BS-ISO-13947-2007.pdf
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1、BRITISH STANDARD BS ISO 13947:2007 Metallic powders Test method for the determination of non-metallic inclusions in metal powders using a powder-forged specimen ICS 77.160 ? Licensed Copy: London South Bank University, London South Bank University, Sat Mar 17 04:10:04 GMT+00:00 2007, Uncontrolled Co
2、py, (c) BSI BS ISO 13947:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 March 2007 BSI 2007 ISBN 978 0 580 50331 3 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 13947:2007. The UK pa
3、rticipation in its preparation was entrusted to Technical Committee ISE/65, Sintered metal components. A list of organizations represented on ISE/65 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are respons
4、ible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Mar 17 04:10:04 GMT+00:00 2007, Uncontrolled Co
5、py, (c) BSI INTERNATIONAL STANDARD ISO 13947 First edition 2007-02-15 Reference number ISO 13947:2007(E) Metallic powders Test method for the determination of non-metallic inclusions in metal powders using a powder-forged specimen Poudres mtalliques Dtermination de la teneur en inclusions non mtalli
6、ques dans les poudres mtalliques laide dune prouvette forge de poudre BS ISO 13947:2007 Licensed Copy: London South Bank University, London South Bank University, Sat Mar 17 04:10:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank Universi
7、ty, Sat Mar 17 04:10:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iii Contents Page 1Scope 1 2Normative references 1 3Principle 2 4Significance and use . 2 5Apparatus . 2 6Test piece . 3 7Procedure . 3 8Test report 4 9Precision and bias . 4 BS ISO 13947:2007 Licensed Copy: London South Bank Univers
8、ity, London South Bank University, Sat Mar 17 04:10:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally
9、 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-governmental, in liaison with ISO, also take part in the w
10、ork. 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 main task of technical committees is to prepare Int
11、ernational 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. Attention is drawn to the possibility that some of
12、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 13947 was prepared by Technical Committee ISO/TC 119, Powder metallurgy, Subcommittee SC 2, Sampling and testing methods for powders (including powd
13、ers for hardmetals). BS ISO 13947:2007 Licensed Copy: London South Bank University, London South Bank University, Sat Mar 17 04:10:04 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Metallic powders Test method for the determination of non-metallic inclusions in metal powders using a powder-forged spec
14、imen SAFETY PRECAUTIONS This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this International Standard to establish appropriate safety and health practices and to determine the applicability of regulatory lim
15、itations prior to use. 1Scope This International Standard specifies a metallographic method for determining the non-metallic inclusion level in metal powders using a powder-forged specimen. The test method covers repress powder-forged test specimens in which there has been minimal lateral flow (). T
16、he core region of the powder-forged test specimen contains no porosity detectable at magnification. This test method can also be used to determine the non-metallic inclusion content of powder-forged steel parts. However, in parts where there has been a significant amount of material flow, the near-n
17、eighbour separation distance needs to be changed, or the inclusion sizes agreed between the parties need to be adjusted. This test method is not suitable for determining the non-metallic inclusion level of parts that have been forged such that the core region contains porosity. At the magnification
18、used for this test method, residual porosity is hard to distinguish from inclusions. Too much residual porosity makes a meaningful assessment of the inclusion population impossible. This test method may be applied to materials that contain manganese sulfide (admixed or prealloyed), provided the near
19、-neighbour separation distance is changed from to . 2Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including
20、any amendments) applies. ISO/TR 14321:1997, Sintered metal materials, excluding hardmetals Metallographic preparation and examination ASTM B 796-02, Standard test method for nonmetallic inclusion content of powders intended for powder forging (P/F) applications ASTM E 3-01, Standard practice for pre
21、paration of metallographic specimens ASTM E 768-99, Standard practice for preparing and evaluating specimens for automatic inclusion assessment of steel 1 % 100 30m15m BS ISO 13947:2007 Licensed Copy: London South Bank University, London South Bank University, Sat Mar 17 04:10:04 GMT+00:00 2007, Unc
22、ontrolled Copy, (c) BSI 2 3Principle A section representing the core region of the test specimen (part) is cut from the test piece (part) prior to metallographic grinding and polishing (mounting the section is optional). The polished sample is examined microscopically at a magnification of and a not
23、e is made of inclusions greater than a predetermined size. The maximum Ferets diameter is used to determine inclusion size. A Ferets diameter is a caliper diameter, as illustrated in Figure 1. The fragmented nature of some inclusions means that their size determination is somewhat complicated. The c
24、oncept of near-neighbour separation shall be used in determining inclusion size. According to this concept, if an inclusion is within a certain distance of its neighbouring particles, it is considered as a member of an inclusion cluster or agglomerate. Detected features within of one another are con
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