1、 AECMA PRENJ2715 96 m LOL2311 0010719 b7b m AECMA STANDARD prEN 271 5 NORME AECMA Edition P2 AECMA NORM February 1996 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 ICs : Supersedes issue PI Octob
2、er 1990 Descriptors : Edition approved for publication 1996-02-29 ENGLISH VERSION Comments should be sent within six months after the date of publication to AECMA Gulledelle 94 B-1200 BRUXELLES Aerospace series Macrographic examination of aluminium and aluminium alloy wrought products, forging stock
3、 and forgings Srie arospatiale Luft- und Raumfahrt Examen macrographique des produits corroys, des produits destins la forge et des pices forges ou matrices en aluminium ou en alliages daluminium Makrographische Untersuchung von Kneterzeugnissen aus Aluminium und Aluminiumlegierungen Schmiedevormate
4、rial und Schmiedestcke 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 concerned Technical
5、 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 and signature
6、 of the AECMA Standard Checking Centre INPSI and formal 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. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199
7、, rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX C5 Chairman Mr Odorico I I aecma 1996 COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services AECMA PRENx2715 96 H 10123LL 0010720 398 Page 2 prEN 2715 : 1996 Contents list 1 Scope
8、2 Selection of test samples 3 Preparation of test samples 4 Examination 5 Acceptance criteria COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesAECMA PRENx2715 96 L01231L 001072L 224 Page 3 prEN 2715 : 1996 1 Scope This standard specifies
9、 the procedure for the macrographic examination of the cut surface from aluminium and aluminium alloy wrought products, forging stock and forgings. It does not consider health and safety requirements. It is the responsibility of the user to adopt appropriate health and safety precautions when hazard
10、ous substances are involved. 2 Selection of test samples 2.1 All products except plate Samples shall be taken as required by the relevant technical specification, material standard, drawing, order or inspection schedule. 2.2 Plate Samples at least 200 rnrn long and from full thickness of the plate s
11、hall be taken normal to the rolling direction, as shown in figure 1. Figure 1 3 Preparation of test samples 3.1 Test samples from wrought products in heat treatable alloys which are not solution treated, shall be solution treated or solution treated and artificially aged in accordance with the mater
12、ial standard prior to being prepared for examination. Artificial ageing may be omitted if this facilitates macrographic examination. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services AECMA PRENx2735 b LO32333 0030722 3bO Reagents Page 4
13、prEN 2715 : 1996 Yo vol. 3.2 When required, the surface to be examined shall be suitably prepared by machining and/or polishing, prior to etching. The preparation shall not modify the macrographic structure or cause overheating. Hydrofluoric acid 40 % concentrated Demineralised or deionised water 3.
14、3 macrographic structure. The test sample shall be etched in a suitable reagent at ambient temperature to reveal the 3 37 The following reagents (solutions) are recommended but alternative solutions may be used by agreement between manufacturer and purchaser. Reagents Sulphuric acid 99 % concentrate
15、d Hydrofluoric acid 40 %O concentrated For non heat treatable alloys and AL-P6XXX- series alloy, see table 1 : % vol. 15 10 I Nitric acid 70 % concentrated I 30 I I Hydrochloric acid 35 % concentrated I 30 I For AL-P2XXX- series, AL-P-/XXX- series, and aluminium-lithium alloys, see table 2 : I Demin
16、eralised or deionised water I 75 I After etching, rinse in water, desmutt in nitric acid 70 % concentrated, rinse and dry. 4 Examination The test samples prepared in accordance with 3 shall be examined with the naked eye or at a magnification I 6 times. 5 Acceptance criteria The results of the examination shall meet the requirements of the relevant technical specification, material standard, drawing, order or inspection schedule. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services
