document is applicable to all sintered metals and alloys, excluding hardmetals.2 Normative referencesThere are no normative references in this document.3 Terms
31、and definitionsNo terms and definitions are listed in this document.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp4 Presse
32、d and sintered test pieces for fatigue test by reverse bend and axial testing4.1 GeneralThe pressed and sintered piece may also be subjected to further treatment, such as sizing, polishing or heat treatment. If such treatments are applied, they shall be stated in the test report. In a metallographic
33、ally examined cross section of a test piece, in the gauge region, the piece shall show no micro-lamination greater than 0,25 mm in length. The press tool shall be maintained in a good condition to avoid excessive burr. The edges of the sintered parts shall be broken in the gauge area to remove any b
34、urr from compaction.4.2 Test piece specification: unnotchedFigure 2 a) shows a drawing of the unnotched test piece. The flatness and parallelism of 0,1 mm are mandatory. The other dimensions are advisory.4.3 Test piece specification: notchedFigure 3 a) shows a drawing of the notched test piece. The
35、flatness and parallelism of 0,1 mm are mandatory. The other dimensions are advisory. As the 5,5 mm tooling radius of the die is subject to wear, the corresponding radius dimension of the test piece shall be reported.DIN EN ISO 3928:2017-03 EN ISO 3928:2016 (E) 5 4.4 Load direction for bending fatigu
36、e testingIf nothing else is stated, the specimens shall be oriented such that the torque vector is parallel to the pressing direction during compaction (see Figure 1).Key1 M standing orientationFigure 1 Fatigue testing5 Die specifications5.1 GeneralThe die should preferably be of hardmetal and its s
37、urface finish shall be such as to allow compression of test pieces under normal conditions. The die may include a small exit taper to facilitate ejection and avoid cracks or microlaminations in the test pieces. Die cavity may be tapered 0,01 per side to aid ejection. Die bore may be enlarged by 0,5
38、% for tooling to be used for repressing.The die should be well supported with shrink rings (of internal diameter 120 mm +0010,mm), so as to minimize lateral expansion during compacting. Such support decreases the possibility of cracking of the specimen at ejection. To reduce the incidence of cracks
39、in the specimen, it is recommended to use top punch hold down during ejection.5.2 Die specifications for unnotched test piecesThe recommended die cavity is shown in Figure 2 b).Despite the expression “unnotched”, the test piece shows a stress concentration factor, Kt, as defined in Table 1.5.3 Die s
40、pecifications for notched test piecesThe recommended die cavities are shown in Figure 3 b).The stress concentration factor, Kt, depends upon radius, r, as defined in Table 1.6 Machined test piecesMany types of machined test pieces may be used according to the different known procedures of fatigue te
41、sting (rotating beam, axial loading, reverse bending, etc.), except that it is not recommended to prepare machined test pieces with square or rectangular cross sections.DIN EN ISO 3928:2017-03 EN ISO 3928:2016 (E) 6 An example of the rotating beam piece, is given in Figure 4. For details, see Annex
42、A and References 1, 2, 3 and 4.Figure 5 shows an example of a test piece for axial loading fatigue testing. For details, see Annex A and References 1, 2, 3 and 4.The machined test pieces shall be ground over their active length, using a diamond wheel, and lapped longitudinally in order to remove all
43、 traces of circumferential scratches. Final polishing should be in the longitudinal direction (no circumferential scratch lines should be visible); try to achieve a smooth blend with no undercut.Cold work and stresses from machining significantly increase the yield strength of austenitic stainless s
44、teel. Annealing or stress relieving may be required to duplicate the as-sintered structure. Any such heat treatment shall be reported.Practical experience with fatigue testing of carefully machined test pieces of circular cross section has shown that their endurance limits may be 20 % to 30 % higher
45、 than those obtained on unmachined, as-compacted test pieces with square or rectangular cross sections.Use progressively lighter machining passes to minimize residual stresses. Diameter in gauge length should be uniform within 0,025 mm.7 Identification of test piecesFor the identification of test pi
46、eces, the following shall be stated:a) a reference to this document, i.e. ISO 3928;b) the type of material;c) the density of test piece;d) the dimensions of test piece (thickness);e) when pressed and sintered test pieces are made according to Clause 4, the nature of any finishing treatment shall be
47、stated and also, preferably, the material and surface finish of the compacting tool;f) the form of test piece, i.e. figure number;g) the die material, i.e. tool steel or hardmetal/carbide;h) whether as-sintered or heat treated;i) the hardness of test piece according to heat treatment;j) the bottom of notch radius used on notched test piece, Figure 2.DIN EN ISO 3928:2017-03 EN ISO 3928:2016 (E) 7 Dimensions in millimetresa) Test pieceb) DieFigure 2 Unnotched test piece and compacting die for use with unnotched fatigue test piecesDIN EN ISO 3928:2017-03 EN ISO 3928:2016 (E) 8
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