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 2015 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/AMS4242C AEROSPACE MATERIAL SPECIFICATION AMS4242 REV. C Issued 1986-07 Reaffirme
5、d 2012-09 Revised 2015-09 Superseding AMS4242B Aluminum Alloy, Castings 4.7Cu - 0.60Ag - 0.35Mn - 0.25Mg - 0.25Ti (B201.0-T7) Solution Heat Treated and Overaged (Composition similar to UNS A02010) RATIONALE AMS4242C revises Heat Treatment (3.5) and is a Five Year Review and update of this specificat
6、ion. 1. SCOPE 1.1 Form This specification covers an aluminum alloy in the form of castings. 1.2 Application These castings have been used typically for aircraft components requiring high strength and reliability, both at room and elevated temperatures, but usage is not limited to such applications.
7、1.3 Alloy B201.0, the alloy designated in this specification, has restricted composition within the limits of alloy A201.0. 2. 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
8、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 been specified, the last published issue of that document shall apply. 2.1 SAE Publications Available from SAE Inter
9、national, 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. AMS2175 Casting, Classification and Inspection of AMS2360 Room Temperature Tensile Properties of Castings AMS2644 Inspection Material, Penetrant SAE I
10、NTERNATIONAL AMS4242C Page 2 of 10 AMS2694 In-Process Welding of Castings AMS2771 Heat Treatment of Aluminum Alloy Castings AMS2804 Identification Castings AS1990 Aluminum Alloy Tempers 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken,
11、PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B557 Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products ASTM B557M Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products (Metric) ASTM B660 Packaging/Packing of Aluminum and Magnesium Products ASTM E 29 Using
12、 Significant Digits in Test Data to Determine Conformance with Specifications ASTM E34 Chemical Analysis of Aluminum- and Aluminum-Base Alloys ASTM E101 Spectrographic Analysis of Aluminum and Aluminum Alloys by the Point-to-Plane Technique ASTM E155 Reference Radiographs for Inspection of Aluminum
13、and Magnesium Castings ASTM E227 Optical Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the Point-to-Plane Technique ASTM E607 Atomic Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the Point-to-Plane Technique, Nitrogen Atmosphere ASTM E716 Sampling Aluminum a
14、nd Aluminum Alloys for Spectrochemical Analysis ASTM E1251 Optical Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by Argon Atmosphere, Point-to-Plane, Unipolar Self-Initiating Capacitor Discharge ASTM E1417/E1417M Liquid Penetrant Examination ASTM E1742/E1742M Radiographic Examinati
15、on ASTM G44 Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5% Sodium Chloride Solution 2.3 U.S. Government Publications Copies of these documents are available online at http:/quicksearch.dla.mil. MIL-STD-1537 Electrical Conductivity Test for Measurement of Heat Treatment of Alumi
16、num Alloys, Eddy Current Method SAE INTERNATIONAL AMS4242C Page 3 of 10 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E34, by spectrochemical methods in accordance with ASTM E101, ASTM
17、 E227, ASTM E607, ASTM E1251, or by other analytical methods acceptable to purchaser (see 3.4.1). Table 1 Composition Element min max Silicon - 0.05 Iron - 0.05 Copper 4.5 5.0 Manganese 0.20 0.50 Magnesium 0.20 0.30 Titanium 0.15 0.35 Silver 0.40 0.8 Other Elements, each - 0.05 Other Elements, total
18、 - 0.15 Aluminum remainder 3.1.1 Test results may be rounded in accordance with the “rounding off“ method of ASTM E29. 3.2 Condition Solution heat treated and overaged to T7 temper (see AS1990). 3.3 Casting Castings shall be produced from metal conforming to 3.1, determined by analysis of a specimen
19、 (3.4.1) cast after the last melt addition. 3.4 Test Specimens 3.4.1 Chemical Analysis Specimen Shall be cast from each melt after the last melt addition and shall be tested to qualify the melt lot in accordance with 3.1. Spectrochemical sample shall be prepared in accordance with ASTM E716. 3.4.2 T
20、ensile Specimens Shall be cut from integrally-cast coupons. Each casting shall have two integrally-cast coupons to be removed after heat treatment, except as permitted in 3.4.2.1. One coupon shall remain with the casting in case reheat treatment and retesting are necessary. Specimens shall conform t
21、o ASTM B557 or ASTM B557M, and shall be either 0.500 inch (12.70 mm) diameter at the reduced parallel gage section, subsize specimens proportional to the standard, or standard sheet-type specimens, as required by 3.6.1. 3.4.2.1 Integrally-cast coupons may be removed prior to heat treatment only if d
22、ocumented procedures ensure that the coupons are marked with identification traceable to the casting and are heat treated with the corresponding casting. SAE INTERNATIONAL AMS4242C Page 4 of 10 3.5 Heat Treatment Shall be in accordance with AMS2771, except as follows: Castings and integrally-cast co
23、upons shall be solution heat treated and overaged in accordance with AMS2771, except as required by 3.5.1 and 3.5.2, to produce the properties specified in 3.6.1, 3.6.2, and 3.6.3 (see 8.2 and 8.4). For specific castings, in lieu of the changes introduced by AMS4242C, it is permissible to continue u
24、sing heat treating process parameters which were previously approved in accordance with 4.4. 3.5.1 Solution Heat Treatment Heat to 955 F 10 F (513 C 6 C) and soak for 2 hours 0.25 hour, raise temperature to 980 F 10 F (527 C 6 C) and soak for not less than 14 hours and quench. 3.5.2 Precipitation He
25、at Treatment to Overage Soak at 370 F 5 F (188 C 3 C) for 5 hours minimum and cool in air. 3.6 Properties Castings and integrally-cast coupons shall conform to the following requirements: 3.6.1 Tensile Properties Shall be as follows, determined in accordance with ASTM B557 or ASTM B557M: 3.6.1.1 Int
26、egrally-Cast Coupons Shall have the properties shown in Table 2. Table 2 - Minimum tensile properties Property Value Tensile Strength 62.0 ksi (427 MPa) Yield Strength at 0.2% Offset 55.0 ksi (379 MPa) Elongation in 4D 5% 3.6.1.2 Specimens Cut from Castings Tensile properties of specimens cut from a
27、 casting or castings shall be as shown in Tables 3 and 4. Table 3 - Minimum tensile properties for designated casting areas Property Value Tensile Strength 60.0 ksi (414 MPa) Yield Strength at 0.2% Offset 50.0 ksi (345 MPa) Elongation in 4D 3% Table 4 - Minimum tensile properties for casting areas o
28、ther than designated areas Property Value Tensile Strength 56.0 ksi (386 MPa) Yield Strength at 0.2% Offset 48.0 ksi (331 MPa) Elongation in 4D 2% SAE INTERNATIONAL AMS4242C Page 5 of 10 3.6.1.2.1 When properties other than those of Table 3 or Table 4 are required, tensile specimens taken from locat
29、ions indicated on the drawing, from a casting or castings chosen at random to represent the lot, shall have the properties indicated on the drawing for such specimens. Property requirements may be designated in accordance with AMS2360. 3.6.2 Electrical Conductivity Casting shall exhibit a minimum el
30、ectrical conductivity of 31% IACS International Annealed Copper Standard (18 MS/m), determined by the procedure of MIL-STD-1537. 3.6.3 Stress-Corrosion Resistance A specimen as in 4.3.2.1, cut from the designated area of the casting or from an integrally-cast coupon, shall show no evidence of stress
31、-corrosion cracking when tested for 30 days in accordance with ASTM G44 at a stress of 37.5 ksi (259 MPa) (see 8.3). 3.7 Quality 3.7.1 Castings, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of
32、the castings. 3.7.2 Radiographic inspection of each casting shall be performed in accordance with ASTM E1742/E1742M or other method specified by purchaser. ASTM E155 shall be used to define radiographic acceptance standards in accordance with Table 5. Table 5 - Radiographic acceptance criteria (1) (
33、2) (3) (4) Defect Indications Radiograph Reference Designated Areas Other Areas Gas holes 1.1 1 2 Gas porosity (round) 1.21 1 3 Gas porosity (elongated) 1.22 1 3 Shrinkage cavity 2.1 1 2 Shrinkage porosity or sponge 2.2 1 2 Foreign material (less dense) 3.11 1 2 Foreign material (more dense) 3.12 1
34、2 Segregation none none Cracks none none Cold shuts none none Laps none none NOTES: (1) Maximum permissible radiograph in accordance with ASTM E155. (2) When two or more types of defects are indicated to an extent equal to or not significantly better than the acceptance standards for respective defe
35、cts, the parts shall be rejected. (3) When two or more types of defects are indicated and the predominating defect is not significantly better than the acceptance standard, the part shall be considered borderline and shall be reviewed for disposition by the cognizant engineering personnel. (4) Discr
36、ete indications of 0.015 inch (0.38 mm) or larger in maximum dimension are not acceptable when closer than twice their maximum dimension to an edge or extremity of a casting in a designated area, or when closer than their maximum dimension to an edge or extremity in an undesignated area. 3.7.3 Each
37、casting shall be subjected to fluorescent penetrant inspection in accordance with ASTM E1417/E1417M. 3.7.3.1 The fluorescent penetrant shall have a sensitivity greater than or equal to Level 2 in accordance with AMS2644. 3.7.3.2 Unless otherwise specified by purchaser, the following acceptance crite
38、ria shall apply: SAE INTERNATIONAL AMS4242C Page 6 of 10 3.7.3.2.1 Linear indications, cold shuts, cracks, and seams are not acceptable. 3.7.3.2.2 Surface porosity is not acceptable if the individual pores are closer than twice their maximum dimension to an edge or extremity of the casting or the po
39、res form a linear indication; i.e., three or more are in a line and the distance between each indication is less than twice the maximum dimension of either adjacent indication. 3.7.3.2.3 Any individual indication which is five times longer than it is wide shall be considered a linear indication and
40、is not acceptable. 3.7.4 Castings shall not be peened, plugged, or welded, unless authorized by purchaser. 3.7.4.1 When authorized by purchaser, welding in accordance with AMS2694 or other welding program approved by purchaser may be used. 3.7.5 Castings shall not be impregnated, chemically treated,
41、 or coated to prevent leakage, unless specified or allowed by written permission of purchaser designating the method to be used. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of castings shall supply all samples for vendors tests and shall be responsible for the perfor
42、mance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the castings conform to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), tensile properties (3.6.1), electrical con
43、ductivity (3.6.2), and quality (3.7) are acceptance tests and shall be performed to represent each melt, or lot as applicable. 4.2.2 Periodic Tests Stress-corrosion resistance (3.6.3) is a periodic test and shall be performed at a frequency selected by the vendor unless frequency of testing is speci
44、fied by purchaser. 4.2.3 Preproduction Tests All technical requirements are preproduction tests and shall be performed prior to or on the first-article shipment of a casting to a purchaser, when a change in material and/or processing requires reapproval as in 4.4.2, and when purchaser deems confirma
45、tory testing to be required. 4.3 Sampling and Testing Shall be in accordance with the following: 4.3.1 For Acceptance Tests 4.3.1.1 One chemical analysis specimen in accordance with 3.4.1 from each melt for conformance to 3.1. 4.3.1.2 The destructive testing of castings for the evaluation of excised
46、 tensile specimen shall occur at the following frequency: 4.3.1.2.1 First 30 Castings Received One casting from each 10 production castings shall be selected for destructive testing in accordance with the requirements of 3.6.1.2. SAE INTERNATIONAL AMS4242C Page 7 of 10 4.3.1.2.2 Castings Received Th
47、ereafter If no failure occurs in 4.3.1.2.1, one casting from each 25 production castings consecutively received thereafter. If a failure occurs, the test frequency shall revert to one from each 10 production castings from the next 30 castings received. 4.3.1.3 An integrally-cast coupon from each cas
48、ting for tensile testing in accordance with 3.6.1.1. 4.3.1.4 Each casting for radiographic and fluorescent penetrant inspection in accordance with Section 3.7. 4.3.1.5 An integrally-cast coupon from each casting for electrical conductivity testing in accordance with 3.6.2. 4.3.2 For Periodic Tests a
49、nd Preproduction Tests As agreed upon by purchaser and vendor and the following: 4.3.2.1 Specimens for stress-corrosion tests shall be round specimens, not less than 0.250 inch (6.35 mm) in diameter in the reduced section. Whenever practicable, specimens shall be taken from the designated areas of the casting as shown on the engineering drawing. Specimens from integrally-cast coupons a
