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 2014 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/AMS4320B AEROSPACE MATERIAL SPECIFICATION AMS4320 REV. B Issued 1981-07 Revised 2
5、005-09 Reaffirmed 2014-04 Superseding AMS4320A Aluminum Alloy Forgings 7.7Zn - 2.5Mg - 1.5Cu - 0.16Cr (7149-T73) Solution and Precipitation Heat Treated (Composition similar to UNS A97149) RATIONALE AMS4320B has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE: 1.1 Form: This
6、 specification covers an aluminum alloy in the form of die forgings, hand forgings, and forging stock. 1.2 Application: These forgings have been used typically for parts requiring high strength and resistance to stress-corrosion cracking, but usage is not limited to such applications. 2. APPLICABLE
7、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 document has
8、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 of Aluminum Alloys and Mag
9、nesium Alloys, Wrought Products (Except Forging Stock) and Flash Welded Rings AMS 2772 Heat Treatment of aluminum Alloy Raw Materials AMS 2808 Identification, Forgings AMS-STD-1537 Electrical Conductivity Test for Verification of Heat Treatment of Aluminum Alloys, Eddy Current Method AS1990 Aluminum
10、 Alloy Tempers SAE INTERNATIONAL AMS4320B Page 2 of 10 2.2 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959 or www.astm.org. 2.3 ANSI Publications: Available from ANSI, 25 West 43rdStreet, 4thFloor, New York, NY 10036 or www.ansi.org. ANS
11、I H 35.2 Dimensional Tolerances for Aluminum Mill Products ANSI H 35.2M Dimensional Tolerances for Aluminum Mill Products (Metric) 3. TECHNICAL REQUIREMENTS: 3.1 Composition: Shall conform to the percentages by weight, determined in accordance with AMS 2355. TABLE 1 - Composition Element min max Sil
12、icon - 0.15 Iron - 0.20 Copper 1.2 1.9 Manganese - 0.20 Magnesium 2.0 2.9 Chromium 0.10 0.22 Zinc 7.2 8.2 Titanium - 0.10 Other Elements, each - 0.05 Other Elements, total - 0.15 Aluminum remainder 3.2 Condition: The product shall be supplied in the following condition: 3.2.1 Die and Hand Forgings:
13、Solution and precipitation heat treated in accordance with AMS 2772 and as noted in 3.3 to the T73 temper (See AS1990). 3.2.2 Forging Stock: Forging stock used to produce forgings to this specification shall be ingot or wrought stock in the -F tempers. Forging stock ordered to this specification is
14、for manufacturing forgings defined in 3.2.1. Material shall comply with the requirements of Table 1. ASTM G 47 Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX High Strength Aluminum Alloy Products ASTM B 594 Ultrasonic Inspection of Aluminum-Alloy Wrought Products for Aerosp
15、ace Applications SAE INTERNATIONAL AMS4320B Page 3 of 10 3.3 Heat Treatment: Shall be performed in accordance with AMS 2772 except as follows: 3.3.1 Solution Heat Treatment: Heat to 875 F 10 (468 C 6), hold at heat for not less than 60 minutes, and quench in water at 130 to 150 F (54 to 66 C). 3.3.2
16、 Holding Period: Hold at room temperature for not less than 48 hours. 3.3.3 Precipitation Heat Treatment: Heat to 250 F 10 (121 C 6), hold at heat for 24 hours 1, increase temperature to 330 F 5 (166 C 3), hold at heat for 14 hours 0.5, and cool in air. For section thicknesses over 4 inches (102 mm)
17、, the second step may be reduced to 325 F 5 (163 C 3). 3.3.3.1 The practices for the second step of the precipitation heat treatment are recommendations; some adjustments may be necessary depending on furnace equipment, size of load, forging configuration, etc. 3.4 Properties: The product shall conf
18、orm to the following requirements, determined in accordance with AMS 2355: 3.4.1 Forgings: 3.4.1.1 Tensile Properties: Shall be as follows: 3.4.1.1.1 Separately Forged Test Specimens: Shall be as follows in Table 2, determined on specimens machined from separately-forged coupons representing the for
19、gings and heat treated with the forgings or machined from prolongations on heat treated forgings: TABLE 2 - Minimum Tensile Properties Property Value Tensile Strength, minimum 72.0 ksi (496 MPa) Yield Strength at 0.2% Offset 62.0 ksi (427 MPa) Elongation in 4D 7% SAE INTERNATIONAL AMS4320B Page 4 of
20、 10 3.4.1.1.2 Die Forgings: 3.4.1.1.2.1 With Grain Flow: Specimens, machined from forgings with axis of specimen in area of gage length varying not more than 15 degrees from parallel to forging flow lines, shall have the properties shown in Table 3. TABLE 3A - Minimum Tensile Properties, Inch/Pound
21、Units Nominal Thickness at Time of Heat Treatment Inches Tensile Strength ksi Yield Strength At 0.2% Offset ksi Elongation In 4D % Up to 2, incl 72.0 62.0 7 Over 2 to 4, incl 71.0 61.0 7 Over 4 to 5, incl 70.0 60.0 7 TABLE 3B - Minimum Tensile Properties, SI Units Nominal Thickness at Time of Heat T
22、reatment Millimeters Tensile Strength MPa Yield Strength At 0.2% Offset MPa Elongation In 4D % Up to 51, incl 496 427 7 Over 51 to 102, incl 490 421 7 Over 102 to 127, incl 483 414 7 3.4.1.1.2.2 Across Grain Flow: Specimens, machined from forgings with axis of specimen in area of gage length varying
23、 not more than 15 degrees from transverse to forging flow lines, shall have the properties shown in Table 4. TABLE 4A - Minimum Tensile Properties, Inch/Pound Units Nominal Thickness at Time of Heat Treatment Inches Tensile Strength ksi Yield Strength At 0.2% Offset ksi Elongation In 4D % Up to 1, i
24、ncl 71.0 61.0 3 Over 1 to 3, incl 70.0 60.0 3 Over 3 to 4, incl 70.0 60.0 2 Over 4 to 5, incl 68.0 58.0 2 TABLE 4B - Minimum Tensile Properties, SI Units Nominal Thickness at Time of Heat Treatment Millimeters Tensile Strength MPa Yield Strength At 0.2% Offset MPa Elongation In 4D % Up to 25, incl 4
25、90 421 3 Over 25 to 76, incl 483 414 3 Over 76 to 102, incl 483 414 2 Over 102 to 127, incl 469 400 2 SAE INTERNATIONAL AMS4320B Page 5 of 10 3.4.1.1.2.2.1 Elongation requirements do not apply to specimens having a gage-length diameter under 0.250 inch (6.35 mm), or located in immediate proximity to
26、 an abrupt change in section thickness, or located so that any part of the specimen gage length is located within 0.125 inch (3.18 mm) of the trimmed flash line. 3.4.1.1.3 Hand Forgings: Specimens, machined from forgings having an essentially square or rectangular cross-section heat treated in the i
27、ndicated thickness shall have the properties shown in Table 5 provided as-forged section thickness does not exceed 5 inches (127 mm). TABLE 5A - Minimum Tensile Properties, Inch/Pound Units Nominal Thickness at Time of Heat Treatment Inches Specimen Orientation Tensile Strength ksi Yield Strength At
28、 0.2% Offset ksi Elongation In 4D % 2 to 3, incl Longitudinal Long-Trans. Short-Trans. 71 71 69 61,000 59,000 58,000 9 4 3 Over 3 to 4, incl Longitudinal Long-Trans. Short-Trans. 69 69 67 59,000 57,000 56,000 8 3 2 Over 4 to 5, incl Longitudinal Long-Trans. Short-Trans. 67 67 66 56,000 56,000 55,000
29、 7 3 2 TABLE 5B - Minimum Tensile Properties, SI Units Nominal Thickness at Time of Heat Treatment Millimeters Specimen Orientation Tensile Strength MPa Yield Strength At 0.2% Offset MPA Elongation In 4D % 51 to 76, incl Longitudinal Long-Trans. Short-Trans. 490 490 476 421 407 400 9 4 3 Over 76 to
30、102, incl Longitudinal Long-Trans. Short-Trans. 476 476 462 407 393 386 8 3 2 Over 102 to 127, incl Longitudinal Long-Trans. Short-Trans. 462 462 455 386 386 379 7 3 2 SAE INTERNATIONAL AMS4320B Page 6 of 10 3.4.1.2 Stress-Corrosion Resistance: Specimens cut from forgings shall meet the electrical c
31、onductivity test of 3.4.1.2.1 and shall exhibit no evidence of stress-corrosion cracking when tested in accordance with 3.4.1.2.2. The test of 3.4.1.2.2 need not be performed on forgings meeting the requirements of 3.4.1.2.1.1 and 3.4.1.2.1.2. 3.4.1.2.1 Electrical Conductivity: Shall be as in 3.4.1.
32、2.1.2, determined on the surface of the sample in accordance with ASTM B 342. 3.4.1.2.1.1 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. 3.4.1.2.1.2 If the
33、conductivity is 38.0 to 39.9% IACS (22.0 to 23.1 MS/m), incl, if the longitudinal tensile properties meet specified requirements, and if the longitudinal yield strength does not exceed the specified minimum by more than 9.9 ksi (68 MPa), the forgings are acceptable. 3.4.1.2.1.3 If the conductivity i
34、s 38.0 to 39% IACS (22.0 to 23.1 MS/m), incl, and 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. If, after such treatment, the forgings meet the requirements of 3.4.1.2.1 and 3.4.1.2.
35、1.2 or 3.4.1.3.1.3, the forgings are acceptable. 3.4.1.2.1.4 If the conductivity is below 38.0% IACS (22.0 MS/m), the forgings are not acceptable but may be reheat treated as in 3.3 to meet the specified requirements. 3.4.1.2.2 Stress-Corrosion Cracking Resistance: Specimens cut from forgings 0.750
36、inch (19.05 mm) and over in nominal thickness shall show no evidence of stress-corrosion cracking in accordance with ASTM G 47 in the short-transverse direction to 75% of the specified minimum yield strength for the principal test direction (longitudinal for die forgings or long-transverse for hand
37、forgings). 3.4.1.3 Grain Flow: Shall be as specified on the drawing or as agreed upon by purchaser and vendor. 3.4.2 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 treated in the same manner as forgings, sp
38、ecimens taken from the heat treated coupon shall conform to the requirements of 3.4.1.1.1 and 3.4.1.2. If a test specimen taken from the stock after heat treatment in the same manner as forgings conforms to the requirements of 3.4.1.1.1 and 3.4.1.2, the test shall be accepted as equivalent to tests
39、of a forged coupon. 3.5 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. SAE INTERNATIONAL AMS4320B Page 7 of 10 3.5.1 Die forgings shall be subjected to a caust
40、ic etch followed by visual examination of the forging surfaces for conditions such as seams, laps, bursts, and quench cracks. Surface imperfections which can be removed so that they do not reappear on re-etching and the required section thickness can be maintained are acceptable. 3.5.2 When specifie
41、d, each forging shall be subjected to ultrasonic inspection in accordance with ASTM B 594 and shall meet the following requirements of that specification 3.5.2.1 Die forgings 0.500 to 4.000 inches (12.70 to 101.50 mm), incl, in section thickness and weighing not over 300 pounds (136 kg) shall meet C
42、lass B. 3.5.2.2 Hand forgings 1.000 to 5.000 inches (24.40 to 127.00 mm) in section thickness and weighing not more than 600 pounds (272 kg) shall meet Class A. 3.5.3 When specified, forgings shall be subjected to fluorescent penetrant inspection in accordance with ASTM E 1417. Acceptance criteria s
43、hall be as agreed upon by purchaser and vendor. 3.6 Tolerances: Forging stock shall conform to all applicable requirements of ANSI H 35.2 or ANSI H 35.2M. 4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of forgings shall supply all samples for vendors tests and shall b
44、e responsible for the performance of all required tests. Purchaser reserves the right to sample and 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 prop
45、erties (3.4.1.1), stress-corrosion resistance (3.4.1.2.2), surface visual examination (3.5.1), ultrasonic soundness (3.5.2), and fluorescent penetrant inspection (3.5.3) when specified, are acceptance tests and, except for composition, shall be performed on each lot. 4.2.2 Periodic Tests: Forging st
46、ock to demonstrate ability to develop required properties (3.4.2) and stress-corrosion resistance (3.4.1.2.2) 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 with A
47、MS 2355. SAE INTERNATIONAL AMS4320B Page 8 of 10 4.4 Reports: 4.4.1 The vendor of forgings shall furnish with each shipment a report stating that the product conforms to the composition, tolerances, and when specified, ultrasonic testing and fluorescent penetrant inspection. Numerical results of tes
48、ts on each inspection lot to determine conformance to the other acceptance test requirements and if performed, periodic tests shall be reported. This report shall include the purchase order number, inspection lot number(s), AMS 4320B, size and part number, and quantity. The report shall also identif
49、y the producer. 4.4.2 The vendor of forging stock shall furnish with each shipment a report stating that the product conforms to the composition requirements of this specification and other tests as may be required by the purchaser. This report shall identify the supplier, purchase order number, lot ingot or cast number, AMS 4320B, size and quantity. 4.5 Resampling and Retesting: Shall be in accor
