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/AMS4131D AEROSPACE MATERIAL SPECIFICATION AMS 4131 REV. D Issued 1973-12 Revised
5、2005-08 Reaffirmed 2011-11 Superseding AMS 4131C Aluminum Alloy, Die and Hand Forgings 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (7075-T74) Solution Heat Treated and Aged (Composition similar to UNS A97075) RATIONALE This document has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE: 1.
6、1 Form: This specification covers an aluminum alloy in the form of die forgings and hand forgings. 1.2 Application: These forgings have been used typically for parts requiring a combination of good strength and resistance to stress-corrosion cracking, but usage is not limited to such applications. 2
7、. 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 may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced
8、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, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or www.sae.org. AMS 2355 Quality Assurance Sampling and Testing, Aluminum All
9、oys and Magnesium Alloys, Wrought Products, Except Forging Stock, and Rolled, Forged, or Flash Welded Rings AMS 2772 Heat Treatment of Aluminum Alloy Raw Materials AMS 2808 Identification, Forgings AS1990 Aluminum Alloy Tempers SAE AMS 4131D Page 2 of 9 2.2 ASTM Publications: Available from ASTM, 10
10、0 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959 or www.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 Examination 3. TECHNICAL R
11、EQUIREMENTS: 3.1 Composition: Shall conform to the percentages by weight shown in Table 1, determined in accordance with AMS 2355. TABLE 1 - Composition Element min max Zinc 5.1 6.1 Magnesium 2.1 2.9 Copper 1.2 2.0 Chromium 0.18 0.28 Iron - 0.50 Silicon - 0.40 Manganese - 0.30 Titanium - 0.20 Other
12、Impurities, each - 0.05 Other Impurities, total - 0.15 Aluminum remainder 3.2 Condition: Solution heat treated and aged in accordance with AMS 2772 to the T74 temper (See AS1990). SAE AMS 4131D Page 3 of 9 3.3 Properties: Forgings shall conform to the following requirements, determined in accordance
13、 with AMS 2355: 3.3.1 Tensile Properties: Shall be as follows: 3.3.1.1 Die Forgings: 3.3.1.1.1 With Grain Flow: Specimens, machined from forgings 6 inches and under in nominal thickness at time of heat treatment or from prolongations on such forgings with axis of specimen in area of gage length vary
14、ing not more than 15 degrees from parallel to forging flow lines, shall have the properties shown in Table 2 provided the as-forged thickness was not more than twice the heat treated thickness. TABLE 2A - Minimum Tensile Properties, Inch/Pound Units Nominal Thickness at Time of Heat TreatmentInches
15、Tensile Strengthksi Yield Strengthat 0.2% Offsetksi Elongation in 4D % Up to 3, incl 76.0 66.0 7 Over 3 to 4, incl 73.0 63.0 7 Over 4 to 5, incl 70.0 61.0 7 Over 5 to 6, incl 68.0 58.0 7 TABLE 2B - Minimum Tensile Properties, SI Units Nominal Thickness at Time of Heat TreatmentMillimeters Tensile St
16、rengthMPa Yield Strengthat 0.2% OffsetMPa Elongation in 4D % Up to 76.2, incl 524 455 7 Over 76.2 to 101.6, incl 503 434 7 Over 101.6 to 127.0, incl 483 421 7 Over 127.0 to 152.4, incl 469 400 7 3.3.1.1.2 Across Grain Flow: Specimens, machined from forgings 6 inches and under in nominal thickness at
17、 time of heat treatment or from prolongations on such forgings with axis of specimen in area of gage length varying not more than 15 degrees from perpendicular to forging flow lines, shall have the properties shown in Table 3 provided the as-forged thickness was not more than twice the heat treated
18、thickness. If configuration of the forging or prolongation cannot accommodate the transverse specimen described, acceptance of the forgings shall be based on testing as in 3.3.1.1.3. SAE AMS 4131D Page 4 of 9 TABLE 3A - Minimum Tensile Properties, Inch/Pound Units Nominal Thickness at Time of Heat T
19、reatment Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 4D % Up to 3, incl 71.0 62.0 4 Over 3 to 4, incl 70.0 60.0 4 Over 4 to 5, incl 68.0 58.0 4 Over 5 to 6, incl 65.0 55.0 4 TABLE 3B - Minimum Tensile Properties, SI Units Nominal Thickness at Time of Heat Treatment Mi
20、llimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 4D % Up to 76.2, incl 490 427 4 Over 76.2 to 101.6, incl 483 414 4 Over 101.6 to 127.0, incl 469 400 4 Over 127.0 to 152.4, incl 448 379 4 3.3.1.1.2.1 Elongation requirements shall not apply to specimens having a gage len
21、gth diameter less than 0.250 inch or located in immediate proximity to an abrupt change in thickness or located so that any part of the specimen gage length is located within 1/8 inch of the trimmed flash line. 3.3.1.1.3 At Angle to Flow Lines: Specimens, machined from forgings 6 inches and under in
22、 nominal thickness at time of heat treatment or from prolongations on such forgings with axis of specimen in area of gage length varying more than 15 degrees from parallel and also more than 15 degrees from perpendicular to forging flow lines, shall have the properties shown in Table 3. Such test re
23、sults shall be identified as neither longitudinal nor transverse tensile results. 3.3.1.2 Hand Forgings: Specimens, machined from forgings having an essentially square or rectangular cross section, shall have the properties shown in Table 4 provided the as-forged thickness does not exceed 6 inches.
24、SAE AMS 4131D Page 5 of 9 TABLE 4A - 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 Longitudinal 73.0 63.0 9 Long-Trans. 71.0 60.0 5 Over 2 to
25、 3, incl Longitudinal 73.0 63.0 9 Long-Trans. 71.0 60.0 5 Short-Trans. 69.0 60.0 4 Over 3 to 4, incl Longitudinal 71.0 61.0 9 Long-Trans. 70.0 58.0 5 Short-Trans. 68.0 57.0 4 Over 4 to 5, incl Longitudinal 68.0 57.0 8 Long-Trans. 67.0 56.0 5 Short-Trans. 66.0 55.0 4 Over 5 to 6, incl Longitudinal 65
26、.0 54.0 8 Long-Trans. 64.0 52.0 5 Short-Trans. 63.0 52.0 4 TABLE 4B - Minimum Tensile Properties, SI 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 50.8, incl Longitudinal 503 434 9 Long-Tr
27、ans. 490 414 5 Over 50.8 to 76.2, incl Longitudinal 503 434 9 Long-Trans. 490 414 5 Short-Trans. 476 414 4 Over 76.2 to 101.6, incl Longitudinal 490 421 9 Long-Trans. 483 400 5 Short-Trans. 469 393 4 Over 101.6 to 127.0, incl Longitudinal 469 393 8 Long-Trans. 462 386 5 Short-Trans. 455 379 4 Over 1
28、27.0 to 152.4, incl Longitudinal 448 372 8 Long-Trans. 441 359 5 Short-Trans. 434 359 4 SAE AMS 4131D Page 6 of 9 3.3.1.3 Special Purpose Forgings: Tensile property requirements for specimens cut from special purpose forgings shall be as specified on the drawing or as agreed upon by purchaser and ve
29、ndor. 3.3.2 Conductivity: Shall be as follows, determined in accordance with AMS 2355. 3.3.2.1 If the conductivity is 40% IACS (International Annealed Copper Standard) or higher and tensile properties meet specified requirements, forgings are acceptable. 3.3.2.2 If the conductivity is 38.0 to 39.9%
30、IACS, inclusive, if tensile properties meet specified requirements, and if the tensile yield strength in the long-transverse direction does not exceed the specified minimum by more than 11.9 ksi (82 MPa), forgings are acceptable. 3.3.2.3 If the conductivity is below 40.0% IACS and the tensile yield
31、strength in the long-transverse direction exceeds the specified minimum value by more than 11.9 ksi (82 MPa), the forgings shall be given additional aging heat treatment. If, after such treatment, forgings meet the requirements of 3.3.1 and 3.3.2.1 or 3.3.2.2, the forgings are acceptable. 3.3.2.4 If
32、 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 cracking when stressed in the short-transverse direction (pe
33、rpendicular to grain flow) to 35.0 ksi (241 MPa) for forgings 3 inches (76 mm) and under in nominal thickness and to 50% of the longitudinal (parallel to grain flow) yield strength for forgings over 3 inches (76 mm) in nominal thickness. 3.3.4 Grain flow of die forgings, except in areas which contai
34、n flash line end grain, shall follow the general contour of the forgings showing no evidence of re-entrant grain flow. 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
35、 forgings. 3.4.1 All forgings shall be subjected to ultrasonic inspection in accordance with ASTM B 594 and shall meet the following ultrasonic classes: 3.4.1.1 Die Forgings 0.50 to 4.00 Inches (127 to 101.6 mm), Inclusive, in Nominal Thickness and Weighing Not Over 300 Pounds: Class B. 3.4.1.2 Hand
36、 Forgings 1.00 to 6.00 Inches (25.4 to 152.4 mm), Inclusive, in Nominal Thickness and Weighing Not Over 600 Pounds: Class A. SAE AMS 4131D Page 7 of 9 3.4.2 Die forgings shall be etched to produce a surface suitable for visual examination of the forging surfaces for defect indications, such as seams
37、, laps, bursts, and quench cracks. Surface imperfections which can be removed and which do not reappear on re-etching and do not reduce required section thickness are acceptable. 3.4.3 All forgings shall be subjected to fluorescent penetrant inspection in accordance with ASTM E 1417. Acceptance stan
38、dards shall be as agreed upon by purchaser and vendor. 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
39、to perform any confirmatory testing 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 inspection (3.4.1), surface visual examination (3.4
40、.2) and fluorescent penetrant inspection (3.4.3) are acceptance tests and, except for composition, shall be performed on each inspection lot. 4.2.2 Periodic Tests: Stress-corrosion resistance (3.3.3) and grain flow of die forgings (3.3.4) are periodic tests and shall be performed at a frequency sele
41、cted by the vendor unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing: Shall be in accordance with AMS 2355 and the following: 4.3.1 Ultrasonic inspection (3.4.1), and, when specified, surface imperfections (3.4.2) and fluorescent penetrant inspection (3.4.3): All forgin
42、gs. 4.4 Reports: The vendor of the product shall furnish with each shipment a report stating that the product conforms to the composition, tolerances, ultrasonic testing, fluorescent penetrant inspection and showing the numerical results of tests on each inspection lot to determine conformance to th
43、e other test requirements. This report shall include the purchase order number, inspection lot number, AMS 4131D, size, and quantity. SAE AMS 4131D Page 8 of 9 4.5 Resampling and Retesting: Shall be in accordance with AMS 2355. 5. PREPARATION FOR DELIVERY: 5.1 Identification: Shall be in accordance
44、with AMS 2808. 5.2 Packaging: 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. 6. ACKNOWLEDGMENT: A v
45、endor 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 (|) loca
46、ted in 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 a specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including technic
47、al revision. Change bars and (R) are not used in original publications, nor in specifications that contain editorial changes only. 8.2 Hardness should be as shown in 8.2.1 or 8.2.2, determined in accordance with ASTM E 10. Hardness has been used to verify that forgings have been properly processed,
48、but an “out-of-range hardness number” is not always indicative of forgings with “out-of-specification tensile strength”. Further analysis including material composition verification, heat treat process parameter review, and/or tensile property measurement on forgings with out-of-range hardness may b
49、e necessary. 8.2.1 Die Forgings and Hand Forgings 3 Inches and Under in Nominal Thickness: Not lower than 135 HB/10/500 or 140 HB/10/1000. SAE AMS 4131D Page 9 of 9 8.2.2 Die Forgings and Hand Forgings Over 3 Inches in Nominal Thickness: As agreed upon by purchaser and vendor. 8.3 Terms used in AMS are clarified in ARP1917. 8.4 Purchase documents should specify not less than the following: AMS 4131D Type of forging (die or hand)
