1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2012 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMSA22771C AEROSPACE MATERIAL SPECIFICATION AMS-A-22771 REV. C Issued 1999-06 Revised 2012-09
5、 Superseding AMS-A-22771B Aluminum Alloy Forgings, Heat Treated RATIONALE AMS-A-22771C results from a Limited Scope Ballot to revise Mechanical Property Control of Production Parts (3.3.1.2), and to correct errors in referenced paragraphs present in revision B. NOTICE The initial SAE publication of
6、this document was taken directly from U.S. Military Standard MIL-A-22771D. This SAE Standard may retain the same part numbers established by the original military document. Any requirements associated with Qualified Products Lists (QPL) may continue to be mandatory for DoD contracts. Requirements re
7、lating to QPLs have not been adopted by the SAE for this standard and are not part of this SAE document. 1. SCOPE This specification has previously been widely used and may be required for production or processing of existing designs in the future. The Aerospace Materials Division, however, does not
8、 recommend this specification for future use in new designs (See 6.7). 1.1 Scope This specification covers the requirements for heat treated aluminum alloy die forgings, hand forgings, and ring forgings, produced under additional mechanical property control to ensure known mechanical properties for
9、parts used in aerospace critical applications. This specification also covers the requirements for forgings furnished in the F or 01 conditions which will ultimately be used in the heat treated condition. 1.2 Classification The aluminum alloy forgings shall be furnished in the following alloys, temp
10、ers, and forms, as specified (See 6.2.): 1.2.1 Alloys and Tempers 2014-F, O1, T6, T652 6061-F, O1, T6, T652 7049-F, O1, T73, T7352 2219-F, O1, T6, T852 6151-F, O1, T6, T652 7050-F, O1, T74, T7452 2618-F, O1, T61 7075-F, O1, T6, T652, T73, T7352, T74, T7452 7175-F, O1, T74, T7452, T7454 SAE AMS-A-227
11、71C Page 2 of 22 1.2.2 Form Forgings shall be furnished in the form of die forgings, hand forgings or ring forgings. If the form is not specified, manufacturers may use any form of forging most convenient. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purc
12、hase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published
13、 issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS2355 Quality Assurance Sampling and Testing of Aluminum Alloys and M
14、agnesium Alloys, Wrought Products (Except Forging Stock), and Rolled, Forged, or Flash Welded Rings AMS2430 Shot Peening, Automatic AMS2644 Inspection Material, Penetrant AMS2658 Hardness and Conductivity Inspection of Wrought Aluminum Alloy Parts AMS2772 Heat Treatment of Aluminum Alloy Raw Materia
15、ls AMS-STD-2154 Inspection, Ultrasonic, Wrought Metals, Process for 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B 660 Packaging/Packing of Aluminum and Magnesium Products ASTM E
16、 1417 Liquid Penetrant Testing ASTM G 47 Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products 2.3 Aerospace Industries Association Publications Available from the Aerospace Industries Association, 1000 Wilson Boulevard, Suite 1700, Arlington, VA 22209-3928
17、, www.aia-aerospace.org. NAS-410 Nondestructive Testing Personnel Qualification and Certification 2.4 Aluminum Association Publications Available from The Aluminum Association Inc., 1525 Wilson Blvd. Suite 600, Arlington, VA 22209, www.aluminum.org. International Alloy Designations and Chemical Comp
18、osition Limits for Wrought Aluminum and Wrought Aluminum Alloys (Teal Sheets) SAE AMS-A-22771C Page 3 of 22 2.5 Order of Precedence In the event of a conflict between the text of the specification and the references cited herein, the text of this specification shall take precedence. 3. REQUIREMENT 3
19、.1 Chemical Composition The chemical composition of the forgings shall be as specified in Table 1 (See 4.4.1). In case of a discrepancy in the values listed in Table 1 with those listed in the “International Alloy Designations and Chemical Composition Limits for Wrought Aluminum and Wrought Aluminum
20、 Alloys”(known as the “Teal Sheets”), the composition limits registered with the Aluminum Association and published in the “Teal Sheets” should be considered the controlling composition. 3.2 Heat Treatment Unless otherwise specified, forgings shall be heat treated in accordance with AMS2772. Forging
21、s of alloy 7175 shall be heat treated in a manner that the heat treated forgings shall conform to all the requirements of this specification (See 6.2.10). Discoloration due to heat treatment shall not be cause for rejection. 3.3 Mechanical Properties 3.3.1 Die Forgings Mechanical properties of die f
22、orgings as determined in accordance with 4.4.2 shall conform to the applicable properties specified in Tables 2 and 3. When die forgings are machined before heat treatment to sizes within the maximum section thickness specified in Tables 2 and 3, the mechanical properties in these tables are applica
23、ble, provided the as-forged thickness shall be not more than twice the heat treated thickness. For as-forged thickness greater than twice the heat treated thickness, the properties shall be as agreed between the contractor and the forging supplier or between the acquiring activity and the forging su
24、pplier or contractor (See 6.3.1). 3.3.1.1 Mechanical Property Control of First Production Parts After forging techniques have been established, a forging representative of the first production parts shall be tested. Tensile test specimens shall be taken from location both in the direction parallel t
25、o, within 15 degrees of flow lines, and not parallel to the forging flow lines. The specimen location should be indicated on the forging enginering drawing. If the specimen locations are not indicated on the forging engineering drawing, they shall be taken from areas representative of thick and thin
26、 sections. The flow lines shall be determined as specified in 4.4.7. The mechanical properties shall be as specified in Table 2 and 3. For forgings too small to yield suitable test specimens, the tension test shall be waived or negotiated between the contractor and the forging supplier or between th
27、e acquiring activity and the forging supplier or contractor (See 6.3.1). This mechanical property control shall be repeated after any major change in the forging process, forging stock size or forging stock. 3.3.1.2 Mechanical Property Control of Production Parts Samples for mechanical properties of
28、 production lots subsequent to the first production lot shall be taken as specified in AMS2355 and shall conform to the requirements of Table 2 and 3. 3.3.2 Hand Forgings The mechanical properties of hand forgings as determined in accordance with 4.4.2 shall conform to the applicable properties spec
29、ified in Table 4. The properties specified in Table 4 apply to hand forgings that are essentially rectangular in cross section. The requirement of long transverse and short transverse properties applies also to squares, even though transverse dimensions are equal. The forging process shall be contro
30、lled such that, the long transverse direction shall be perpendicular to the original stock axis, or both short transverse or long transverse properties shall meet the long transverse properties requirements. The direction of the long transverse properties shall be identified as specified in 3.8. For
31、 forgings too small to yield suitable test specimens, the method of tensile test shall be waived or negotiated between the contractor and forging supplier or between the acquiring activity and the forging supplier or contractor (See 6.3.1). SAE AMS-A-22771C Page 4 of 22 3.3.2.1 Large Hand Forgings F
32、or hand forgings (1) of greater thickness or (2) heat treated in section thickness greater than covered by this specification, or (3) when the purpose of conditions under which the forging is to be used so dictates, the requirements shall be as specified in the contract, order or drawing. In such ca
33、ses, the mechanical properties of test specimens taken from locations indicated on the drawing shall be as specified in the contract, order or drawing (See 6.3.1). 3.3.2.2 Machined Hand Forgings When hand forgings are machined before heat treatment, the section thickness at time of heat treatment sh
34、all determine the minimum mechanical properties as long as the original (as forged) thickness does not exceed the maximum thickness for the alloy as shown in Table 4. When the maximum thickness in Table 4 is exceeded by not more than 3 inches, the applicable thickness to establish properties shall b
35、e not less than half the original forged thickness. 3.3.3 Special Purpose Forgings Biscuits, octagons, mandrel rings, and contour hand forgings shall be classified as special purpose forgings. Mechanical properties of special purpose forgings shall be as negotiated between the contractor and the for
36、ging supplier or between the acquiring activity and the forging supplier or contractor (See 6.3.1). Testing to confirm mechanical properties shall be in accordance with 4.4.2. 3.3.4 Rolled Ring Forgings The mechanical properties of rolled ring forgings shall be determined in accordance with 4.4.2 an
37、d shall conform to applicable properties specified in Table 5. For forgings too small to yield suitable test specimens, the method of tensile test shall be waived or negotiated between the contractor and the forging supplier or between the acquiring activity and the forging supplier or contractor (S
38、ee 6.3.1). 3.3.5 Forging Supplied in “F” or “O1” Conditions The mechanical properties of forgings supplied in “F” or “O1” conditions shall meet the requirements of Tables 2, 3, 4, and 5, or as required by drawing or contract order when heat treated to specified tempers in accordance with AMS2772. 3.
39、4 Stress-Corrosion Cracking 3.4.1 Resistance to Stress-Corrosion Cracking Forgings of alloys 7049, 7050, 7075, and 7175 supplied in the T73, T7352, T74, T7452, and T7454 tempers shall meet the following acceptance criteria, as applicable, and shall exhibit no evidence of stress-corrosion cracking wh
40、en subjected to test specified in 4.4.8. 3.4.2 Acceptance Criteria for Stress-Corrosion Cracking by Conductivity Test The capability of individual lots (See 4.3.1) to resist stress-corrosion cracking shall be determined by testing as specified in 4.4.9, and using the acceptance criteria specified as
41、 follows for the applicable aluminum alloy and temper. 3.4.2.1 7049-T73 and 7049-T7352 The acceptance criteria for the 7049-T73 and 7049-T7352 aluminum alloy forgings shall be as follows: a. If the electrical conductivity is 40.0 percent International Annealed Copper Standards (IACS) or greater and
42、the tensile properties meet the minimum specified value, the lot is acceptable. b. If the electrical conductivity is 38.0 to 39.9 percent IACS, inclusive, and the longitudinal yield strength does not exceed the specified minimum by more than 9.9 ksi, the lot is acceptable. SAE AMS-A-22771C Page 5 of
43、 22 c. If the electrical conductivity is 38.0 to 39.9 percent IACS, inclusive, and the longitudinal yield strength exceeds the specified minimum by 10.0 ksi or more, the lot is acceptable provided it passes the stress-corrosion test specified in 4.4.8. d. If the electrical conductivity is less than
44、38.0 percent IACS, the lot is unacceptable. 3.4.2.2 7050-T74 and 7050-T7452 The acceptance criteria for the 7050-T74 and 7050-T7452 aluminum alloy forgings shall be as follows: a. If the electrical conductivity is 38.0 percent IACS or greater and the longitudinal yield strength (XX.X ksi) minus the
45、electrical conductivity (XX.X percent IACS) is equal to or less than 32.0, the lot is acceptable. For die forgings only, the maximum yield strength shall also be 72 ksi. b. If the electrical conductivity is 38.0 percent IACS or greater and the longitudinal yield strength (XX.X ksi) minus the electri
46、cal conductivity (XX.X percent IACS) is greater than 32.0, the lot is acceptable provided it passes the stress-corrosion test specified in 4.4.8. c. If the electrical conductivity is less than 38.0 percent IACS, the lot is unacceptable. 3.4.2.3 7075-T73, 7075-T7352, 7075-T74, 7075-T7452, 7175-T74, 7
47、175-T7452, and 7175-T7454 The acceptance criteria for the 7075-T73, 7075-T7352, 7075-T74, 7075-T7452, 7175-T74, 7175-T7452, and 7175-T7454 aluminum alloy forgings shall be as follows: a. If the conductivity is 40.0 percent IACS or higher and tensile properties meet the minimum values specified herei
48、n, the forgings shall be considered satisfactory. b. If the electrical conductivity is 38.0 to 39.9 percent IACS, inclusive, if tensile properties meet the minimum limits specified herein, and the longitudinal yield strength does not exceed the specified minimum by more than 11.9 ksi, the forgings s
49、hall be considered satisfactory. c. If conductivity is below 40.0 percent IACS and the longitudinal yield strength exceeds the specified minimum value by 12.00 ksi or more, the lot is unacceptable. d. If the conductivity is below 38.0 percent IACS, the material shall be considered unsatisfactory and must be reprocessed, regardless of property level. 3.5 Indications 3.5.1 Surface Indications Forgings shall be free of surface defects such as sea
