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 theref
2、rom, 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 2013 SAE InternationalAll rights reserved. No part of this publi
3、cation 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: +1 724-776-4970 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS4426BAEROSPACE MATERIAL SPECIFICATIONAMS4426 REV. BIssued 1990-04Revised 2013-09Supersedin
5、g AMS4426ACastings, Sand, Magnesium Alloy5.1Y - 3.0Re - 0.70Zr (WE54A - T6)Solution and Precipitation Heat Treated(Composition similar to UNS M18410)RATIONALEAMS4426B revises chemical analysis standards (3.1), sampling requirements for chemical analysis (4.3.1), removes the requirement for determina
6、tion of soluble zirconium (Table 1, 3.1.2), revises Packaging (5.2.1), and is a Five Year Review and update of this specification.1. SCOPE1.1 FormThis specification covers a magnesium alloy in the form of sand castings.1.2 ApplicationThese castings have been used typically for parts requiring high y
7、ield strength up to 570 F (299 C) and excellent corrosion resistance, but usage is not limited to such applications.2. APPLICABLE DOCUMENTSThe 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
8、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 PublicationsAvailable from SAE International, 4
9、00 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2360 Room Temperature Tensile Properties of CastingsAMS2361 Elevated Temperature Tensile Properties of CastingsAMS2475 Protective Treatments, Magnesium AlloysAMS2
10、694 In-Process Welding of CastingsSAE INTERNATIONAL AMS4426B Page 2 of 7AMS2750 PyrometryAMS2804 Identification, Castings2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM B 557 Tension
11、Testing Wrought and Cast Aluminum -and Magnesium Alloy ProductsASTM B 557M Tension Testing Wrought and Cast Aluminum and Magnesium Alloy Products (Metric)ASTM B 660 Packaging/Packing of Aluminum and Magnesium ProductsASTM B 953 Sampling Magnesium and Magnesium Alloys for Spectrochemical AnalysisASTM
12、 B 954 Analysis of Magnesium and Magnesium Alloys by Atomic Emission SpectrometryASTM E 21 Elevated Temperature Tension Tests of Metallic MaterialsASTM E 155 Reference Radiographs for Inspection of Aluminum and Magnesium CastingsASTM E 1417/E 1417M Liquid Penetrant TestingASTM E 1742/E 1742M Radiogr
13、aphic Examination3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight shown in Table 1, determined by spectrochemical methods in accordance with ASTM B 954, or by other analytical methods acceptable to purchaser:TABLE 1 - COMPOSITIONElement min maxYttrium 4.75 5.5Rare E
14、arths (See 3.1.1) 2.0 4.0Zirconium Total 0.40 1.0Zinc - 0.2Lithium - 0.2Manganese - 0.15Copper - 0.03Iron - 0.01Silicon - 0.01Nickel - 0.005Other Impurities, total (3.1.2) - 0.30Magnesium remainder3.1.1 Rare earths consist of neodymium 1.5 to 2.0% by weight, remainder being principally heavy rare ea
15、rths ytterbium, erbium, dysprosium, and gadolinium. Heavy rare earth fraction is directly related to the yttrium content of the alloy (i.e. yttrium is present as nominal 80% by weight, 20% by weight HRE mixture).3.1.2 Determination not required for routine acceptance.3.2 ConditionSolution and precip
16、itation heat treated.SAE INTERNATIONAL AMS4426B Page 3 of 73.3 CastingFurnace or ladle additions of grain-refining elements or alloys are required. Castings shall be produced from metal conforming to 3.1. Molten metal taken from alloying furnaces, with or without additions of foundry operating scrap
17、 (gates, sprues, risers, and rejected castings), shall not be poured into castings unless first converted to ingot, analyzed, and remelted or unless the composition of a sample taken after the last addition to the melt conforms to 3.1.3.3.1 A melt shall be the metal withdrawn from a batch-furnace ch
18、arge of 2000 pounds (907 kg) or less as melted for pouring castings or, when permitted by purchaser, a melt shall be 4000 pounds (1814 kg) or less of metal withdrawn from one continuous furnace in not more than eight consecutive hours.3.3.2 A lot shall be all castings poured from a single melt in no
19、t more than eight consecutive hours and solution and precipitation heat treated in the same heat treat batch.3.4 Cast Test SpecimensChemical analysis specimens and tensile specimens shall be cast as follows:3.4.1 Chemical Analysis SpecimensShall be cast from each melt after the last melt addition an
20、d shall be tested to qualify the melt lot as in 3.1.3.4.2 Tensile SpecimensShall be cast with each lot of castings, shall be of standard proportions conforming to ASTM B 557 or ASTM B 557M with 0.500 inch (12.70 mm) diameter at the reduced parallel gage section, and shall be cast to size in molds ma
21、de with the regular foundry mix of sand without using chills. Metal for the specimens shall be part of the melt which is used for the castings. If the metal for castings is given any treatment, such as fluxing or cooling and reheating, the metal for the specimens shall be a portion of the metal so t
22、reated and, during such treatment, shall be heated to the same maximum temperature and held for approximately the same time as the molten metal for the castings. Temperature of the metal during pouring of the specimens shall be not lower than that during pouring of the castings.3.5 Heat TreatmentCas
23、tings and representative tensile specimens shall be heated to a temperature not exceeding 985 F (529 C), held at heat for the proper time for solution heat treatment, and quenched as required, reheated to a temperature between 470 to 490 F (243 to 254 C), and held at heat for the proper time for pre
24、cipitation heat treatment. At least one set of 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 of not longer than three hours. Pyrometry shall be in accordance with AMS2750.3.6 Propert
25、iesCastings and representative separately-cast tensile specimens produced in accordance with 3.4.2 shall conform to the following requirements:3.6.1 Tensile PropertiesConformance to the requirements of 3.6.1.1.1 shall be used as the basis for acceptance of castings except when purchaser specifies th
26、at the requirements of 3.6.1.1.2 apply:3.6.1.1 At Room TemperatureShall be as shown in Table 2, determined in accordance with ASTM B 557 or ASTM B 557M:3.6.1.1.1 Separately-Cast SpecimensSAE INTERNATIONAL AMS4426B Page 4 of 7TABLE 2 - MINIMUM TENSILE PROPERTIESProperty ValueTensile Strength 36.0 ksi
27、 (248 MPa)Yield Strength at 0.2% offset 25.0 ksi (172 MPa)Elongation in 4D 2.0%3.6.1.1.2 Specimens Cut From CastingsShall be as shown in Table 3, determined on specimens as in 4.3.4:TABLE 3 - MINIMUM TENSILE PROPERTIESProperty ValueTensile Strength 35.0 ksi (241 MPa)Yield Strength at 0.2% offset 25.
28、0 ksi (172 MPa)Elongation in 4D 2.0%3.6.1.2 At 480 F (249 C)Shall be as shown in Tables 4 and 5, determined in accordance with ASTM E 21 on specimens heated to 480 F + 5 (249 C 3), held at heat for not less than 10 minutes before testing, and tested at 480 F 5 (249 C + 3):3.6.1.2.1 Separately-Cast S
29、pecimensTABLE 4 - MINIMUM TENSILE PROPERTIESProperty ValueTensile Strength 30.0 ksi (207 MPa)Yield Strength at 0.2% offset 23.0 ksi (159 MPa)3.6.1.2.2 Specimens Cut From CastingsTABLE 5 - MINIMUM TENSILE PROPERTIESProperty ValueTensile Strength 28.0 ksi (193 MPa)Yield Strength at 0.2% offset 22.0 ks
30、i (152 MPa)3.6.1.3 When properties other than those specified in 3.6.1.1.2 and 3.6.1.2.2 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
31、 such specimens. Property requirements for such specimens may be designated in accordance with AMS2360, AMS2361, or both.3.7 Quality3.7.1 Castings, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage
32、of the castings.3.7.1.1 Castings shall have smooth surfaces and be sufficiently cleaned to permit fluorescent penetrant inspection.3.7.1.2 Castings cleaned by blasting shall, prior to nondestructive inspection, be pickled in a sulfuric or sulfuric-nitric acid solution to remove not less than 0.002 i
33、nch (0.05 mm) of metal before protective treatment as in 5.2.SAE INTERNATIONAL AMS4426B Page 5 of 73.7.2 Castings shall be produced under radiographic control. This control shall consist of radiographic examination of castings in accordance with ASTM E 1742/E1742M until proper foundry technique, whi
34、ch will produce castings free from harmful internal imperfections, is established for each part number and of production castings as necessary to ensure maintenance of satisfactory quality.3.7.3 When specified, castings shall be subjected to fluorescent penetrant inspection in accordance with ASTM E
35、 1417/E 1417M.3.7.4 Radiographic, fluorescent penetrant, and other quality standards for acceptance shall be as agreed upon by purchaser and vendor. ASTM E 155 may be used to define radiographic acceptance standards.3.7.5 Castings shall not be repaired by peening, plugging, welding, impregnation, or
36、 other methods without written permission from purchaser.3.7.5.1 When authorized by purchaser, defects in castings may be removed and the castings reworked by welding in accordance with AMS2694.3.7.6 Castings shall not be impregnated, chemically treated, or coated to prevent leakage unless specified
37、 or allowed by written permission of purchaser, designating the method to be used.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe vendor of castings shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves t
38、he right to sample and to perform any confirmatory testing deemed necessary to ensure that the castings conform to the specified requirements.4.2 Classification of Tests4.2.1 Acceptance TestsExcept as specified in 4.2.1.1, composition (3.1), tensile properties at room temperature (3.6.1.1), and qual
39、ity (3.7) are acceptance tests and shall be performed to represent each melt or lot as applicable.4.2.1.1 Tensile properties of specimens cut from castings shall be determined only when specified by purchaser or when separately-cast specimens are not available. Tensile properties of separately-cast
40、specimens need not be determined when tensile properties of specimens cut from castings are determined.4.2.2 Periodic TestsTensile properties at 480 F (249 C) (3.6.1.2) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchas
41、er.4.2.3 Preproduction TestsAll 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 confirmatory testing to b
42、e required.4.3 Sampling and TestingShall be in accordance with the following:4.3.1 At least one chemical analysis specimen in accordance with 3.4.1 and ASTM B 953 from each melt for conformance to 3.1.SAE INTERNATIONAL AMS4426B Page 6 of 74.3.2 One separately-cast tensile specimen in accordance with
43、 3.4.2 from each lot except when purchaser requires properties of specimens cut from castings.4.3.3 One preproduction casting in accordance with 4.4.1 of each part number for dimensional evaluation; additional castings shall be provided, when specified by purchaser, for property and quality evaluati
44、on.4.3.4 One or more castings from each lot when properties are required of specimens cut from castings. Specimens 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 st
45、andard sheet-type specimens. For determining conformance to the requirements of 3.6.1.3, if specimen locations are not shown on the drawing, not less than four tensile specimens, two from the thickest section and two from the thinnest section, shall be cut from a casting or castings from each lot.4.
46、3.5 Resampling and RetestingIf any specimen used in the above tests fails to meet the specified requirements, disposition of the castings may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified r
47、equirements shall be cause for rejection of the castings represented. Results of all tests shall be reported.4.4 Approval4.4.1 Sample castings from new or reworked patterns and the casting procedure shall be approved by purchaser before castings for production use are supplied, unless such approval
48、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. If
49、 necessary to 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 casting incorporating the revised operations shall not be shipped prior to receipt of reapproval.4.4.2.1 Control factors for producing castings include, but are not limited to, the foll
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