1、Aluminum Alloy, Die and Hand Forgings5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (7175-T74)Solution and Precipitation Heat Treated(Composition similar to UNS A97175)RATIONALEThis document has been reaffirmed to comply with the SAE 5-year Review policy.1. SCOPE:1.1 Form: This specification covers an aluminum allo
2、y in the form of die and hand forgings.1.2 Application: These products 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. APPLICABLE DOCUMENTS: The issue of the following documents
3、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 been cancelled and no superseding document has b
4、een specified, the last published issue of that document shall apply.AEROSPACE MATERIAL SPECIFICATIONAMS 4149DIssuedRevisedReaffirmedSuperseding AMS 4149C1971-052002-092010-05SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engi
5、neering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may
6、 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 be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopyin
7、g, 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) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedba
8、ck on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS4149D Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 4149D SAE AMS 4149D- 2 -2.1 SAE Publications: Available fr
9、om SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or 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 RingsMAM 2355 Quality Assurance Sampling and Testing, Aluminum Al
10、loys and Magnesium Alloys, Wrought Products, Except Forging Stock, and Rolled, Forged or Flash Welded Rings, Metric (SI) UnitsAMS 2772 Heat Treatment of Aluminum Alloy Raw MaterialsAMS 2808 Identification, ForgingsAS1990 Aluminum Alloy Tempers2.2 ASTM Publications: Available from ASTM, 100 Barr Harb
11、or Drive, West Conshohocken, PA 19428-2959 or www.astm.org.ASTM B 594 Ultrasonic Inspection of Aluminum-Alloy Wrought Products for Aerospace ApplicationsASTM E 1417 Liquid Penetrant ExaminationASTM B 660 Packaging/Packing of Aluminum and Magnesium Products2.3 ANSI Publications: Available from ANSI,
12、25 West 43rd Street, New York, NY 10036-7406.ANSI H35.2 Dimensional Tolerances for Aluminum Mill ProductsANSI H35.2M Dimensional Tolerances for Aluminum Mill Products (Metric)Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted witho
13、ut license from IHS-,-,-AMS 4149D SAE AMS 4149D- 3 -3. TECHNICAL REQUIREMENTS: 3.1 Composition: Shall conform to the percentages by weight shown in Table 1, determined in accordance with AMS 2355 or MAM 2355.3.2 Condition: 3.2.1 Solution and precipitation heat treated to the T74 temper in accordance
14、 with AMS 2772.3.2.2 Forge stock used to produce forgings to this specification shall be ingot or wrought stock in -O or -F temper (see AS 1990). Forge stock ordered to this specification is for processing to the requirements of paragraph 3.2.TABLE 1 - CompositionElement min maxZinc 5.1 6.1Magnesium
15、 2.1 2.9Copper 1.2 2.0Chromium 0.18 0.28Iron - 0.20Silicon - 0.15Manganese - 0.10Titanium - 0.10Other Impurities, each - 0.05Other Impurities, total - 0.15Aluminum remainderCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without
16、 license from IHS-,-,-AMS 4149D SAE AMS 4149D- 4 -3.3 Properties: Forgings shall conform to the following requirements, determined in accordance with AMS 2355 or MAM 2355 on the mill produced size:3.3.1 Tensile Properties: Shall be as follows:3.3.1.1 Die Forgings: 3.3.1.1.1 Longitudinal (With Grain
17、Flow): Specimens, machined from forgings 6 inches (152 mm) and under in nominal thickness at time of heat treatment or from prolongations on such forgings, with axis of specimen in area of the gage length varying not more than 15 degrees from parallel to forging flow lines, shall have the properties
18、 shown in Table 2.TABLE 2A - Minimum Tensile Properties, Inch/Pound UnitsNominal ThicknessAt Timeof Heat TreatmentInchesTensileStrengthksiYield Strengthat 0.2% OffsetksiElongation in2 Inches or 4D%Up to 3, incl 76.0 66.0 7Over 3 to 4, incl 73.0 63.0 7Over 4 to 5, incl 70.0 61.0 7Over 5 to 6, incl 68
19、.0 58.0 7TABLE 2B - Minimum Tensile Properties, SI UnitsNominal ThicknessAt Timeof Heat TreatmentMillimetersTensileStrengthMPaYield Strengthat 0.2% OffsetMPaElongation in50.8 mm or 4D%Up to 76, incl 524 455 7Over 76 to 102, incl 503 434 7Over 102 to 127, incl 483 420 7Over 127 to 152, incl 469 400 7
20、Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 4149D SAE AMS 4149D- 5 -3.3.1.1.2 Across Grain Flow: Specimens, machined from forgings 6 inches (152 mm) and under in nominal thickness at time of
21、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. If configuration of the forging or prolongation cannot accommodate transverse spe
22、cimen described, acceptance of the forging shall be based on testing as in 3.3.1.1.3.3.3.1.1.2.1 Elongation requirements shall not apply to specimens having a gage length diameter less than 0.250 inch (6.35 mm), located in immediate proximity to an abrupt change in section thickness, or located so t
23、hat any part of the specimen gage length is located within 1/8 inch (3.2 mm) of the trimmed flash line.3.3.1.1.3 At Angle to Grain Flow: Specimens, machined from forgings 6 inches (152 mm) and under in nominal thickness at time of heat treatment or from prolongations on such forgings, with axis of s
24、pecimen in area of gage length varying more than 15 degrees from parallel and also more than 15 degrees from perpendicular to forging flow line, shall have the properties shown in Table 4. Such test results shall be identified as neither longitudinal nor transverse tensile test results.TABLE 3A - Mi
25、nimum Tensile Properties, Inch/Pound UnitsNominal ThicknessAt Timeof Heat TreatmentInchesTensileStrengthksiYield Strengthat 0.2% OffsetksiElongation in2 Inches or 4D%Up to 3, incl 71.0 62.0 4Over 3 to 4, incl 70.0 60.0 4Over 4 to 5, incl 68.0 58.0 4Over 5 to 6, incl 65.0 55.0 4TABLE 3B - Minimum Ten
26、sile Properties, SI UnitsNominal ThicknessAt Timeof Heat TreatmentMillimetersTensileStrengthMPaYield Strengthat 0.2% OffsetMPaElongation in50.8 mm or 4D%Up to 76, incl 490 427 4Over 76 to 102, incl 483 414 4Over 102 to 127, incl 469 400 4Over 127 to 152, incl 448 379 4Copyright SAE International Pro
27、vided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 4149D SAE AMS 4149D- 6 -3.3.1.2 Hand Forgings: Specimens, machined from forgings having an essentially square or rectangular cross section, shall have the properties shown in Tab
28、le 4 provided that as-forged section thickness does not exceed 6 inches (150 mm).TABLE 4A - Minimum Tensile Properties, Inch/Pound UnitsNominal Thicknessat Timeof Heat TreatmentInchesSpecimenOrientationTensileStrengthksiYield Strengthat 0.2% OffsetksiElongation in2 Inches or 4D%Up to 2, incl Longitu
29、dinalLong Trans.73.071.063.060.095Over 2 to 3, incl LongitudinalLong Trans.Short Trans.73.071.069.063.060.060.0954Over 3 to 4, incl LongitudinalLong Trans.Short Trans.71.070.068.061.058.057.0954Over 4 to 5, incl LongitudinalLong Trans.Short Trans.68.067.066.057.056.055.0854Over 5 to 6, incl Longitud
30、inalLong Trans.Short Trans.65.064.063.054.052.052.0854TABLE 4B - Minimum Tensile Properties, SI UnitsNominal Thicknessat Timeof Heat TreatmentMillimetersSpecimenOrientationTensileStrengthMPaYield Strengthat 0.2% OffsetMPaElongation in50.8 mm or 4D%Up to 51, incl LongitudinalLong Trans.50349043441495
31、Over 51 to 76, incl LongitudinalLong Trans.Short Trans.503490476434414414954Over 76 to 102, incl LongitudinalLong Trans.Short Trans.490483469421400393954Over 102 to 127, incl LongitudinalLong Trans.Short Trans.469462455393386379854Over 127 to 152, incl LongitudinalLong Trans.Short Trans.448441434372
32、359359854Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 4149D SAE AMS 4149D- 7 -3.3.2 Stress-Corrosion Resistance: If electrical conductivity 3.3.2.1 and tensile properties (3.3.1) meet specifie
33、d requirements, forgings have acceptable stress-corrosion cracking resistance.3.3.2.1 Conductivity: Shall be as follows, determined on the surface of the test specimen or sample:3.3.2.1.1 If conductivity is 40.0% IACS (International Annealed Copper Standard) (23.2 MS/m) or higher and tensile propert
34、ies meet specified requirements, forgings are acceptable.3.3.2.1.2 If conductivity is 38.0 to 39.9 IACS (22.0 to 23.1 MS/m), inclusive, if tensile properties meet specified requirements, and if yield strength does not exceed the specified minimum by more than 11.9 ksi (82 MPa), forgings are acceptab
35、le.3.3.2.1.3 If conductivity is below 40.0 IACS (23.2 MS/m) and yield strength exceeds the specified minimum value by more than 11.9 ksi (82 MPa), forgings shall be given additional precipitation heat treatment and retested to determine conformance to 3.3.1 and 3.3.2.1.3.3.2.1.4 If conductivity is b
36、elow 38.0% IACS (22.0 MS/m), forgings are not acceptable and shall be reprocessed regardless of property level.3.3.2.2 Stress-Corrosion Cracking Resistance: Specimens, cut from forgings 0.750 inch (19.05 mm) and over in nominal thickness, shall show no evidence of stress-corrosion cracking when stre
37、ssed in the short-transverse direction (perpendicular 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 specified minimum longitudinal (with grain flow) yield strength for forgings over 3 inches (76 mm) in nominal thickness.3.3.3 Frac
38、ture-Toughness: When specified, die forgings having nominal thickness of 1.50 to 6.00 inches (38.1 to 152.4 mm), inclusive, and hand forgings 2.60 to 6.00 inches (66.0 to 152.4 mm) in nominal thickness shall meet the values of KIcshown in Table 5. The required test directions shall be specified by p
39、urchaser. 3.3.4 Grain Flow: Grain flow of die forgings, except in areas which contain flash-line end grain, shall follow the general contour of the forgings showing no evidence of re-entrant grain flow.TABLE 5 - Minimum Fracture Toughness (KIc)Test DirectionKIcKIcDie ForgingsL-TT-LS-L27.021.021.029.
40、723.123.1Hand ForgingsL-TT-LS-L30.025.021.033.027.523.1inksimMPaCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 4149D SAE AMS 4149D- 8 -3.4 Quality: Forgings, as received by purchaser, shall be u
41、niform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the forgings.3.4.1 Forge stock shall be uniform in quality and condition, sound and free of foreign materials and from imperfections detrimental to usage as starting stock for produ
42、ct produced to this specification.3.4.2 When specified, die forgings shall be etched to produce a surface suitable for visual examination of the forging surfaces for defect indications, such as seams, laps, bursts, and quench cracks. Surface imperfections which can be removed, which do not reappear
43、on re-etching, and do not reduce required section thickness are acceptable.3.4.3 When specified, forgings shall be subjected to ultrasonic inspection in accordance with ASTM B 594 and shall meet the following requirements of that specification: 3.4.3.1 Die forgings 0.500 to 4.000 inches (12.70 to 10
44、1.60 mm), inclusive, in nominal thickness and weighing not over 300 pounds (136 kg) shall meet Class A.3.4.3.2 Hand forgings 1.000 to 6.000 inches (25.40 to 152.40 mm), inclusive, in nominal thickness and weighing not more than 600 pounds (272 kg) shall meet Class A.3.4.4 When specified, forgings sh
45、all be subjected to fluorescent penetrant inspection in accordance with ASTM E 1417. Standards for acceptance shall be as agreed upon by purchaser and vendor.3.5 Tolerances: Forging stock shall conform to all applicable requirements of ANSI H35.2 and H35.2M.4. QUALITY ASSURANCE PROVISIONS: 4.1 Respo
46、nsibility 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 testing deemed necessary to ensure that the forgings conform to speci
47、fied requirements.4.2 Classification of Tests: 4.2.1 Acceptance Tests: Composition (3.1), tensile properties (3.3.1), stress-corrosion resistance (3.3.2), tolerances (3.5), and, when specified, surface visual examination (3.4.2), fracture-toughness (3.3.3), ultrasonic inspection (3.4.3), and fluores
48、cent penetrant inspection (3.4.4) are acceptance tests and, except for composition, shall be performed on each inspection lot.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 4149D SAE AMS 4149D-
49、9 -4.2.2 Periodic Tests: Stress-corrosion resistance (3.3.2) and grain flow (3.3.5) 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 AMS 2355 or MAM 2355.4.4 Reports: 4.4.1 The vendor of the product s
