1、AEROSPACE MATERIAL SPECIFICATIONAMS 4321AIssuedRevisedReaffirmedSuperseding AMS 4321Aluminum Alloy Forgings7.7Zn - 2.5Mg - 1.5Cu - 0.16Cr (7049-01)High Temperature AnnealedUNS A970491. SCOPE:1.1 Form: This specification covers an aluminum alloy in the form of die forgings, hand forgings, and forging
2、 stock.1.2 Application: These products have been used typically for parts to be machined prior to final heat treatment requiring a combination of dimensional stability and accentuation of ultrasonic response, and to achieve maximum mechanical properties with high resistance to stress-corrosion crack
3、ing after solution and precipitation heat treatment to T73 temper, but usage is not limited to such applications.2. APPLICABLE DOCUMENTS: The following publications form a part of this specification to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issu
4、e of other publications shall be the issue in effect on the date of the purchase order.2.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 2201 Tolerances, Aluminum and Aluminum Alloy Bar, Rod, Wire, and Forging Stock, Rolled or Cold FinishedMAM 2201 Toler
5、ances, Metric, Aluminum and Aluminum Alloy Bar, Rod, Wire, and Forging Stock, Rolled, Drawn, or Cold FinishedAMS 2355 Quality Assurance Sampling and Testing, Aluminum Alloys and Magnesium Alloys, Wrought Products, Except Forging Stock, and Rolled, Forged, or Flash Welded Rings1987-011993-012010-05SA
6、E 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 therefrom
7、, 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 2010 SAE International All rights reserved. No part of this publication may b
8、e 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 USA)
9、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/AMS4321A Copyright SAE International Provided by IHS under license with SAENot for ResaleNo repro
10、duction or networking permitted without license from IHS-,-,-AMS 4321A SAE AMS 4321A- 2 -2.1 (Continued):MAM 2355 Quality Assurance Sampling and Testing, Aluminum Alloys and Magnesium Alloys, Wrought Products, Except Forging Stock, and Rolled, Forged, or Flash Welded Rings, Metric (SI) UnitsAMS 2770
11、 Heat Treatment, Wrought Aluminum Alloy PartsAMS 2808 Identification, Forgings2.2 ASTM Publications: Available from ASTM, 1916 Race Street, Philadelphia, PA 19103-1187.ASTM B 594 Ultrasonic Inspection of Aluminum-Alloy Wrought Products for Aerospace ApplicationsASTM B 660 Packaging/Packing of Alumin
12、um and Magnesium ProductsASTM G 34 Exfoliation Corrosion Susceptibility in 2XXX and 7XXX Series Aluminum Alloys (EXCO Test)2.3 U.S. Government Publications: Available from Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.MIL-H-6088 Heat Treatment of
13、Aluminum Alloys3. TECHNICAL REQUIREMENTS: 3.1 Composition:Shall conform to the percentages by weight shown in Table 1, determined in accordance with AMS 2355 or MAM 2355.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without li
14、cense from IHS-,-,-AMS 4321A SAE AMS 4321A- 3 -3.2 Condition:The product shall be supplied in the following condition:3.2.1 Forgings: High temperature annealed (at solution heat treat temperature) in accordance with MIL-H-6088 except that forgings shall be ambient air cooled to room temperature.3.2.
15、2 Forging Stock: As ordered by the forging manufacturer.3.3 Properties:The product shall conform to the following requirements, determined in accordance with AMS 2355 or MAM 2355:3.3.1 Forgings: In the temper condition supplied.3.3.1.1 Conductivity within any one forging shall not vary more than 3%
16、IACS International Annealed Copper Standard (1.7 MS/m).3.3.2 Forgings: After being solution and precipitation heat treated in accordance with AMS 2770 to the T73 temper.3.3.2.1 Tensile Properties: Shall be as follows:3.3.2.1.1 Die Forgings: TABLE 1 - CompositionElement min maxZincMagnesiumCopperChro
17、miumIronSiliconManganeseTitaniumOther Impurities, eachOther Impurities, totalAluminum7.22.01.20.10-remainder8.22.91.90.220.350.250.200.100.050.15Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 43
18、21A SAE AMS 4321A- 4 -3.3.2.1.1.1 With Grain Flow: Specimens, machined from forgings not over 5 inches (127 mm) in nominal thickness with as-forged thickness not more than twice the heat treated thickness, with axis of specimen in area of gage length varying not more than 15 degrees from parallel to
19、 the forging flow lines or from prolongations on such forgings shall have the properties shown in Table 2.3.3.2.1.1.2 Across Grain Flow: Specimens, machined from forgings not over 5 inches (125 mm) in nominal thickness with as-forged thickness not more than twice the heat treated thickness, with axi
20、s of specimen in area of gage length varying not more than 15 degrees from perpendicular to the forging flow lines or from prolongations on such forgings shall have the properties shown in Table 3.TABLE 2A - Minimum Tensile Properties, Inch/Pound UnitsNominal Thickness at Timeof Heat TreatmentInches
21、TensileStrengthksiYield Strengthat 0.2% OffsetksiElongationin 4D%Up to 2, incl 72.0 62.0 7Over 2 to 4, incl 71.0 61.0 7Over 4 to 5, incl 70.0 60.0 7TABLE 2B - Minimum Tensile Properties, SI UnitsNominal Thickness at Timeof Heat TreatmentMillimetersTensileStrengthMPaYield Strengthat 0.2% OffsetMPaElo
22、ngationin 4D%Up to 51, incl 496 427 7Over 51 to 102, incl 490 421 7Over 102 to 127, incl 483 414 7Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 4321A SAE AMS 4321A- 5 -3.3.2.1.2 Hand Forgings:
23、Specimens machined from forgings having an essentially square or rectangular cross-section or from prolongations on such forgings shall have the properties shown in Table 4 provided the as-forged section thickness does not exceed 5 inches (127 mm).TABLE 3A - Minimum Tensile Properties, Inch/Pound Un
24、itsNominal Thickness at Timeof Heat TreatmentInchesTensileStrengthksiYield Strengthat 0.2% OffsetksiElongationin 4D%Up to 1, incl 71.0 61.0 3Over 1 to 3, incl 70.0 60.0 3Over 3 to 4, incl 70.0 60.0 2Over 4 to 5, incl 68.0 58.0 2TABLE 3B - Minimum Tensile Properties, SI UnitsNominal Thickness at Time
25、of Heat TreatmentMillimetersTensileStrengthMPaYield Strengthat 0.2% OffsetMPaElongationin 4D%Up to 25, incl 490 421 3Over 25 to 76, incl 483 414 3Over 76 to 102, incl 483 414 2Over 102 to 127, incl 469 400 2Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproducti
26、on or networking permitted without license from IHS-,-,-AMS 4321A SAE AMS 4321A- 6 -3.3.2.1.3 Special Purpose Forgings: Tensile specimens cut from special purpose forgings or from forgings beyond the size and configuration limits of Table 2, Table 3, and Table 4 or from prolongations on such forging
27、s shall have tensile properties as specified on the drawing or as agreed upon by purchaser and vendor.TABLE 4A - Minimum Tensile Properties, Inch/Pound UnitsNominal Thickness at Timeof Heat TreatmentInchesSpecimenOrientationTensileStrengthksiYield Strengthat 0.2% OffsetksiElongationin 4D%Over 2 to 3
28、, incl Longitudinal 71.0 61.0 9Long-Trans. 71.0 59.0 4Short-Trans. 69.0 58.0 3Over 3 to 4, incl Longitudinal 69.0 59.0 8Long-Trans. 69.0 57.0 3Short-Trans. 67.0 56.0 2Over 4 to 5, incl Longitudinal 67.0 56.0 7Long-Trans. 67.0 56.0 3Short-Trans. 66.0 55.0 2TABLE 4B - Minimum Tensile Properties, SI Un
29、itsNominal Thickness at Timeof Heat TreatmentMillimetersSpecimenOrientationTensileStrengthMPaYield Strengthat 0.2% OffsetMPaElongationin 4D%Over 51 to 76, incl Longitudinal 490 421 9Long-Trans. 490 407 4Short-Trans. 476 400 3Over 76 to 102, incl Longitudinal 476 407 8Long-Trans. 476 393 3Short-Trans
30、. 462 386 2Over 102 to 127, incl Longitudinal 462 386 7Long-Trans. 462 386 3Short-Trans. 455 379 2Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 4321A SAE AMS 4321A- 7 -3.3.2.1.4 Section thickne
31、ss at time of heat treatment shall determine the minimum mechanical properties provided the original as-forged thickness does not exceed the maximum thickness of 5 inches (127 mm) in Table 3 and Table 4. When the maximum thickness is over 5 to 8 inches (127 to 203 mm), the applicable thickness to es
32、tablish properties shall be not less than one-half the original forged thickness.3.3.2.2 Hardness: Forgings should have hardness not lower than shown in Table 5 but forgings shall not be rejected on the basis of hardness if the tensile property requirements of 3.3.2.1.1 or 3.3.2.1.2 are met.3.3.2.3
33、Exfoliation-Corrosion Resistance: Specimens cut from forgings shall show a level of exfoliation-corrosion less than that pictured in ASTM G 34, Photograph B, Figure 2, at any plane.3.3.2.4 Corrosion Resistance: Shall be as follows:3.3.2.4.1 Electrical Conductivity: Shall be as follows, determined on
34、 the surface of the sample:3.3.2.4.1.1 If the conductivity is 40.0% IACS (International Annealed Copper Standard) (23.2 MS/m) or higher and longitudinal tensile properties meet specified requirements, the forgings are acceptable.3.3.2.4.1.2 If the conductivity is 38.0 to 39.9% IACS (22.0 to 23.1 MS/
35、m), if the longitudinal 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 acceptable.3.3.2.4.1.3 If the conductivity is between 38.0 to 39.9% IACS (22.0 to 23.1 MS/m) and
36、longitudinal yield strength exceeds the specified minimum value by more than 9.9 ksi (68 MPa), the forgings shall be given additional precipitation heat treatment and be retested. If, after such treatment, the forgings meet the requirements of 3.3.2.4.1.1 and 3.3.2.4.1.2, the forgings are acceptable
37、.3.3.2.4.2 Alternate Immersion Test: Specimens from forgings 0.750 inch (19.05 mm) and over in least dimension shall show no evidence of stress-corrosion cracking when stressed in the short-transverse direction to 75% of the minimum yield strength specified for the principal test direction.TABLE 5 -
38、 Minimum HardnessNominal ThicknessInchesNominal ThicknessMillimetersHardnessHB/10/500HardnessHB/10/1000Up to 3, incl Up to 76, incl 135 140Over 3 to 4, incl Over 76 to 102, incl 125 130Over 4 to 5, incl Over 102 to 127, incl 119 124Over 5 Over 127 As Agreed Upon As Agreed UponCopyright SAE Internati
39、onal Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 4321A SAE AMS 4321A- 8 -3.3.3 Forging Stock: When a sample of stock is forged to a test coupon having a degree of mechanical working not greater than the forging and heat
40、 treated in the same manner as the forging, specimens taken from the heat treated coupon shall conform to the requirements of 3.3.2.1. If specimens taken from the stock after heat treatment in the same manner as forgings conform to the requirements of 3.3.2.1, the tests shall be accepted as equivale
41、nt to tests of a forged coupon.3.4 Quality:The product, 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 product.3.4.1 Grain flow of die forgings, except in areas which contain flash-line en
42、d grain, shall follow the general contour of the forgings showing no evidence of re-entrant grain flow.3.4.2 All hand forgings and, when specified, each die forging shall be subjected to ultrasonic inspection (See 8.2) in accordance with ASTM B 594 or other method specified by purchaser and shall me
43、et the following acceptance standards:3.4.2.1 Hand forgings 1 to 5 inches (25 to 127 mm) in nominal section thickness and weighing not more than 600 pounds (272 kg) shall meet Class A of ASTM B 594.3.4.2.2 Die forgings 0.500 to 4 inches (12.70 to 102 mm), inclusive, in nominal section thickness and
44、weighing not over 300 pounds (136 kg) shall meet Class B of ASTM B 594.3.4.2.3 Acceptance standards for forgings exceeding the dimensional or weight limits of 3.4.2.1 or 3.4.2.2 shall be as agreed upon by purchaser and vendor.3.5 Tolerances:Forging stock shall conform to all applicable requirements
45、of AMS 2201 or MAM 2201.4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of forgings shall supply all samples for vendors tests and shall be responsible for performing all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing dee
46、med necessary to ensure that the forgings conform to the requirements of this specification.4.2 Classification of Tests: 4.2.1 Acceptance Tests: Tests for composition (3.1), electrical conductivity (3.3.2.4.1), tensile properties (3.3.2.1), tolerances of forging stock (3.5) and, when specified, ultr
47、asonic soundness (3.4.2) are acceptance tests and shall be performed on each lot.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 4321A SAE AMS 4321A- 9 -4.2.2 Periodic Tests: Tests for hardness (
48、3.3.2.2), resistance to stress corrosion alternate immersion test (3.3.2.4.2), and grain flow of die forgings (3.4.1) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser.4.3 Sampling and Testing: Shall be in accordance
49、 with AMS 2355 or MAM 2355 and the following:4.3.1 Prolongations, which shall remain attached to the -01 forgings that they represent or remnants of the forging from the forgers capability testing, shall be identified for traceability to their production lot. These prolongations or remnants shall accompany the lot of forging
