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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this p
3、ublication may 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: +1 724-776-497
4、0 (outside USA) 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/AMS4247B AEROSPACE MATERIAL SPECIFICATION AMS 4247 REV. B Issued 1987-01 Revised
5、2006-05 Reaffirmed 2011-11 Superseding AMS 4247A Aluminum Alloy, Hand Forgings 7.7Zn - 2.4Mg - 1.6Cu - 0.16Cr (7049-T7352) Solution Heat Treated, Stress Relieved by Compression, and Precipitation Heat Treated (Composition similar to UNS A97049) RATIONALE This document has been reaffirmed to comply w
6、ith the SAE five-year review policy. 1. SCOPE 1.1 Form This specification covers an aluminum alloy in the form of hand forgings procured to inch/pound dimensions. 1.2 Application These forgings have been used typically for parts requiring a combination of high strength and resistance to stress-corro
7、sion cracking and for parts requiring stability during machining, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier ma
8、y 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 issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 4
9、00 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS 2355 Quality Assurance Sampling and Testing, Aluminum Alloys and Magnesium Alloys, Wrought Products, Except Forging Stock, and Rolled, Forged, or Flash Welded R
10、ings AMS 2772 Heat Treatment of Aluminum Alloy Raw Material AMS 2808 Identification, Forgings AS1990 Aluminum Alloy Tempers SAE AMS 4247B Page 2 of 5 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, ww
11、w.astm.org. ASTM B 594 Ultrasonic Inspection of Aluminum-Alloy Wrought Products for Aerospace Applications ASTM B 660 Packaging/Packing of Aluminum and Magnesium Products ASTM E 1417 Liquid Penetrant Inspection 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight show
12、n in Table 1, determined in accordance with AMS 2355. TABLE 1 - COMPOSITION Element min max Silicon - 0.25Iron - 0.35Copper 1.2 1.9 Manganese - 0.20Magnesium 2.0 2.9 Chromium 0.10 0.22Zinc 7.2 8.2 Titanium - 0.10Other Elements, each - 0.05Other Elements, total - 0.15Aluminum remainder 3.2 Condition
13、Solution heat treated, stress relieved by compression to produce 1 to 5% permanent set, and precipitation heat treated to the T7352 condition (See AS1990). Heat treatments shall be performed in accordance with AMS 2772. 3.3 Properties Forgings shall conform to the following requirements, determined
14、in accordance with AMS 2355 on the mill product: 3.3.1 Tensile Properties Specimens, machined from forgings having an essentially square or rectangular cross-section heat treated in the indicated thickness, shall have the properties shown in Table 2 provided as-forged thickness does not exceed 5 inc
15、hes (127 mm). SAE AMS 4247B Page 3 of 5 TABLE 2A - MINIMUM TENSILE PROPERTIES, INCH/POUND UNITS Nominal Thickness at Time of Heat Treatment Inches Specimen Orientation Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 4D % Up to 2, incl Over 2 to 3, incl Over 3 to 4, incl Over 4 t
16、o 5, incl Longitudinal Long-Trans. Longitudinal Long-Trans. Short-Trans. Longitudinal Long-Trans. Short-Trans. Longitudinal Long-Trans. Short-Trans. 71.0 71.0 71.0 71.0 69.0 69.0 69.0 67.0 67.0 67.0 66.0 59.0 57.0 59.0 57.0 56.0 57.0 54.0 53.0 54.0 53.0 51.0 9 4 9 4 3 8 3 2 7 3 2 TABLE 2B - MINIMUM
17、TENSILE PROPERTIES, SI UNITS Nominal Thickness at Time of Heat Treatment Millimeters Specimen Orientation Tensile Strength MPai Yield Strength at 0.2% Offset MPa Elongation in 50.8 mm or 4D % Up to 51, incl Over 51 to 76, incl Over 76 to 102, incl Over 102 to 127, incl Longitudinal Long-Trans. Longi
18、tudinal Long-Trans. Short-Trans. Longitudinal Long-Trans. Short-Trans. Longitudinal Long-Trans. Short-Trans. 490 490 490 490 476 476 476 462 462 462 455 407 393 407 393 386 393 372 365 372 365 352 9 4 9 4 3 8 3 2 7 3 2 3.3.1.1 Tensile specimens cut from special purpose forgings or from forgings beyo
19、nd the size and configuration limits of 3.3.1 shall have tensile properties as specified on the drawing or as agreed upon by purchaser and vendor. 3.3.2 Conductivity Shall be as follows: 3.3.2.1 If the conductivity is 40.0% IACS (International Annealed Copper Standard) or higher and tensile properti
20、es meet specified requirements, forgings are acceptable. 3.3.2.2 If the conductivity is 38.0 to 39.9% IACS, if the tensile properties meet specified requirements, and if the longitudinal yield strength does not exceed the specified minimum value by more than 9.9 ksi (68 MPa), the forgings are accept
21、able. 3.3.2.3 If the conductivity is below 40.0% IACS and the longitudinal yield strength exceeds the specified minimum value by more than 9.9 ksi (68MPa), the forgings shall be given additional precipitation heat treatment. If, after such treatment, the forgings meet the requirements of 3.3.1 and 3
22、.3.2.1 or 3.3.2.2, the forgings are acceptable. 3.3.2.4 If the conductivity is below 38.0% IACS, the forgings are not acceptable and shall be reprocessed regardless of tensile property level. 3.3.3 Stress-Corrosion Resistance Specimens cut from forgings shall show no evidence of stress-corrosion cra
23、cking when stressed to 75% of the specified minimum long-transverse yield strength. SAE AMS 4247B Page 4 of 5 3.4 Quality Forgings, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the forgings.
24、 3.4.1 All forgings shall be subjected to ultrasonic inspection in accordance with ASTM B 594 and shall meet Class A. 3.4.2 When specified, forgings shall be subjected to fluorescent penetrant inspection in accordance with ASTM E 1417. Standards for acceptance shall be established by the cognizant e
25、ngineering organization. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of forgings shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory test
26、ing deemed necessary to ensure that the forgings conform to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), tensile properties (3.3.1), conductivity (3.3.2), ultrasonic soundness (3.4.1), and, when specified, fluorescent penetrant inspection (3.4.2), are
27、 acceptance tests and, except for composition, shall be performed on each lot. 4.2.2 Periodic Tests Stress-corrosion resistance (3.3.3) is a periodic test and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shal
28、l be in accordance with AMS 2355. 4.4 Reports The vendor of forgings shall furnish with each shipment a report stating that the forging conforms to the composition and tolerances and showing the numerical results of tests on each inspection lot to determine conformance to the other acceptance test r
29、equirements. This report shall include the purchase order number, inspection lot number, AMS 4247B, size or part number, and quantity. 4.5 Resampling and Retesting Shall be in accordance with AMS 2355. 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be in accordance with AMS 2808. 5.2 Packaging
30、 Forgings shall be prepared for shipment in accordance with ASTM B 660 and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the forgings to ensure carrier acceptance and safe delivery. SAE AMS 4247B Page 5 of 5 6. ACKNOWLEDGMENT A vendo
31、r shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Forgings not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change bar (l) located in
32、 the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including technical
33、revisions. Change bars and (R) are not used in original publications, nor in specifications that contain editorial changes only. 8.2 Hardness Should be not lower than 135 HB/10/500 or 140 HB/10/1000 but forgings shall not be rejected on the basis of hardness if the tensile property requirements are
34、met. Hardness has been used to verify that product is properly processed, but an “out-of-range hardness number” is not always indicative of product with “out-of-specified tensile strength”. Further analysis, including material composition verification, heat treat process parameter review, and/or ten
35、sile property measurement of product with out-of-range hardness, may be indicated. 8.3 Terms used in AMS are clarified in ARP1917. 8.4 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are sho
36、wn as the approximate equivalents of the primary units and are presented only for information. 8.5 Purchase documents should specify not less than the following: AMS 4247B Size or part number of forgings desired Quantity of forgings desired Acceptance standards for fluorescent penetrant inspection, when specified (see 3.4.2). 8.6 Similar Specifications AMS-A-22771, Alloy 7049, Temper T7352, is listed for information only and shall not be construed as an acceptable alternate unless all requirements of this AMS are met. PREPARED BY AMS COMMITTEE “D“
