1、 - AECIA PRENr368i.I 96 m LOL2311 0010478 4bL m I Edition approved for publication 1996-05-31 AECMA STANDARD NORME AECMA AECMA NORM C5 Chairman Mr Odorico Comments should be sent within six months after the date of publication to AECMA Gulledelle 94 B-I 200 BRUXELLES I prEN 3684 Edition P 1 May 1996
2、 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (321 2 775 81 10 - Fax. (32) 2 775 81 11 ICs : ENGLISH VERSION Aerospace series Test methods Titanium alloy wrought products Determination of transus temperature Metallographic method Srie
3、arospatiale Luft- und Raumfahrt Mthodes dessais Prfverfahren Demi-produits corroys en alliages de titane Dtermination de la temprature de transus Kneterzeugnisse aus Titanlegierungen Bestimmung der -Transus-Temperatur Mthode mtallographique Metallographisches Verfahren This “Aerospace Series“ Presta
4、ndard 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 Committee following comment by the Member countries.
5、 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 of the AECMA Standard Checking Centre INPSI and form
6、al 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. AECMA PREN*3684 96 = 303233L 0030479 3T8 Page 2 prEN 3684 : 1996 Contents list 1 Scope 2 Normative references 3 Definitions
7、 4 Principle 5 Procedure 6 Test report - AECMA PRENx3b4 76 - LOL23LL OOLO4O OLT Page 3 prEN 3684 : 1996 1 Scope This standard specifies the metallographic method for the determination of the transus temperature of titanium alloy wrought products for aerospace applications. 2 N ormatve references Thi
8、s European Standard incorporates by dated or undated reference provisions from other publications. 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 publica
9、tions apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 31 14-1 Aerospace series - Microstructure of (a + ) titanium alloy wrought products - Part 1 : General requirements 1) EN
10、3683 Aerospace series - Test methods - Titanium alloy wrought products - Determination of primary a content - Point count method and line intercept method 2) 3 Definitions For the purposes of this standard, the following definitions apply : See EN 31 14-1. 4 Principle The determination of transus te
11、mperature is carried out by assessment of primary a content of several test samples heat treated at different temperatures around the assumed transus temperature. The transus temperature lies between the heat treatment temperature of the test sample where the primary a content is O % and the next lo
12、wer heat treatment temperature of the sample where the primary CI content is O %. 5 Procedure 5.1 Sampling Sample material shall be as homogeneous as possible and with a fine grain distribution of CI and phases. If necessary, the sample material can be given additional deformation, e.g. by upsetting
13、 using normal forging temperatures in the (a + ) range. 5.2 Test pieces Individual test pieces are preferably cylindrical with dimensions of 10 mm in diameter and 10 mm in length or a 10 mm cube. The area to be examined shall preferably represent a transverse section. Their number shall be commensur
14、ate to the selected test temperatures (see 5.3). 1) In preparation at the date of publication of this standard. 2) Published as AECMA Prestandard at the date of publication of this standard - - AECMA PRENx3b84 b m 1012311 0010481 T5b m Page 4 prEN 3684 : 1996 5.3 Heat treatment The temperatures shal
15、l be selected around the assumed transus temperature. NOTE : For routine determination, three temperatures at 10 OC intervals are normally sufficient. A more precise determination may be possible by using smaller intervals. Each test piece shall be heated at the specified temperature f 5 OC and main
16、tained at this temperature between 15 min to 30 min. They shall then be immediately quenched in water. To improve microstructural contrast in a + alloys during metallographic inspection, it is recommended that the test pieces be subsequently annealed. 5.4 Metallographic examination The test pieces s
17、hall be cut in half and the sections shall be prepared and examined according EN 3683. 5.5 Expression of results Record the temperature at which the primary CI content is O % and the next lower temperature which the primary a content is O %. to at Express the transus temperature as a range limited b
18、y the above temperatures e.g. (1010/1020) OC. NOTE : The transus temperature may also be expressed by a single value extrapolated from the diagramme primary a content versus temperature. 6 Test report The test report shall refer to this standard and shall include : - complete identification of the t
19、ested product, including the manufacturers name, designation and batch number : location of test sample ; number and dimensions of test pieces ; heat treatment temperatures ; indication of any annealing ; test results according to EN 3683 ; equipment used ; date of test and traceability to individuals performing the test work ; test results (see 5.5) ; any factor which may have affected the results and any deviation from the test method.
