SAE AMS 4179D-2016 Aluminum Alloy Forgings 5 6Zn - 2 5Mg - 1 6Cu - 0 23Cr (7175-T7452) Solution Heat Treated Stress Relieved and Precipitation Heat Treated (UNS A97175).pdf

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1、_ 6$(7HFKQLFDO6WDQGDUGV%RDUG5XOHVSURYLGHWKDW7KLVUHSRUWLVSX EOLVKHGE6$(WRDGYDQFHWKHVWDWHRIWHFKQLFDODQGHQJL 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, LVWKHVROHUHVSRQ

2、VLELOLWRIWKHXVHU 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 2016 SAE International All rights reserved. No part of this publication may be reproduced,

3、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) Fax: 724-776-0

4、790 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/AMS4179D AEROSPACE MATERIAL SPECIFICATION AMS4179 REV. D Issued 1974-06 Reaffirmed 2010-05 Revised 2016-09 Supe

5、rseding AMS4179C Aluminum Alloy Forgings 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (7175-T7452) Solution Heat Treated, Stress Relieved, and Precipitation Heat Treated (Composition similar to UNS A97175) RATIONALE AMS4179D revises Properties (3.3.1.2), Conductivity (3.3.1.3), Stress Corrosion (3.3.1.4) and Repo

6、rts (4.4.1.1), and is a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers an aluminum alloy in the form of die forgings not over 3 inches (76 mm) and hand forgings up to 6 inches (150 mm), inclusive in nominal thickness at the time of heat treatment, and

7、forging stock of any size (see 8.6). 1.2 Application These products have been used typically for parts requiring a high level of mechanical properties and good resistance to stress-corrosion cracking, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the following d

8、ocuments 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 docum

9、ent has been specified, the last published issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2355 Quality Assurance,

10、 Sampling and Testing Aluminum Alloys and Magnesium Alloy Wrought Products (Except Forging Stock), and Rolled, Forged, or Flash Welded Rings AMS2772 Heat Treatment of Aluminum Alloy Raw Materials SAE INTERNATIONAL AMS4179D Page 2 of 8 AMS2808 Identification Forgings ARP1917 Clarification of Terms Us

11、ed in Aerospace Metals Specifications 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, www.astm.org. ASTM B594 Ultrasonic Inspection of Aluminum Alloy Wrought Products for Aerospace Applications ASTM E

12、10 Brinell Hardness of Metallic Materials ASTM E1417/E1417M Liquid Penetrant Testing 2.3 ANSI Accredited Publications Copies of these documents are available online at http:/webstore.ansi.org/. ANSI H35.1/H35.1M Alloy and Temper Designation Systems for Aluminum ANSI H35.2 Dimensional Tolerances for

13、Aluminum Mill Products ANSI H35.2M Dimensional Tolerances for Aluminum Mill Products (Metric) 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined in accordance with AMS2355. Table 1 - Composition Element min max Silicon - 0.15 Iron - 0.20

14、 Copper 1.2 2.0 Manganese - 0.10 Magnesium 2.1 2.9 Chromium 0.18 0.28 Zinc 5.1 6.1 Titanium - 0.10 Other Elements, each - 0.05 Other Elements, total - 0.15 Aluminum remainder SAE INTERNATIONAL AMS4179D Page 3 of 8 3.2 Condition The product shall be supplied in the following condition: 3.2.1 Forgings

15、 Solution heat treated, stress relieved by compression to produce a permanent set of 1 to 5%, and precipitation heat treated (see 8.2). Heat treatment shall be performed using pyrometry in accordance with AMS2772. 3.2.2 Forging Stock Forging stock used to produce forgings to this specification shall

16、 be ingot or wrought stock in the O or F temper (see ANSI H35.1/H35.1M). Forge stock ordered to this specification is for manufacturing forgings defined in 3.2.1. Material shall comply with the requirements of Table 1. 3.3 Properties The product shall conform to the following requirements determined

17、 in accordance with AMS2355 on the mill produced size. 3.3.1 Die and Hand Forgings 3.3.1.1 Tensile Properties Shall be as follows: 3.3.1.1.1 Die Forgings 3.3.1.1.1.1 Longitudinal (With Grain Flow) Specimens, machined from forgings not over 3 inches (76 mm) in nominal thickness at time of heat treatm

18、ent with axis of specimen in the area of gage length varying not more than 15 degrees from parallel to the forging flow lines, shall have the properties shown in Table 2. Table 2 - Minimum tensile properties Property Value Tensile Strength 73.0 ksi (503 MPa) Yield Strength at 0.2% Offset 63.0 ksi (4

19、34 MPa) Elongation in 4D 7% in 5D 6% 3.3.1.1.1.2 Transverse (Across Grain Flow) Specimens, machined from forgings not over 3 inches (76 mm) in nominal section thickness at time of heat treatment with axis of specimens in the area of the gage length varying not more than 15 degrees from perpendicular

20、 to the forging flow lines, shall have the properties shown in Table 3. Table 3 - Minimum tensile properties Property Value Tensile Strength 68.0 ksi (469 MPa) Yield Strength at 0.2% Offset 55.0 ksi (379 MPa) Elongation in 4D 4% in 5D 3% SAE INTERNATIONAL AMS4179D Page 4 of 8 3.3.1.1.1.2.1 Elongatio

21、n requirement applies only to specimens having a gage length diameter not less than 0.250 inch (6.35 mm) and cut so that the length of the specimen is in a plane parallel to the parting plane. 3.3.1.1.2 Hand Forgings Specimens, machined from forgings not over 6 inches (152 mm) in nominal as-forged t

22、hickness and having an essentially rectangular or square cross-section not exceeding 156 in2 (1007 cm2) in area and heat treated in the indicated thickness, shall have the properties specified in Table 4. Table 4A - Minimum tensile properties, inch/pound units Nominal Thickness At Time of Heat Treat

23、ment Inches Specimen Orientation Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 4D % Up to 2, incl Longitudinal 71.0 61.0 9 Long.-Trans. 69.0 58.0 5 Over 2 to 3, incl Longitudinal 71.0 61.0 9 Long.-Trans. 69.0 58.0 5 Short-Trans. 67.0 54.0 4 Over 3 to 4, incl Longitudinal 68.0

24、57.0 9 Long.-Trans. 67.0 55.0 5 Short-Trans. 65.0 51.0 4 Over 4 to 5, incl Longitudinal 65.0 54.0 8 Long.-Trans. 64.0 52.0 5 Short-Trans. 63.0 49.0 4 Over 5 to 6, incl Longitudinal 63.0 51.0 8 Long.-Trans. 61.0 49.0 5 Short-Trans. 60.0 46.0 4 Table 4B - Minimum tensile properties, SI units Nominal T

25、hickness At Time of Heat Treatment Millimeters Specimen Orientation Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 4D % Up to 50, incl Longitudinal 490 420 9 Long.-Trans. 476 400 5 Over 50 to 75, incl Longitudinal 490 420 9 Long.-Trans. 476 400 5 Short-Trans. 462 372 4 Over 75

26、to 100, incl Longitudinal 469 393 9 Long.-Trans. 462 379 5 Short-Trans. 448 352 4 Over 100 to 125, incl Longitudinal 448 372 8 Long.-Trans. 441 359 5 Short-Trans. 434 338 4 Over 125 to 150, incl Longitudinal 434 351 8 Long.-Trans. 420 338 5 Short-Trans. 414 317 4 SAE INTERNATIONAL AMS4179D Page 5 of

27、 8 3.3.1.2 Mechanical property requirements for product outside the range listed in 1.1 shall be agreed upon between purchaser and producer. 3.3.1.3 Conductivity Shall be as follows, determined on the surface of the tensile sample: 3.3.1.3.1 If the conductivity is 40.0% IACS (International Annealed

28、Copper Standard) (23.2 MS/m), or higher and tensile properties meet specified requirements, the forgings are acceptable. 3.3.1.3.2 If the conductivity is 38.0 to 39.9% IACS (22.0 to 23.1 MS/m), if the tensile properties meet specified properties, and if the longitudinal yield strength does not excee

29、d the specified minimum by more than 11.9 ksi (82 MPa), the forgings are acceptable. 3.3.1.3.3 If the conductivity is below 40.0% IACS (23.2 MS/m) and longitudinal yield strength exceeds the specified minimum value by more than 11.9 ksi (82 MPa), the forgings are not acceptable. 3.3.1.3.4 If the con

30、ductivity is below 38.0% (22.0MS/m), forgings are not acceptable and shall be reprocessed regardless of tensile properties. 3.3.1.3.5 Forgings that are not acceptable, according to the requirements of 3.3.1.3.3 or 3.3.1.3.4, may be given additional precipitation heat treatment or may be resolution h

31、eat treated and reprecipitation heat treated, and retested. After such treatment, if all specified properties are met, the forging is acceptable. 3.3.1.4 Stress-Corrosion Resistance Specimens cut from forgings 0.750 inch (19.05 mm) and over in nominal thickness, shall show no evidence of stress-corr

32、osion cracking when stressed in the short-transverse direction (perpendicular to grain flow) at 35.0 ksi (241 MPa) for die and hand forgings 3 inches (76 mm) and under in section thickness or to 50% of the specified minimum longitudinal (with grain flow) yield strength for hand forgings over 3 inche

33、s (76 mm) in section thickness and held at constant strain. 3.3.1.5 Grain Flow Grain flow of die forgings, except in areas which contain end grain, shall follow the general contour of the forging, showing no evidence of re-entrant flow. 3.3.2 Forging Stock When a sample of stock is forged to a test

34、coupon having a degree of mechanical working not greater than the forging and heat treated in the same manner as forgings, specimens taken from the heat treated coupon shall conform to the requirements of 3.3.1.1 and 3.3.1.2. If specimens taken from the stock after heat treatment in the same manner

35、as forgings conform to the requirements of 3.3.1.1 and 3.3.1.2, the tests shall be accepted as equivalent 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 detriment

36、al to usage of the product. 3.4.1 Each hand forging, and when specified, each die forging, shall be subjected to ultrasonic inspection in accordance with ASTM B594 and shall meet the following acceptance criteria: 3.4.1.1 Hand Forgings Class A. 3.4.1.2 Die Forgings Class B. SAE INTERNATIONAL AMS4179

37、D Page 6 of 8 3.4.2 Each forging shall be free from surface defects, such as seams, laps, bursts, and quench cracks, when etched by swabbing or immersing in an aqueous solution of sodium hydroxide, thoroughly rinsing in tap water, followed by washing in nitric acid or chromic-sulfuric acid solution

38、or equivalent solution which will produce a surface suitable for visual inspection. Surfaces shall be evaluated for defects and, if defects can be removed so that they do not reappear on re-etching and if the required section thickness is maintained, the forgings are acceptable. Forgings shall be th

39、oroughly dried after each etch and rinse operation to prevent fluid entrapment. 3.4.2.1 When approved by purchaser, a sampling plan may be used in lieu of etching each forging. 3.4.3 When specified, each die forging shall be subjected to fluorescent penetrant inspection in accordance with ASTM E1417

40、/E1417M. Forgings shall be free from surface defects such as seams, laps, bursts, and quench cracks. 3.4.4 Forge stock shall be uniform in quality and condition, sound and free of foreign materials and from imperfections detrimental to use as starting stock for product produced to this specification

41、. 3.5 Tolerances Forging stock shall conform to all applicable requirements of ANSI H35.2 or ANSI H35.2M. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection 7KHSURGXFHURIWKHSURGXFWVKDOOVXSSODOOVDPSOHVIRUSURGXFHUVWHVWVDQGVKDOOEH UHVSRQVLEOHIRUWKHSHUIRUPDQFHRIDOO required tests. Purchas

42、er reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to the specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), tensile properties (3.3.1.1 and 3.3.1.2), electrical conductivity (3.3.1.3

43、), ultrasonic inspection (3.4.1), surface evaluation (3.4.2), when specified, fluorescent penetrant examination (3.4.3) and tolerances are acceptance tests and, except for composition, shall be performed on each lot. 4.2.2 Periodic Tests Stress corrosion resistance (3.3.1.4), grain flow of die forgi

44、ngs (3.3.1.5), and ability of forging stock to develop required properties are periodic tests and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be in accordance with AMS2355 and the following: a lot sh

45、all be all forgings of the same nominal cross-section and configuration, heat treated in the same batch furnace load or in a continuous furnace consecutively during an 8-hour period. Maximum lot size for forgings heat treated in a continuous furnace and charged consecutively during continuous furnac

46、e operation shall be 2000 pounds (907 kg) for forgings weighing 5 pounds (2.6 kg) and under and shall be 6000 pounds (2721 kg) for forgings weighing over 5 pounds (2.6 kg). 4.4 Reports 4.4.1 The producer of the product shall furnish with each shipment a report stating that the product conforms to th

47、e composition and tolerances, results of nondestructive inspection, and showing the numerical results of tests on each lot to determine conformance to the acceptance test requirements and when performed, the periodic test requirements. This report shall include the purchase order number, lot number(

48、s), AMS4179D, sizes and quantity. The report shall also include the identity of the producer and the size of the mill product. 4.4.1.1 When the product size is outside the range listed in 1.1, the report shall contain a statement to that effect. SAE INTERNATIONAL AMS4179D Page 7 of 8 4.4.2 The producer of forging stock shall furnish with each shipment a report stating the