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 2016 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/AMS4288 AEROSPACE MATERIAL SPECIFICATION AMS4288 Issued 2001-11 Reaffirmed 2016-0
5、5 Aluminum Alloy Castings 7.0Si - 0.58Mg - 0.15Ti (E357.0-T6) Solution and Precipitation Heat Treated RATIONALE AMS4288 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE:1.1 Form: This specification covers an aluminum alloy in the form of castings.1.2 Application: These ca
6、stings have been used typically for structural aircraft components, but usage is not limited to such applications.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 supplier
7、may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been canceled and no superseding document has been specified, the last published issue of that document shall apply.2.1 SAE Publications: Available from SAE, 400 Commonweal
8、th Drive, Warrendale, PA 15096-0001 or www.sae.org.AMS 2360 Room Temperature Tensile Properties of CastingsAMS 2694 Repair Welding of Aerospace CastingsAMS 2771 Heat Treatment of Aluminum Alloy Castings2.2 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-295
9、9 or www.astm.org.ASTM B 557 Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy ProductsASTM B 557M Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products (Metric)ASTM E 29 Using Significant Digits in Test Data to Determine Conformance with SpecificationsASTM E 34 Chemic
10、al Analysis of Aluminum and Aluminum AlloysASTM E 155 Reference Radiographs for Inspection of Aluminum and Magnesium CastingsASTM E 227 Optical Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the Point-to-Plane TechniqueASTM E 607 Optical Emission Spectrometric Analysis of Aluminu
11、m and Aluminum Alloys by the Point-to-Plane Technique, Nitrogen AtmosphereASTM E 716 Sampling Aluminum and Aluminum Alloys for Spectrochemical AnalysisASTM E 1251 Optical Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the Argon Atmosphere, Point-to-Plane, Unipolar Self-Initiating
12、 Capacitor DischargeASTM E 1417 Liquid Penetrant ExaminationASTM E 1742 Radiographic Examination2.3 Aluminum Association Publications: Available from the Aluminum Association, Inc., 900 19th Street, N.W., Washington, DC 20006 or www.aluminum.org.AA-CS-E18 Cast Surface Smoothness3. TECHNICAL REQUIREM
13、ENTS: 3.1 Composition: Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 34, by spectrochemical methods in accordance with ASTM E 227, ASTM E 607, ASTM E 1251, or by other analytical methods acceptable to purchaser (See 3.4.1).A
14、MS 2804 Identification, CastingsAMS 4246 Aluminum Alloy Welding Wire, 7.0Si - 0.52MgAMS-STD-2175 Classification and Inspection of CastingsARP1947 Dendrite Arm Spacing of Structural Aircraft Quality D357 Aluminum Alloy Castings, Determination and Acceptance of2.1 (Continued):SAE INTERNATIONAL AMS4288
15、 Page 2 of 12_ 3.1.1 Test results may be rounded by the “rounding off” method of ASTM E 29.3.2 Condition: Solution and precipitation heat treated to T6 condition.3.3 Casting: 3.3.1 Castings shall be produced from metal conforming to 3.1, determined by analysis of a specimen (3.4.1) cast after the la
16、st melt addition.3.3.2 Microstructure: Castings shall be produced using control of the solidification rate, as required to ensure specified properties. Validation shall be performed by measurement of dendrite arm spacing (DAS) in accordance with ARP1947 or by other method acceptable to purchaser.3.4
17、 Test Specimens: 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 as in 3.1. The method for control of any subsequent additions prior to pouring (i.e., grain refining, correction for magnesium fade, etc.) shall be do
18、cumented as a control factor (See 4.4.2). Spectrochemical sample shall be prepared in accordance with ASTM E 716.3.4.2 Specimens Cut from Castings: Shall conform to ASTM B 557 or ASTM B 557M and shall be tested for tensile property determination as specified in 3.6.1.1. Location(s) and size of cut s
19、pecimens shall be as agreed upon by purchaser and vendor.3.4.3 Integrally Cast Coupons: Shall be integrally attached to castings and tested for tensile property determination as specified in 3.6.1.2. Unless otherwise specified by purchaser, the following shall apply:TABLE 1 - CompositionElement min
20、maxSilicon 6.5 7.5Iron - 0.10Manganese - 0.10Magnesium (See 8.3) 0.55 0.6Titanium 0.10 0.20Beryllium - 0.002Other Elements, each (See 8.4) - 0.05Other Elements, total - 0.15Aluminum remainderSAE INTERNATIONAL AMS4288 Page 3 of 12_ 3.4.3.1 One or more coupons shall be integrally cast with each castin
21、g and represent the thickest section of the highest strength designated area of the casting. Location(s) shall be as agreed upon by purchaser and vendor. Additional coupons may be added for retesting and for foundry purposes at the option of the foundry.3.4.3.2 Coupons shall be flat and at least lar
22、ge enough to permit excision of sub-size round tensile specimens of 0.250 inch (6.35 mm) diameter conforming to ASTM B 557 or ASTM B 557M with a gage length of 1 inch (25.4 mm). When agreed upon by purchaser and vendor, specimens may be of rectangular configuration or cast to size.3.4.3.3 Coupons sh
23、all remain attached to the casting until completion of heat treatment. When agreed upon by purchaser and vendor (e.g., to accommodate straightening, tooling fixtures, or other processing), coupons may be removed at an earlier operation, identified for traceability, and processed with the castings th
24、rough all subsequent operations.3.5 Heat Treatment: Shall be in accordance with AMS 2771. 3.6 Properties: 3.6.1 Tensile Properties: Castings and representative tensile specimens shall conform to the following requirements, determined in accordance with ASTM B 557 or ASTM B 557M:3.6.1.1 Specimens Cut
25、 From Castings: Unless otherwise specified, specimens as in 4.3.1.2 shall have the properties shown in Table 2 and 3, as applicable.TABLE 2 - Tensile Properties for Designated Areas of Castingand Integrally Cast CouponsProperty Minimum ValueTensile Strength 50.0 ksi (345 MPa)Yield Strength at 0.2% O
26、ffset 40.0 ksi (276 MPa)Elongation in 4D 3%TABLE 3 - Tensile Properties for Casting Areas Other Than Designated AreasProperty Minimum ValueTensile Strength 45.0 ksi (310 MPa)Yield Strength at 0.2% Offset 36.0 ksi (248 MPa)Elongation in 4D 2%SAE INTERNATIONAL AMS4288 Page 4 of 12_ 3.6.1.2 Specimens C
27、ut from Integrally Cast Coupons: Unless otherwise specified, specimens as in 4.3.1.3 shall have the properties shown in Table 2.3.6.1.3 When properties other than those of Tables 2 or 3 are required, tensile specimens taken from locations indicated on the drawing, or from a casting or castings chose
28、n at random to represent the heat treat lot, shall have the properties indicated on the drawing for such specimens. Property requirements may be designated in accordance with AMS 2360.3.6.2 Section Audit: When specified by purchaser, regions designated radiographic Grades A and B shall be cut into s
29、ingle wall sections. Radiographic examination shall be performed in accordance with 3.7.3 on the resulting sections. Penetrant examination in accordance with 3.7.4 shall be performed on any blind as-cast surfaces. Sectioned thickness shall be typically 0.75 inch (20 mm), or as agreed to between purc
30、haser and vendor.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 usage of the castings.3.7.1 Castings shall have a surface finish in accordance with the engineering drawing. The A
31、luminum Association AA-CS-E18 may be used to specify surface finish acceptance criteria.3.7.2 Methods of inspection and frequency of inspection shall be as agreed upon by purchaser and vendor. A “Casting Class” of AMS-STD-2175 may be selected to specify the methods and frequency of inspection. A “Ca
32、sting Grade” per AMS-STD-2175 may be selected to specify the acceptance criteria.3.7.3 Radiographic Inspection: 3.7.3.1 Castings shall be produced under radiographic control. This control shall consist of 100% radiographic inspection of castings until process control factors (4.4.2) have been establ
33、ished to ensure production of acceptable castings. 3.7.3.2 Radiographic inspection shall be conducted in accordance with ASTM E 1742, unless otherwise specified by purchaser.3.7.3.3 When radiographic acceptance standards are not otherwise specified, the requirements of Table 4 shall apply:SAE INTERN
34、ATIONAL AMS4288 Page 5 of 12_ 3.7.4 Penetrant Inspection: 3.7.4.1 Penetrant inspection shall be performed on each casting in accordance with ASTM E 1417, Type 1, Level 2, unless otherwise specified by purchaser.3.7.4.2 When penetrant acceptance standards are not otherwise specified, the following ap
35、ply:3.7.4.2.1 Linear discontinuities, cold shuts, cracks, and seams are not acceptable.3.7.4.2.2 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 pores form a linear discontinuity (e.g., three or mo
36、re are in a line and the distance between any two discontinuities is less than twice the maximum dimension of either adjacent discontinuity).3.7.4.2.3 Linear indications (edges not rounded and length at least three times longer than width) are not acceptable.3.7.5 Castings shall not be peened, plugg
37、ed, impregnated, or welded unless authorized by purchaser.3.7.5.1 When authorized by purchaser, welding with AMS 4246 alloy filler metal in accordance with AMS 2694, or other welding program approved by purchaser, may be used.TABLE 4 - Radiographic Acceptance Criteria (1)DiscontinuityRadiographRefer
38、enceDesignatedAreasOtherAreasGas holes 1.1 1 2Gas porosity (round) 1.21 1 3Gas porosity (elongated) 1.22 1 3Shrinkage cavity 2.1 1 2Shrinkage porosity or sponge 2.2 1 2Foreign material (less dense) 3.11 1 2Foreign material (more dense) 3.12 1 2Segregation - none noneCracks - none noneCold shuts - no
39、ne noneLaps - none none1Maximum allowable discontinuity using reference radiographs foraluminum castings in accordance with ASTM E 155.SAE INTERNATIONAL AMS4288 Page 6 of 12_ 4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of castings shall supply all samples for vendo
40、rs tests and shall be responsible for the performance of all required tests. All testing shall be performed at facilities acceptable to purchaser. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the castings conform to specified requirem
41、ents.4.2 Classification of Tests: 4.2.1 Acceptance Tests: Composition (3.1), tensile properties (3.6.1), and quality (3.7) are acceptance tests and shall be performed on each casting, melt, or heat treat lot, as applicable under 4.3.4.2.2 Periodic Tests: Microstructure (3.6.2) is a periodic test and
42、 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 material an
43、d/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 For Acceptance Tests: 4.3.1.1 One chemical analysis specimen in accordance with 3.4.1 from each melt for conformance
44、 to 3.1.4.3.1.2 Tensile specimens cut from castings as in 3.4.2 shall be tested for conformance to 3.6.1.1 as follows:4.3.1.2.1 First 30 Castings Received: One casting from each 10 production castings shall be selected for destructive testing.4.3.1.2.2 Castings Received Thereafter: If no failure occ
45、urs in 4.3.1.2.1, one casting from each 25 production castings consecutively received thereafter. If a failure occurs, the test frequency reverts to one from each 10 production castings for the next 30 castings received.4.3.1.2.3 If specimen locations are not shown on the drawing, two specimens from
46、 the thickest designated area and two specimens from the thinnest designated area shall be cut from the selected casting(s) and tested.4.3.1.3 One or more tensile specimens from integrally cast coupons as in 3.4.3 shall be tested for each casting to the requirements of Table 2, or as specified by pu
47、rchaser.SAE INTERNATIONAL AMS4288 Page 7 of 12_ 4.3.1.4 Each casting for radiographic inspection in accordance with 3.7.3, unless a sampling plan is specified by purchaser.4.3.1.5 Each casting for penetrant inspection in accordance with 3.7.4, unless a sampling plan is specified by purchaser.4.3.2 For Periodic Tests and Preproduction Tests: As agreed upon by purchaser and vendor.4.4 Approval: 4.4.1 Sample castings from new or reworked patterns a
