ISO-3325-1996.pdf

- STD-IS0 3325-ENGL 199b = q851703 OBbb705 217 INTERNATIONAL STANDARD IS0 3325 Second edition 1 996- 10-31 AMENDMENT 1 2001-02-01 Sintered metal materials, excluding hardmetals - Determination of transverse rupture strength AMENDMENT 1 : Precision statement Matériaux métalliques frittés à l'exclusion des métaux-durs - Détermination de la résistance à la rupture transversale AMENDEMENT 1: Données concernant la fidélité “This material is reproduced from IS0 documents under International Organization for Standardization (SO) Copyright License Number HIS/CC/1996. Not for resale. No part of these IS0 documents inay be reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with the prior written consent of IS0 (Case postale 56,121 i Geneva 20, Switzerland Fax +41 22 734 10 79), IHS or the IS0 Licensor's members. Reference number IS0 3325:1996/Amd.l:2001 (E) 0 IS0 2001 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:53:26 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-IS0 3325-ENGL 199b D q851903 O8bb90b 155 W IS0 33251 996/Amd.l:2001 (E) PDF disclaimer This PDF file may contain embedded îypefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The IS0 Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IS0 member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. o IS02001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IS0 at the address below or ISOs member body in the country of the requester. IS0 copyright office Case postale 56 CH-121 1 Geneva 20 Tel. + 41 22 749 O1 11 Fax +41 227490947 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland II 0 IS0 2001 - All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:53:26 MDTNo reproduction or networking permitted without license from IHS -,-,- STD=ISO 3325-ENGL L77b 9851703 OBbb707 091 IS0 3325:1996/Amd.l:2001(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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 pari in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on ail matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Pari 3. 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 YO of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this Amendment may be the subject of patent rights. IS0 shall not be held responsible for identifying any or all such patent rights. Amendment 1 to International Standard IS0 3325:1996 was prepared by Technical Committee ISOíK 11 9, Powder metallurgy, Subcommittee SC 3, Sampling and testing methods for sintered metal materials (excluding hardmetals). O IS0 2001 - Ali rights reserved . 111 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:53:26 MDTNo reproduction or networking permitted without license from IHS -,-,- STDaISO 3325-ENGL L77b = q853903 O8bbï08 T28 m IS0 3325:1996/Amd.l:2001(E) - Material a Rtr N/mm2 Iron, 490 0,5 % combined carbon Iron, 2 o / o Cu, 990 0,8 YO combined carbon Sintered metal materials, excluding hardmetals - Determination of transverse rupture strength R r N/mm2 N/mm2 38 97 86 145 AMENDMENT 1 : Precision statement Pre-alloyed 4 600, 2 % Cu, 0,8 % combined carbon Iron, 2 % Ni, 0,5 % combined carbon Heat treated Page 2, clause 6 Add the following subclause concerning a precision statement: 6 . 3 The values given in Table 1 were calculated for repeatability limit (r) and reproducibility limit (R). These values state that it is to be expected that when testing samples from any given lot, a laboratory will repeat its own measurements within the appropriate value of (r) 95 YO of the time and that a laboratory will duplicate the results of any other given laboratory within the larger value of (R), 95 YO of the time. Table 1 - Precision data 1 200 199 286 1 320 163 279 O IS0 2001 - All rights reserved 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:53:26 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-IS0 3325-ENGL 199b Liô51903 OBbb909 9bY Is0 33251 996/Amd.l:2001(E) ICs 77.040.1 O; 77.1 60 Price based on 1 page 0 IS0 2001 -All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:53:26 MDTNo reproduction or networking permitted without license from IHS -,-,- I NTE RNATI ON AL STANDARD IS0 3325 Second edition 1996-1 1-01 Sintered metal materials, excluding hardmetals - Determination of transverse rupture strength Matériaux métalliques frittés à l'exclusion des métaux-durs - Détermination de ia résistance à ia rupture transversale This material is reproduced from IS0 documents under International Organization for Standardization (EO) Copyright License number lHSllCCl1996. Not for resale. No part of these IS0 documents may be reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with the prior written consent of IS0 (Case postale 56,1211 Geneva 20, Swikerland, Fax +41 22 734 10 79), IHS or the IS0 Licensor's members. Reference number IS0 3325:1996(E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:53:26 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 3325:1996(E) = 4651903 Ob8429b l T 4 Foreword IS0 (the International Organization for Standardization) is a worldwide fed- eration of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be rep- resented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 col- laborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are cir- culated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 3325 was prepared by Technical Committee iSO/lC 1 19, Powder metallurgy, Subcommittee SC 3, Sampling and test- ing methods for sintered metal materials (excluding hardmetals). This second edition cancels and replaces the first edition (IS0 3325:1975), which has been technically revised. 8 IS0 1996 All rights reserved. Unless otherwise specified, no part of this publication may be repro- duced or utilized in any form or by any means, electronic or mechanical, including photo- copying and microfilm, without permission in writing from the publisher. International organization for Standardization Case Postale 56 CH-1 21 1 Genève 20 Switzerland Printed in Switzerland II Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:53:26 MDTNo reproduction or networking permitted without license from IHS -,-,- m Li851903 0b81i297 030 INTERNATIONAL STANDARD Q IS0 IS0 3325:1996(E) Sintered metal materials, excluding hardmetals - Determination of transverse rupture strength 1 Scope This International Standard specifies a method for the determination of the transverse rupture strength of sintered metal materials, excluding hardmetals. The method is particularly suitable for comparing the sin- tered strength of a batch of metal powder with that of a reference powder or with a reference strength. The method is applicable to sintered metal materials, excluding hardmetals, whether they have been sub- jected to heat treatment after sintering or not, and also to materials that have been sized or coined after sintering. ' It is specially suitable for materials having a uniform hardness throughout their section and negligible duc- tility, i.e. a ductility corresponding to a permanent deformation of less than about 0,5 mm measured between the two supports during the transverse rup- ture strength determination. If the test is applied to materials under conditions other than those specified above, the conditions shall be reported. NOTE 1 The permanent deformation can be measured with sufficient precision from the two fragments of the broken or cracked bar by indexing the lower surface. Alter- natively, the deflection of a straight line drawn horizontally on the side of the test piece can be measured using an optical instrument such as a measuring microscope or optical comparator. 2 Principle A test piece resting on two supports is broken by the application of a load at the midpoint between the sup- ports, under short-term static loading conditions. 3 Apparatus 3.1 Test equipment, of any type providing static loading conditions and an accuracy of f l %. The equipment shall have two support cylinders (rollers) with a fixed distance between them and a load-application cylinder (roller). All three cylinders shall be 3,2 mm f 0.1 mm in diameter and shall be made either of hardened steel with a hardness of at least 700 HV or of hardmetal. The support cylinders shall be mounted parallel to each other, and the distance between their centre- lines shall be either 25,O mm * 0,2 mm or 25.4 mm k 0,2 mm, measured with an accuracy of f O, 1 mm for the calculation. The load-application cylinder shall be mounted midway between the sup- port cylinders. For better accuracy, the mounting of the cylinders should preferably be such as to compensate for any deviation from parallelism between the top and bot- tom faces of the test piece. This can be accomplished by mounting the support cylinders so that each can be adjusted vertically (see figure 1). A diagrammatic arrangement of a typical test rig is shown in figure 1. The fixture should preferably be surrounded by a suit- able safety guard. 4 Test piece 4.1 The test piece shall be nominally 6 mm thick and produced from a die cavity of nominal dimensions 30 mm x 12 mm. The test piece thickness shall be uniform to within 0,l mm over the whole length and to within 0,04 mm across any width line perpendicular to the height and length. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:53:26 MDTNo reproduction or networking permitted without license from IHS -,-,- 4853903 0684298 7 ' 7 7 = IS0 3325:1996(E) Q IS0 4 . 2 Alternatively, machined test pieces may be used, in which case care shall be taken during machining to ensure that no stress raisers are introduced into the test piece. The test piece shall be cut with the 30 mm x 12 mm faces perpendicular to the compac- tion axis, on account of possible anisotropy, choosing a region of uniform density. Furthermore, the machin- ing technique employed to obtain the test piece shall not cause significant structural changes, such as den- sification when shearing a soft material or microstruc- tural changes produced by electro-erosion machining techniques. If such changes do occur, grinding to remove the disturbed material is recommended. 5 Procedure 5 . 1 Measure the width and thickness of the test piece at its midpoint to the nearest 0,Ol mm. 5 . 2 Place the test piece on one of its 30 mm x 12 mm faces symmetrically on the support cylinders so that its longitudinal axis is at 90“ -t 30' to the longi- tudinal axes of the cylinders. Precise positioning of the test piece can be easily ensured by pushing the side of the test piece up against a suitably located, remov- able stop. Apply a load at a position midway between the two cylinders. Increase the load slowly and stead- ily, so that the time to fracture is not less than 10 s. Record the value at which the load suddenly drops due to formation of the first crack. 5 . 3 Repeat the determination with a suitable number of test pieces. 6 Expression of results 6 . 1 The transverse rupture strength Rtr, in newtons per square millimetre, is given by the equation 3 FL tr - 2bh2 R - where F is the load, in newtons, required for fracture; L is the distance, in millimetres, between the supports; b is the width, in millimetres, of the test piece at right angles to its height; h is the height (thickness), in millimetres, of the test piece parallel to the direction of applica- tion of the test load. Report the arithmetical mean of the transverse rup- ture strength determinations, rounded to the nearest 10 N/mm2. 6.2 The absolute uncertainty of this