1、AECMA PREN*2003-9 9b 3032333 0030274 T54 AECMA STANDARD NORME AECMA AECMA NORM prEN 2003-9 Edition P 1 May 1996 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 ICs : Descriptors : ENGLISH VERSION A
2、erospace series Test methods Titanium and titanium alloys Part 9 : Determination of surface contamination Srie arospatiale Mthodes dessais Titane et alliages de titane Partie 9 : Dtermination de la contamination de surface Luft- und Raumfahrt Prfverfahren Titan und Titanlegierungen Teil 9 : Bestimmu
3、ng der Oberflchen- Verunreinigung This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerne
4、d Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination an
5、d signature of the AECMA Standard Checking Centre (NPS) and formai agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. I Nota - Extra copies can be supplied by B.N.A.E. - Technop
6、olis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ICSY-LEC-MOULINEAUX CEDEX I Comments should be sent within six months after the date of publication to I Edition approved for publication I 1996-05-31 AECMA Gulledelle 94 B-1200 BRUXELLES C5 Chairman Mr Odorico aecma 1996 Page 2 prEN 2003-9 : 1996 Co
7、ntents list O Foreword 1 Scope 2 Normative references 3 Definitions 4 Principle 5 Micrographic examination (Method A) 6 Hardness testing (Method B) 7 Test report Annex (Informative) AECMA PREN*2003-9 96 m 30323L3 0030276 A27 Page 3 prEN 2003-9 : 1996 O Foreword Contamination caused by an a-stabilize
8、r occurs in an environment containing oxygen, nitrogen or carbon when the product surface reaches a temperature which allows these elements to diffuse into the product surface. It leads to the formation of an a-stabilized surface which is hard and brittle, seldom exceeding 0,2 mm and is detrimental
9、to the product. 1 Scope This standard specifies two methods of determining surface contamination caused by an a-stabilizer on titanium and titanium alloys, for aerospace applications. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publi
10、cations. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revisio
11、n. For undated references the latest edition of the publication referred to applies. EN 2002-7 Aerospace series - Test methods for metallic materials - Part 7 : Hardness test 1) EN 31 14-1 Aerospace series - Test method - Microstructure of (a + ) titanium alloy wrought products - Part 1 : General re
12、quirements 2) 3 Definitions For the purposes of this standard, the following definitions apply : See EN 31 14-1. 4 Principle Determination of surface contamination is carried out by - micrographic examination (Method A) ; or - hardness testing (Method 6). 5 Micrographic examination (Method A) 5.1 Sa
13、mpling Unless otherwise specified the product shall be sampled in the delivery condition, such that the product surface can be examined at its transverse section. The location of the sample shall be at the discretion of the manufacturer, unless otherwise specified. The sampling procedure shall not r
14、esult in any heating which may lead to a contamination of the test sample. 1) Published as AECMA Prestandard at the date of publication of this standard 2) In preparation at the date of publication of this standard - - - - AECMA PREN*2003-9 96 3032333 0030277 763 Page 4 prEN 2003-9 : 1996 5.2 Proced
15、ure 5.2.1 Preparation of the micro-section The micro-section selected from the test sample shall be prepared by mechanical polishing. The method of preparation shall not cause any damage to the microstructure. It shall lead to sharp edges. The micro-section shall be etched, using an appropriate solu
16、tion e.g. : - 2 % to 5 % HF (hydrofluoric acid) ; - 40 % to 50 % 2-Propanol (isopropyialcohol) ; - water. - 2 % to 5 % HF (hydrofluoric acid) ; - 10 % to 20 % “03 (nitric acid) ; - water. or 5.2.2 Micro-examination Optical micro-examination shall be carried out with a magnification of 100 times to 5
17、00 times. 5.3 Expression of results Report any appearance of a white layer or an area with a high density of light colour a-phase (see annex), indicating the presence of surface contamination. 6 Hardness testing (Method BI 6.1 Sampling See 5.1. 6.2 Procedure 6.2.1 Preparation of the specimen The sec
18、tion to be inspected shall be prepared by mechanical polishing. This preparation shall not cause any alteration. It shall lead to sharp edges. 6.2.2 Tests Unless otherwise specified, Vickers hardness measurements shall be carried out under a load of 0,200 kg according to EN 2002-7 at the following l
19、ocations : - at least, three points at a distance I0,l mm from the section surface ; - at least, three points at about mid-thickness of the section. The average value of these measurements shall be calculated for each location. 6.3 Expression of results Report the difference between the two average
20、values. A difference between these values 50 HV, indicates surface contamination. - AECMA PREN*2003-9 96 1012311 0010278 bTT Page 5 prEN 2003-9 : 1996 7 Test report The test report shall refer to this standard and shall include : - complete identification of the tested product, including the manufac
21、turers name, designation and batch number ; - method used : micrographic examination (Method A) or hardness testing (Method B) ; - location of test sample ; - method of test sample preparation ; - all relevant test sample dimensions ; - date of test and traceability to individuals performing the tes
22、t work ; - equipment used ; - for micrographic examination (Method A) the etchant used ; - for hardness test (Method B), recorded individual and average hardnesses for the two test locations and the difference between the two averages ; - test results ; - any factor which may have affected the results and any deviation from the test method. Page 6 prEN 2003-9 : 1996 Annex (Informative) Examples of contamination Example no 1 (X 400) Example no 2 (X 250)
