BS-ISO-16592-2006.pdf
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1、BRITISH STANDARD BS ISO 16592:2006 Microbeam analysis Electron probe microanalysis Guidelines for determining the carbon content of steels using a calibration curve method ICS 71.040.50 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:43:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS IS
2、O 16592:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 BSI 2006 ISBN 0 580 49320 2 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 16592:2006. The UK participation in its
3、preparation was entrusted to Technical Committee CII/9, Microbeam analysis. A list of organizations represented on CII/9 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applica
4、tion. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:43:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 16592:2006(E) INTERNATIONA
5、L STANDARD ISO 16592 First edition 2006-09-15 Microbeam analysis Electron probe microanalysis Guidelines for determining the carbon content of steels using a calibration curve method Analyse par microfaisceaux Analyse par microsonde lectronique (microsonde de Castaing) Lignes directrices pour le dos
6、age du carbone dans les aciers par la droite dtalonnage BS ISO 16592:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:43:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 05:43:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Conte
7、nts Page Foreword iv 1 Scope . 1 2 Procedure 1 2.1 General. 1 2.2 Reference materials 1 2.3 Specimen preparation 2 2.4 Measurement of carbon K X-ray intensity . 2 2.5 Background subtraction 4 2.6 Establishment of the calibration curve. 5 3 Evaluation of uncertainty. 6 4 Test report . 6 Annex A (info
8、rmative) Method to estimate the uncertainty of the calculated value using a calibration curve. 8 Annex B (informative) A practical example of the determination of the mass fraction of carbon and the evaluation of uncertainty in a steel. 10 Bibliography. 12 BS ISO 16592:2006 Licensed Copy: sheffieldu
9、n sheffieldun, na, Mon Nov 27 05:43:48 GMT+00:00 2006, 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 carried out thr
10、ough 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. ISO collabo
11、rates 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 International Stand
12、ards. 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 the elements of
13、this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 16592 was prepared by Technical Committee ISO/TC 202, Microbeam analysis, Subcommittee SC 2, Electron probe microanalysis. BS ISO 16592:2006 Licensed Copy: sheffiel
14、dun sheffieldun, na, Mon Nov 27 05:43:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Microbeam analysis Electron probe microanalysis Guidelines for determining the carbon content of steels using a calibration curve method 1 Scope This International Standard gives guidance on a method for the determ
15、ination of the carbon content in steels containing other alloying elements (less than 1 % to 2 % by mass) using the calibration curve method. It specifies the sample preparation, X-ray detection, establishment of the calibration curve and the procedure for the determination of the uncertainty of the
16、 measured carbon content. It is applicable to steels containing a mass fraction of carbon of less than 1,0 %. The method is not applicable to steels with higher carbon contents, which could significantly affect the accuracy of the analysis results. This International Standard applies to analyses per
17、formed using normal beam incidence and wavelength-dispersive X-ray spectrometry; it is not designed to be used for energy-dispersive X-ray spectrometry. 2 Procedure 2.1 General In order to determine the carbon content in steels using a calibration curve, suitable reference materials should be prepar
18、ed. For accurate analysis, extreme care should be used to prevent carbon contamination which would otherwise increase the apparent carbon content of the specimen. The measurement of C K intensity should be carried out using the same procedures for the specimen and the reference materials; that is, s
19、pecimen preparation, beam energy, beam current, beam diameter, point counting mode, step between points in case of line analysis, and also the method of background subtraction. 2.2 Reference materials To establish the calibration curve to determine the carbon content, a suitable reference material o
20、r set of reference materials should be used. Examples of reference materials are as follows: Fe-C solid solution reference materials which are manufactured by quenching from the austenite region at high temperature; these reference materials should be homogeneous and contain different carbon concent
21、rations; Fe-C compound Fe3C 1. Reference materials with a different C K peak shape compared to the unknown materials should not be used because the use of these reference materials causes a lowering of the quantitative accuracy. BS ISO 16592:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 2
22、7 05:43:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 2.3 Specimen preparation 2.3.1 General The presence of carbon and/or its compounds as contamination on the specimen surface as a result of specimen preparation significantly affects the accuracy of carbon analysis. Extreme care should be used t
23、o prevent this contamination. The specimen preparation (mounting, grinding and polishing) procedures should be the same for both the reference material and the unknown material. 2.3.2 Specimen mounting Although it is often possible to analyse a specimen without the use of a mounting medium, for smal
24、l or irregularly shaped specimens mounting will be necessary. It is important to realize that the mounting material can act as a source of carbon contamination. Various mounting media are available, such as Bakelite, copper- filled or aluminium-filled and even graphite-filled resins, and it is recom
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