1、BRITISH STANDARDBS ISO 24497-1:2007Non-destructive testing Metal magnetic memory Part 1: VocabularyICS 01.040.25; 25.160.40g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53
2、g44g42g43g55g3g47g36g58BS ISO 24497-1:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2007 BSI 2007ISBN 978 0 580 55671 5National forewordThis British Standard is the UK implementation of ISO 24497-1:2007. The UK participation
3、 in its preparation was entrusted to Technical Committee WEE/46, Non-destructive testing.A list of organizations represented on this committee 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 fo
4、r its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsReference numberISO 24497-1:2007(E)INTERNATIONAL STANDARD ISO24497-1First edition2007-11-01Non-destructive testing Metal magnetic memory
5、 Part 1: Vocabulary Essais non destructifs Mmoire magntique des mtaux Partie 1: Vocabulaire BS ISO 24497-1:2007ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Stand
6、ards is normally 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 ta
7、ke part in the work. 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 i
8、s to prepare International 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 possibili
9、ty that some of 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 24497-1 was prepared by the International Institute of Welding, Commission V, Quality control and quality assurance of welded produc
10、ts, recognized as an international standardizing body in the field of welding 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 f
11、or an official response. ISO 24497 consists of the following parts, under the general title Non-destructive testing Metal magnetic memory: Part 1: Vocabulary Part 2: General requirements Part 3: Inspection of welded joints BS ISO 24497-1:2007iv Introduction The terms established in this part of ISO
12、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 given can be changed, if necessary, by entering derived features into them, re
13、vealing 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 are printed in boldface font, and their reduced forms are represented by abbrevi
14、ations (in boldface) or symbols (in lightface). BS ISO 24497-1:20071Non-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 term
15、s specified in this part of ISO 24497 are mandatory 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 def
16、initions For the purposes of this document, the 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
17、 with weak magnetic fields or due to irreversible 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-leak
18、age field of the components SMLF magnetic-leakage 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 o
19、f metal magnetic memory MMM method non-destructive 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 hys
20、teresis hysteresis curve due to the pinning of magnetic domain walls (Bloch walls) at dislocation clusters in weak magnetic fields BS ISO 24497-1:20072 2.5 critical size of the local zones of instability of the shell (lcr) of a component minimal distance between the two nearest stable dislocation sl
21、ip 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 two nearest SMLF extreme values normalized on the value of the shell dimension. 2.6 SMLF intensity charact
22、eristic 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-leakage field intensity, measured at two adjacent scanning points and the distance between them 2.8 magnetic i
23、ndex (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 deformation capability limiting value for the ratio between the maximum value of the SMLF gradient, corres
24、ponding 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 single flux-gate sensor 2.11 base distance between two SMLF measurement channels lbdistance between the two SML
25、F 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 discreteness unit of the SMLF intensity recording distance between two adjacent scanning points of the magn
26、etic-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 by using a reference coil and of the position-sensing device by using a length-measurement reference stand
27、ard 2.15 setting of equipment operational mode by the MMM method equipment adjustment according to the instrument main menu and described in the manual BS ISO 24497-1:200732.16 interference noise during measurements by the MMM method presence of factors distorting the SMLF of the inspection object (
28、IO) NOTE Factors distorting the SMLF of the 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/
29、or a welding electric current flow at the test subject; presence of a local artificial magnetization. BS ISO 24497-1:20074 Index B base distance between the two SMLF measurement channels 2.11 C calibration of the equipment used to measure the metal magnetic memory 2.14 critical size of the local zon
30、es 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 of the magnetic index of the material deformation capability 2.9 M magnetic index of the deformation capability
31、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) 2.2 setting of equipment operational mode by the MMM method 2.15 SMLF diagram 2.12 SMLF gradient 2.7 SMLF int
32、ensity 2.6 SMLF measurement channel 2.10 BS ISO 24497-1:2007blankBS ISO 24497-1:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the intern
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