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 ther
2、efrom, 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 2017 SAE International All rights reserved. No part of this
3、publication 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: +1 724-776-49
4、70 (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:/standards.sae.org/AMS4261G AEROSPACE MATERIAL SPECIFICATION AMS4261 REV. G Issued 1964-06 Reaffirmed 2006-04 Rev
5、ised 2017-03 Superseding AMS4261F Aluminum Alloy Castings, Investment 7.0Si - 0.32Mg (356.0-T51) Precipitation Heat Treated (Composition similar to UNS A03560) RATIONALE AMS4261G revises Composition (Table 1) and inspection acceptance standards (3.7.1), and is a Five-Year review and update of this s
6、pecification. 1. SCOPE 1.1 Form This specification covers an aluminum alloy in the form of investment castings. 1.2 Application These castings have been used typically for components requiring low weight, moderate strength and soundness, but usage is not limited to such applications. 2. APPLICABLE D
7、OCUMENTS 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 may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has be
8、en cancelled and no superseding 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 +1 724-776-4970 (outside USA), ww
9、w.sae.org. AMS2175 Casting, Classification and Inspection of AMS2360 Room Temperature Tensile Properties of Castings AMS2694 In-Process Welding of Castings AMS2771 Heat Treatment of Aluminum Alloy Castings AMS2804 Identification Castings SAE INTERNATIONAL AMS4261G Page 2 of 7 2.2 ASTM Publications A
10、vailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, 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 Produ
11、cts (Metric) ASTM E29 Using Significant Digits in Test Data to Determine Conformance with Specifications ASTM E34 Chemical Analysis of Aluminum- and Aluminum-Base Alloys ASTM E607 Atomic Emission Spectrometric Analysis of Aluminum and Aluminum Alloys by the Point-to-Plane Technique, Nitrogen Atmosph
12、ere ASTM E716 Sampling and Sample Preparation of Aluminum and Aluminum Alloys for Determination of Chemical Composition by Spark Atomic Emission Spectrometry ASTM E1417/E1417M Liquid Penetrant Testing ASTM E1742/E1742M Radiographic Examination 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform
13、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 E607, or by other analytical methods acceptable to purchaser (see 3.4.1). Table 1 - Composition Element Min Max Silicon 6.5 7.5 Magnesium
14、0.20 0.45 Iron (1)- 0.6 Manganese - 0.35 Zinc - 0.35 Copper - 0.25 Titanium - 0.25 Other Elements, each - 0.05 Other Elements, total - 0.15 Aluminum remainder (1) If iron exceeds 0.45, manganese content shall not be less than one-half iron content. 3.1.1 Test results may be rounded by the “rounding
15、off“ method of ASTM E29. SAE INTERNATIONAL AMS4261G Page 3 of 7 3.2 Condition Precipitation heat treated from the as-cast condition. 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. 3.4 Cast Test Spe
16、cimens 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 E716.
17、 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 B557 or ASTM B557M shall be cast from each melt after the last melt addition. Specimens shall be cast in molds representing the mold formulation used for cast
18、ings. Chills are not permitted on test 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 integrally cast specimens or speci
19、mens cut from a casting, such specimens shall conform to ASTM B557 or ASTM B557M, and shall be either round or rectangular, of standard size or subsize proportional to the standard, heat treated with the castings represented, and tested for conformance to 3.6.1. 3.5 Heat Treatment Shall be in accord
20、ance with AMS2771. Unless specimens cut from a casting are specified, one or more separately-cast tensile 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 not longer than 3 hours. 3.6 Propertie
21、s Castings, integrally-cast coupons, 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 B557 or ASTM B557M; conformance to the requirements of 3.6.1.1 shall be used as basis for acceptanc
22、e of castings except when purchaser specifies that 3.6.1.2 applies. 3.6.1.1 Separately-Cast Specimens and Integrally-Cast Coupons Shall have the properties shown in Table 2. Table 2 - Minimum tensile properties Property Value Tensile Strength 23.0 ksi (159 MPa) Yield Strength at 0.2% Offset 16.0 ksi
23、 (110 MPa) Elongation in 4D 3% 3.6.1.2 Specimens Cut from Castings SAE INTERNATIONAL AMS4261G Page 4 of 7 Specimens as in 4.3.4 shall have the properties shown in Table 3. Table 3 - Minimum tensile properties Property Value Tensile Strength 17.5 ksi (121 MPa) Yield Strength at 0.2% Offset 12.0 ksi (
24、 83 MPa) Elongation in 4D 1% 3.6.1.2.1 When properties other than those of 3.6.1.2 are required, tensile specimens as in 4.3.4 taken from locations 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
25、specimens. Property requirements may be designated in AMS2360 format. 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 When acceptance standards are not
26、 specified, the following applies: Castings shall meet Grade C of AMS2175 and radiographic indications of gas holes, sand spots, and inclusions shall be cause for rejection when closer to the edge than twice their maximum dimension. 3.7.2 Methods of inspection and frequency of inspection shall be as
27、 agreed upon by purchaser and producer. A “Casting Class“ of AMS2175 may be selected to specify the method and frequency of inspection. 3.7.3 Castings shall be produced under radiographic control. This control shall consist of 100% radiographic inspection of castings until process control factors (s
28、ee 4.4.2) have been established to ensure production of acceptable castings. Unless otherwise specified by purchaser, continued radiographic inspection of production castings shall be performed at a frequency determined by the producer to ensure continued maintenance of internal quality. 3.7.4 Radio
29、graphic inspection shall be conducted in accordance with ASTM E1742/E1742M, unless otherwise specified by purchaser. 3.7.5 When specified by purchaser, castings shall be fluorescent penetrant tested using a method specified by purchaser, or, if not specified, a method in accordance with ASTM E1417/E
30、1417M. 3.7.6 Castings shall not be peened, plugged, impregnated, or welded unless authorized by purchaser. 3.7.6.1 When authorized by purchaser, castings may be repaired by welding in accordance with AMS2694 or other welding program approved by purchaser. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsi
31、bility for Inspection The producer of castings shall supply all samples for producers 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 castings conform to speci
32、fied requirements. SAE INTERNATIONAL AMS4261G Page 5 of 7 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 specimens (3.6.1.1), and quality (3.7) are acceptance tests and shall be performed to represent each m
33、elt or heat treat lot as applicable. 4.2.1.1 Tensile properties of specimens cut from a casting or from integrally-cast coupons shall be determined when specified by purchaser or when separately-cast specimens are not available. Tensile properties of separately-cast specimens need not be determined
34、when tensile properties of specimens cut from a casting or from integrally-cast coupons are determined. 4.2.2 Periodic Tests Radiographic inspection (3.7.3) following the establishment of process control (4.4.2) is a periodic test and shall be performed at a frequency selected by the producer unless
35、 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 and/or processing requires reapproval as in 4.4.2, and when purcha
36、ser deems confirmatory testing to be required. 4.3 Sampling and Testing Shall be in accordance with the following: 4.3.1 One chemical analysis specimen in accordance with 3.4.1 from each melt for conformance to 3.1. 4.3.2 A tensile specimen in accordance with 3.4.2 from each heat treat lot, except w
37、hen purchaser specifies use of 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 heat treat lot when properties are required from specimens machined from a casting. For determining con
38、formance to the requirements of 3.6.1.2, if specimen locations are not shown on the drawing, two specimens from the thickest section and two specimens from the thinnest section, shall be cut from a casting or castings from each heat treat lot. 4.3.4.1 When permitted by purchaser, tensile specimens c
39、onforming to ASTM B557 or ASTM B557M excised from integrally-cast coupons may be used in lieu of separately-cast specimens (4.3.2) or specimens cut from a casting or castings (4.3.4). Size, number, and location of integrally-cast coupons shall be as specified by purchaser. 4.4 Approval 4.4.1 Sample
40、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 be waived by purchaser. 4.4.2 Producer shall establish, for production of sample castings of each p
41、art 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. Producer shall also establish a procedure for production of separately-cast tensile specimens. Met
42、hod for production of separately-cast tensile specimens shall be consistent for all cast material. If necessary to make any change in parameters for the process control factors, producer shall submit a statement to the purchaser for reapproval. The statement shall contain the proposed changes in pro
43、cessing and, when requested, test specimens, sample castings, or both. Production castings incorporating the revised operations shall not be shipped prior to receipt of reapproval. SAE INTERNATIONAL AMS4261G Page 6 of 7 4.4.2.1 Control factors for producing tensile specimens and castings include, bu
44、t are not limited to, the following. Producers procedures shall identify tolerances, ranges, and/or control limits, as applicable. Control factors for separately-cast tensile specimens must generally represent, but need not be identical to, those factors used for castings. Type of furnace Furnace at
45、mosphere Alloy additions, fluxing, deoxidation, and gas removal procedures Gating and risering practices Mold composition and molding practice Core composition and fabrication method, when applicable Metal pouring temperature; variation of 50 F (28 C) from the established limit is permissible Solidi
46、fication and cooling procedures Stabilization/precipitation heat treat cycle Straightening procedure, when applicable Cleaning operations Methods of inspection Radiographic inspection sampling plan, if used 4.4.2.1.1 Any of the process control factors for which parameters are considered proprietary
47、by the producer may be assigned a code designation. Each variation in such parameters shall be assigned a modified code designation. 4.5 Reports The producer 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 t
48、ensile properties of separately-cast specimens representing each heat treat lot or of specimens cut from a casting from each heat treat lot, and stating that the castings conform to the other technical requirements. This report shall include the purchase order number, melt and heat treat lot numbers
49、, AMS4261G, part number, and quantity. 4.6 Resampling and Retesting If any specimen used in the above tests fails to meet specified requirements, disposition 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 specified requirements shall be cause for rejection of the castings represented. Results of all tests shall be r
