1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23174-3 SANS 24497-1:2010Edition 1ISO 24497-1:2007Edition 1SOUTH AFRICAN NATIONAL STANDARD Non-destructive testing Metal magnetic memory P
4、art 1: Vocabulary This national standard is the identical implementation of ISO 24497-1:2007 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911
5、Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 24497-1:2010 Edition 1 ISO 24497-1:2007 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 135, Engineering materials Non-destructive testing, in accordance with proce
6、dures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in January 2010. Reference numberISO 24497-1:2007(E)ISO 2007INTERNATIONAL STANDARD ISO24497-1First edition2007-11-01Non-destructive testing Metal magnetic memory Part 1: Vocabu
7、lary Essais non destructifs Mmoire magntique des mtaux Partie 1: Vocabulaire SANS 24497-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 24497-1:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with
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12、stale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reservedSANS 24497-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 24497
13、-1:2007(E) ISO 2007 All rights reserved iiiForeword 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 through ISO technical committees. Each member
14、 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 collaborates closely with the International Elect
15、rotechnical 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 Standards. Draft International Standards adopte
16、d 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 this document may be the subject of patent
17、 rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 24497-1 was prepared by the International Institute of Welding, Commission V, Quality control and quality assurance of welded products, recognized as an international standardizing body in the field of weld
18、ing in accordance with Council Resolution 42/1999. Requests for official interpretations of any aspect of this part of ISO 24497 should be directed to the ISO Central Secretariat, who will forward them to the IIW Secretariat for an official response. ISO 24497 consists of the following parts, under
19、the general title Non-destructive testing Metal magnetic memory: Part 1: Vocabulary Part 2: General requirements Part 3: Inspection of welded joints SANS 24497-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 24497-1:2007(E) iv ISO 2
20、007 All rights reservedIntroduction The terms established in this part of ISO 24497 are located in a systematic order reflecting the system of concepts in the sphere of non-destructive testing by the method of metal magnetic memory. One standardized term is assigned to each concept. The definitions
21、given can be changed, if necessary, by entering derived features into them, revealing the meanings of terms used in them, and indicating the objects relating to the concept defined. The changes should not disturb the concept volume and content defined in this part of ISO 24497. Standardized terms ar
22、e printed in boldface font, and their reduced forms are represented by abbreviations (in boldface) or symbols (in lightface). SANS 24497-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 24497-1:2007(E) ISO 2007
23、 All rights reserved 1Non-destructive testing Metal magnetic memory Part 1: Vocabulary 1 Scope This part of ISO 24497 specifies terms and definitions for procedures in the sphere of non-destructive testing by the method of metal magnetic memory. The terms specified in this part of ISO 24497 are mand
24、atory for application in all types of documentation and literature in the sphere of non-destructive testing, using the method of metal magnetic memory included in the scope of standardization works and/or using the results of these works. 2 Terms and definitions For the purposes of this document, th
25、e following terms and definitions apply. 2.1 metal magnetic memory MMM after-effect which occurs as residual magnetization in components and welded joints formed in the course of their fabrication and cooled down to ambient temperatures under interaction with weak magnetic fields or due to irreversi
26、ble change of the local magnetization state of components in zones of stress concentration and damage under working NOTE Weak magnetic fields are the geomagnetic field of the planet Earth and other external fields in Rayleigh area. 2.2 self-magnetic-leakage field of the components SMLF magnetic-leak
27、age field occurring on the components surface in the zones of stable slip bands of dislocations under operational or residual stresses or in the zones of strong heterogeneity in the microstructure of the material NOTE SMLF characterizes MMM. 2.3 method of metal magnetic memory MMM method non-destruc
28、tive testing method based on the analysis of SMLF distribution on components surfaces for determination of stress concentration zones, imperfections, and heterogeneity in the microstructure of the material and in welded joints 2.4 magneto-dislocation hysteresis hysteresis curve due to the pinning of
29、 magnetic domain walls (Bloch walls) at dislocation clusters in weak magnetic fields SANS 24497-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 24497-1:2007(E) 2 ISO 2007 All rights reserved2.5 critical size of the local zones of in
30、stability of the shell (lcr) of a component minimal distance between the two nearest stable dislocation slip bands in material layers occurring at the moment of loss of shell stability of the component under the influence of loads NOTE This critical size is characterized by the distance between the
31、two nearest SMLF extreme values normalized on the value of the shell dimension. 2.6 SMLF intensity characteristic value of the magnetic-leakage field intensity measured on the component surface by the method of metal magnetic memory 2.7 SMLF gradient ratio between the difference of the magnetic-leak
32、age field intensity, measured at two adjacent scanning points and the distance between them 2.8 magnetic index (m) of the deformation capability of the material ratio between the maximum value of the SMLF gradient and the average value 2.9 limiting value (mlim) of the magnetic index of the material
33、deformation capability limiting value for the ratio between the maximum value of the SMLF gradient, corresponding to the metal tensile strength, and the average value of the SMLF gradient, corresponding to the material yield strength 2.10 SMLF measurement channel SMLF intensity measured with a singl
34、e flux-gate sensor 2.11 base distance between two SMLF measurement channels lbdistance between the two SMLF measurement channels installed at the scanning instrument during the sensor adjustment 2.12 SMLF diagram magnetic image of the graph reflecting the SMLF gradient along the scanning path 2.13 d
35、iscreteness unit of the SMLF intensity recording distance between two adjacent scanning points of the magnetic-leakage field intensity measurements 2.14 calibration of the equipment used to measure the metal magnetic memory adjustment of the sensors for the measurement of the magnetic-leakage field
36、by using a reference coil and of the position-sensing device by using a length-measurement reference standard 2.15 setting of equipment operational mode by the MMM method equipment adjustment according to the instrument main menu and described in the manual SANS 24497-1:2010This s tandard may only b
37、e used and printed by approved subscription and freemailing clients of the SABS .ISO 24497-1:2007(E) ISO 2007 All rights reserved 32.16 interference noise during measurements by the MMM method presence of factors distorting the SMLF of the inspection object (IO) NOTE Factors distorting the SMLF of t
38、he inspection object are the following: sources of strong and heterogeneous magnetic fields close to the test subject; presence of a foreign ferromagnetic product on the test subject and near the region of interest; presence of an external magnetic field and/or a welding electric current flow at the
39、 test subject; presence of a local artificial magnetization. SANS 24497-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 24497-1:2007(E) 4 ISO 2007 All rights reservedIndex B base distance between the two SMLF measurement channels 2.
40、11 C calibration of the equipment used to measure the metal magnetic memory 2.14 critical size of the local zones of instability of the shell of a component 2.5 D discreteness unit of the SMLF intensity recording 2.13 I interference noise during measurements by the MMM method 2.16 L limiting value o
41、f the magnetic index of the material deformation capability 2.9 M magnetic index of the deformation capability of the material 2.8 magneto-dislocation hysteresis 2.4 metal magnetic memory (MMM) 2.1 method of metal magnetic memory (MMM method) 2.3 S self-magnetic-leakage field of the components (SMLF
42、) 2.2 setting of equipment operational mode by the MMM method 2.15 SMLF diagram 2.12 SMLF gradient 2.7 SMLF intensity 2.6 SMLF measurement channel 2.10 SABSSANS 24497-1:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SABS Standards Divisi
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