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/AMS4281G AEROSPACE MATERIAL SPECIFICATION AMS4281 REV. G Issued 1945-07 Revised 2
5、008-06 Reaffirmed 2014-05 Superseding AMS4281F Aluminum Alloy Castings, Permanent Mold 5.0Si - 1.2Cu - 0.50Mg (355.0-T6) Solution and Precipitation Heat Treated (Composition similar to UNS A03550) RATIONALE This document has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE 1.
6、1 Form This specification covers an aluminum alloy in the form of permanent mold castings. 1.2 Application These castings have been used typically for parts requiring moderate strength up to 300 F (149 C), but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the follow
7、ing 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 been cancelled and no superseding
8、document 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 724-776-4970 (outside USA), www.sae.org. AMS2175 Casting, Classif
9、ication and Inspection of AMS2360 Room Temperature Tensile Properties of Castings AMS2694 Repair Welding of Aerospace Castings AMS2771 Heat Treatment of Aluminum Alloy Castings AMS2804 Identification, Castings SAE INTERNATIONAL AMS4281G Page 2 of 7 2.2 ASTM Publications Available from ASTM Internati
10、onal, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B 557 Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products ASTM B 557M Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products (Metric) ASTM B 660 Pa
11、ckaging/Packing of Aluminum and Magnesium Products ASTM E 29 Using Significant Digits in Test Data to Determine Conformance with Specifications ASTM E 34 Chemical Analysis of Aluminum and Aluminum-Base Alloys ASTM E 227 Optical Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the P
12、oint-to-Plane Technique ASTM E 607 Optical Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the Point-to-Plane Technique, Nitrogen Atmosphere ASTM E 716 Sampling Aluminum and Aluminum Alloys for Spectrochemical Analysis ASTM E 1251 Optical Emission Spectrometric Analysis of Aluminu
13、m and Aluminum Alloys by the Argon Atmosphere, Point-to-Plane, Unipolar Self-Initiating Capacitor Discharge ASTM E 1417 Liquid Penetrant Examination ASTM E 1742 Radiographic Examination 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined
14、by wet chemical methods in accordance with ASTM E 34, by spectrochemical methods in accordance with ASTM E 227, ASTM E 607, or ASTM E 1251, or by other analytical methods acceptable to purchaser (See 3.4.1). TABLE 1 - COMPOSITION Element (3.1.1) min maxSilicon 4.5 5.5 Iron (3.1.2) - 0.6 Copper 1.0 1
15、.5 Manganese (3.1.2) - 0.50Magnesium 0.40 0.6 Chromium - 0.25Zinc - 0.35Titanium - 0.25Other Elements, each - 0.05Other Elements, total - 0.15Aluminum remainder 3.1.1 Test results may be rounded by the “rounding off“ method of ASTM E 29. 3.1.2 If iron content exceeds 0.45%, manganese content shall b
16、e not less than one-half the iron content. 3.2 Condition Solution and precipitation heat treated. 3.3 Castings Castings shall be produced from metal conforming to 3.1, determined by analysis of a specimen (3.4.1) cast after the last melt addition. SAE INTERNATIONAL AMS4281G Page 3 of 7 3.4 Cast Test
17、 Specimens Chemical analysis specimens and tensile specimens shall be cast as follows: 3.4.1 Chemical Analysis Specimens Shall be cast from each melt after the last melt addition and shall be tested to qualify the melt lot as in 3.1. Spectrochemical sample shall be prepared in accordance with ASTM E
18、 716. 3.4.2 Tensile Specimens 3.4.2.1 Unless specimens cut from a casting are specified by purchaser, separately-cast specimens conforming to ASTM B 557 or ASTM B 557M shall be cast from each melt after the last melt addition. Specimens shall be cast in permanent molds. Chills are not permitted on t
19、est specimen cavity except on the end face of the specimen when approved in accordance with 4.4.2. Tensile specimens shall be processed with each heat treat lot and tested for conformance to 3.6.1. 3.4.2.2 When purchaser specifies specimens cut from a casting or from integrally-cast coupons, such sp
20、ecimens shall be removed after heat treatment, shall conform to ASTM B 557 or ASTM B 557M, 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. 3.5 Heat Treatme
21、nt Shall be in accordance with AMS2771. Unless specimens cut from a casting are specified, one or more sets of separately-cast specimens shall, during each stage of heat treatment, be put into a batch-type furnace with each load of castings or into a continuous furnace at intervals of not longer tha
22、n three hours. 3.6 Properties Castings and separately-cast tensile specimens shall conform to the following requirements: 3.6.1 Tensile Properties Shall be as follows, determined in accordance with ASTM B 557 or ASTM B 557M; conformance to the requirements of 3.6.1.1 shall be used as the basis for a
23、cceptance of castings except when purchaser specifies that 3.6.1.2 applies: 3.6.1.1 Separately-Cast Specimens Specimens as in 4.3.2 shall have the properties shown in Table 2. TABLE 2 - MINIMUM TENSILE PROPERTIES FOR SEPARATELY-CAST SPECIMENS Property Value Tensile Strength 37.0 ksi (255 MPa)Yield S
24、trength at 0.2% Offset 23.0 ksi (159 MPa)Elongation in 4D 1.5% SAE INTERNATIONAL AMS4281G Page 4 of 7 3.6.1.2 Specimens Cut from Castings Specimens as in 4.3.4 shall have the properties shown in Table 3. TABLE 3 - MINIMUM TENSILE PROPERTIES FOR SPECIMENS CUT FROM CASTINGS Property Value Tensile Stre
25、ngth 27.0 ksi (191 MPa)Yield Strength at 0.2% Offset 17.0 ksi (117 MPa)Elongation in 4D 0.4% 3.6.1.2.1 When properties other than those of 3.6.1.2 are required, tensile specimens taken from locations indicated on the drawing, from a casting or castings chosen at random to represent the lot, shall ha
26、ve the properties indicated on the drawing for such specimens. Property requirements may be designated in accordance with AMS2360. 3.7 Quality Castings, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to u
27、sage of the castings. 3.7.1 When acceptance standards are not specified, Grade C of AMS2175 shall apply. 3.7.2 Methods of inspection and frequency of inspection shall be as agreed upon by purchaser and vendor. A “Casting Class“ of AMS2175 may be selected to specify the method and frequency of inspec
28、tion. 3.7.3 Castings shall be produced under radiographic control. This control shall consist of 100% radiographic inspection of castings until process control factors (See 4.4.2) have been established to ensure production of acceptable castings. Unless otherwise specified by purchaser, continued ra
29、diographic inspection of production castings shall be performed at a frequency determined by the vendor to ensure continued maintenance of internal quality. 3.7.4 Radiographic inspection shall be conducted in accordance with ASTM E 1742, unless otherwise specified by purchaser. 3.7.5 When specified
30、by purchaser, castings shall be fluorescent penetrant inspected using a method specified by purchaser, or, if not specified, a method in accordance with ASTM E 1417. 3.7.6 Castings shall not be peened, plugged, impregnated, or welded unless authorized by purchaser. 3.7.6.1 When authorized by purchas
31、er, welding in accordance with AMS2694 or other welding program approved by purchaser may 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 performance of all required tests. P
32、urchaser 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 Except as specified in 4.2.1.1, composition (3.1), tensile properties of separately-cast sp
33、ecimens (3.6.1.1), and quality (3.7) are acceptance tests and shall be performed to represent each melt or heat treat lot as applicable. SAE INTERNATIONAL AMS4281G Page 5 of 7 4.2.1.1 Tensile properties of specimens cut from castings shall be determined when specified by purchaser or when separately
34、-cast specimens are not available. Tensile properties of separately-cast specimens need not be determined when tensile properties of specimens cut from castings are determined. 4.2.2 Periodic Tests Radiographic inspection (3.7.3) following the establishment of process control (4.4.2) is a periodic t
35、est and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser. 4.2.3 Preproduction Tests All technical requirements are preproduction tests and shall be performed on the first-article shipment of a casting to a purchaser, when a change in mate
36、rial, and/or processing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing to be required. 4.3 Sampling and Testing Shall be in accordance with the following: 4.3.1 At least one chemical analysis specimen in accordance with 3.4.1 from each melt for conformance to 3.1. 4.3
37、.2 One or more separately-cast tensile specimens in accordance with 3.4.2 from each heat treat lot except when purchaser specifies specimens cut from a casting as in 4.3.4. 4.3.3 One or more preproduction castings in accordance with 4.4.1 of each part number. 4.3.4 One or more castings from each hea
38、t treat lot when properties of specimens cut from castings are required. For determining conformance to the requirements of 3.6.1.2, if specimen locations are not shown on the drawing, not less than four tensile specimens, two specimens from the thickest section and two specimens from the thinnest s
39、ection, shall be cut from a casting or castings from each heat treat lot. 4.4 Approval 4.4.1 Sample castings from new or reworked tooling (i.e. patterns, molds, dies, etc.) and the casting procedure shall be approved by purchaser before castings for production use are supplied, unless such approval
40、be waived by purchaser. 4.4.2 Vendor shall establish, for production of sample castings of each part number, parameters for the process control factors which will produce acceptable castings; these shall constitute the approved casting procedure and shall be used for producing production castings. V
41、endor shall also establish control factors for producing separately cast tensile specimens, but these control factors need not be identical to those used for production of castings. Method for production of separately-cast tensile specimens shall be consistent for all cast material. If necessary to
42、make any change in parameters for the process control factors, vendor shall submit for reapproval a statement of the proposed changes in processing and, when requested, test specimens, sample castings, or both. Production castings incorporating the revised operations shall not be shipped prior to re
43、ceipt of reapproval. SAE INTERNATIONAL AMS4281G Page 6 of 7 4.4.2.1 Control factors for producing tensile specimens and castings include, but are not limited to, the following. Suppliers procedures shall identify tolerances, ranges, and/or control limits, as applicable. Control factors for separatel
44、y-cast tensile specimens must generally represent, but need not be identical to, those factors used for castings: Type of furnace Furnace atmosphere Alloy additions, fluxing, deoxidation, and gas removal procedures Gating and risering practices Mold composition and molding practice Core composition
45、and fabrication method, when applicable Metal pouring temperature; variation of 50 F (28 C) from the established limit is permissible Solidification and cooling procedures Stabilization/precipitation heat treat cycle Straightening procedure, when applicable Cleaning operations Methods of inspection
46、Radiographic inspection sampling plan, if used. 4.4.2.1.1 Any of the above process control factors for which parameters are considered proprietary by the vendor may be assigned a code designation. Each variation in such parameters shall be assigned a modified code designation. 4.5 4.5 Reports The ve
47、ndor of castings shall furnish with each shipment a report showing the results of tests for composition of each melt and the results of tests for tensile properties of separately-cast specimens representing each heat treat lot or of specimens cut from a casting from each heat treat lot, and stating
48、that the castings conform to the other technical requirements. This report shall include the purchase order number, melt and heat treat lot numbers, AMS4281G, part number, and quantity. 4.6 Resampling and Retesting If any specimen used in the above tests fails to meet the specified requirements, dis
49、position of the castings may be based on the results of testing two additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the castings represented. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be in accordance with AMS2804. 5.2 Packaging Castings shall be prepared for shipment in
