1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58products Determination of primary ! content Point count method and line intercept methodThe Europea
2、n Standard EN 3683:2007 has the status of a British StandardICS 49.025.30Aerospace series Test methods Titanium alloy wrought BRITISH STANDARDBS EN 3683:2007BS EN 3683:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2007 BSI 2007
3、ISBN 978 0 580 50597 3Amendments issued since publicationAmd. No. Date CommentsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.N
4、ational forewordThis British Standard was published by BSI. It is the UK implementation of EN 3683:2007.The UK participation in its preparation was entrusted by Technical Committee ACE/61, Metallic materials for aerospace purposes, to Panel ACE/61/-/49, Titanium and its alloys.A list of organization
5、s represented on this committee can be obtained on request to its secretary.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3683March 2007ICS 49.025.30English VersionAerospace series - Test methods - Titanium alloy wroughtproducts - Determination of primary a content - Point countmethod and line i
6、ntercept methodSrie arospatiale - Mthodes dessais - Demi-produitscorroys en alliages de titane - Dtermination de la teneuren a primaire - Mthode par comptage de points etmthode par interception de lignesLuft- und Raumfahrt - Prfverfahren - Kneterzeugnisse ausTitanlegierungen - Bestimmung von Primr-a
7、-Anteilen -Punktzhlverfahren und LinienschnittverfahrenThis European Standard was approved by CEN on 5 October 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any
8、alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by t
9、ranslationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, German
10、y, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManage
11、ment Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3683:2007: E!2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle4 5 Sampling and sa
12、mple preparation.4 6 Test methods4 7 Expression of results 7 8 Test report 7 EN 3683:20073 Foreword This document (EN 3683:2007) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the
13、rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical t
14、ext or by endorsement, at the latest by September 2007, and conflicting national standards shall be withdrawn at the latest by September 2007. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held re
15、sponsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, Fr
16、ance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3683:20074 1 Scope This standard specifies two methods, the point count method and
17、the line intercept method, for optical microscope determination of primary content of titanium alloy wrought products, for aerospace applications. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition
18、cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 3114-001, Aerospace series Test method Microstructure of ( + ) titanium alloy wrought products Part 001: General requirements. 3 Terms and definitions For the purposes of this
19、standard, the terms and definitions given in EN 3114-001 apply. 4 Principle Micrographic examination for determination of the primary content by: Counting the number of points of a specified point grid, enclosed in particles, point count method (Method A); Determining the lengths of lines of a speci
20、fied line grid intercepted by particles, line intercept method (Method B). 5 Sampling and sample preparation The test sample shall have a size such that the section to be examined shall not be less than 10 mm in diameter or square. The surface of the section shall be prepared according to EN 3114-00
21、1. 6 Test methods 6.1 Point count method (Method A) Superimpose the specified point grid (see example in Figure 1) on the section to be examined. Adjust magnification so that each primary particle does not coincide with more than one point of the grid: Assessment is carried out as follows: all those
22、 points on the grid which are enclosed by a primary particle are counted; a point lying exactly on a phase boundary is counted as 0,5 point; the sum N () of these points divided by the total number N of the grid points equals the amount of primary , Np; EN 3683:20075 Np corresponds to the volume (Vv
23、) of primary on the surface area covered by the point grid. NpN)(NvV = See Figure 1 for an example of the calculation. Figure 1 Illustration of the point count method The diamonds represent particles. The dots represent points of the grid. The crosses represent points enclosed within particles. EXAM
24、PLE Total number of points in the grid N = 25 The number of points enclosed by an particle N () = 7 Calculation of the content of : 0,28257N)(NNp = The statistical error (Vv) is calculated as follows: NNp)(1Np2=Vv It is recommended that the count be carried out at several locations within the surfac
25、e under examination to improve the accuracy of the determination by averaging. EN 3683:20076 6.2 Line intercept method (Method B) Superimpose the specified line grid (see example in Figure 2) on the section to be examined. Adjust magnification so that each primary particle in not intersected by more
26、 than one grid line in each direction. Assessment is carried out as follows: the lengths of all portions of the grid lines which lie over an particle are added to produce the total S (); this count shall be carried out in both directions of the grid; the value S () divided by the total length S of a
27、ll the grid lines within the surface under examination equals the grid line portion content NLattributable to the primary content and corresponds to the volume (Vv) of primary on the surface area covered by the line grid. VvS)(S = NLSee Figure 2 for an example of the calculation Figure 2 Illustratio
28、n of the line intercept method The diamonds represent particles. The square lines represent the grid. a + b = the length of the grid lines S(). EN 3683:20077 EXAMPLE Total length of all grid lines S = 900 mm The total of all a and b lengths S() = 204 mm Calculation of the content of primary : 0,2390
29、0204S)(S=The statistical error (Vv) is calculated as follows: Vv= 2 NLN11L)s(S(2+ where: s(S() is the standard deviation of line portion length distribution; L is the mean value of the line portion length; N is the number of intersected particles. It is recommended that the count be carried out at s
30、everal locations within the surface under examination to improve the accuracy of the determination by averaging. 7 Expression of results For each method, the individual or average values of primary content shall be given with the corresponding calculated statistical error. 8 Test report The test rep
31、ort shall refer to this standard and shall include: complete identification of the tested material, including the manufacturers name, designation and batch number; location of test sample; method of test sample preparation; all relevant test sample dimensions; date of test and traceability to indivi
32、duals performing the test work; test method used: point count method (Method A) or line intercept method (Method B); equipment used: type of grid; number of locations sampled; test results (see Clause 7); any factor which may have affected the results and any deviation from the test method. EN 3683:
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