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/AMS4490K AEROSPACE MATERIAL SPECIFICATION AMS4490 REV. K Issued 1940-01 Revised 2017-05 Supers
5、eding AMS4490J Magnesium Alloy Castings, Die 9.0Al - 0.70Zn (AZ91D, Temper F) As Cast (Composition similar to UNS M11916) RATIONALE AMS4490K revises Chemical Analysis Specimens (3.4), Reports (4.5.1), Identification (5.1.2), and Protective Treatment (5.2), and is a Five Year Review and update of thi
6、s specification. 1. SCOPE 1.1 Form This specification covers a magnesium alloy in the form of die castings. 1.2 Application These castings have been used typically for applications where light weight, near net shape components are desired without a need for high strength, or soundness, but usage is
7、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 may work to a subsequent revision of a document unless a specific document issue
8、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 International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA
9、 and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2475 Protective Treatments Magnesium Alloys AMS2694 In-Process Welding of Castings AMS2804 Identification Castings ARP1917 Clarification of Terms Used in Aerospace Metals Specifications SAE INTERNATIONAL AMS4490K Page 2 of 6 2.2 ASTM Pub
10、lications Available 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 B660 Packaging/Packing of Aluminum and Magnesium Products ASTM
11、B953 Sampling Magnesium and Magnesium Alloys for Spectrochemical Analysis ASTM B954 Analysis of Magnesium and Magnesium Alloys by Atomic Emission Spectrometry ASTM E21 Elevated Temperature Tension Tests of Metallic Materials ASTM E505 Reference Radiographs for Inspection of Aluminum and Magnesium Di
12、e Castings ASTM E1417/E1417M Fluorescent Penetrant Testing ASTM E1742/E1742M Radiograph Examination 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by spectrochemical methods in accordance with ASTM B954 or by other analytical methods
13、 acceptable to purchaser: Table 1 - Composition Element min max Aluminum Manganese (3.1.1) Zinc Silicon Copper Nickel Iron (3.1.2) Other Elements, each Other Elements, total Magnesium 8.3 0.15 0.35 - - - - - - remainder 9.7 0.50 1.0 0.10 0.030 0.002 0.005 0.02 0.30 SAE INTERNATIONAL AMS4490K Page 3
14、of 6 3.1.1 Manganese may be less than 0.15 if the iron to manganese ratio does not exceed 0.032. 3.1.2 Iron may exceed 0.005 if the iron to manganese ratio does not exceed 0.032. 3.2 Condition As cast. 3.3 Casting Castings shall be produced in lots from metal conforming to 3.1. Metal remelted from p
15、reviously analyzed ingot may be poured directly into castings. Furnace or ladle additions of grain-refining elements or alloys are permissible. Molten metal taken from alloying furnaces, with or without additions of foundry operating scrap (gates, sprues, risers, and rejected castings), shall not be
16、 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 charge of 2000 pounds (907 kg) or less as melted for pouring c
17、astings 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 not more than eight consecutive hours. 3.4 Chemical Analysis
18、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. 3.5 Quality 3.5.1 Castings, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usa
19、ge of the castings. 3.5.1.1 Castings shall have smooth surfaces and shall be well cleaned. 3.5.2 When specified, castings shall be produced under radiographic control. This control shall consist of radiographic examination of castings in accordance with ASTM E1742/E1742M until proper foundry techniq
20、ue, which 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. 3.5.3 When specified, castings shall be subjected to fluorescent penetrant inspection in accordance wit
21、h ASTM E1417/E1417M. 3.5.4 Radiographic, fluorescent penetrant, contrast dye penetrant, and other quality standards shall be as agreed upon by purchaser and producer. ASTM E505 may be used to define radiographic acceptance standards. 3.5.5 Castings shall not be peened, plugged, impregnated, or welde
22、d unless authorized by purchaser. 3.5.5.1 When authorized by purchaser, welding in accordance with AMS2694 or other welding program approved by purchaser may be used. 3.5.5.2 Chemical treatment, coating, or other process to prevent leakage shall be performed as specified by drawing or as authorized
23、by purchaser. 3.5.6 Castings shall not be impregnated, chemically treated, or coated to prevent leakage unless specified or allowed by written permission of purchaser, designating the method to be used. SAE INTERNATIONAL AMS4490K Page 4 of 6 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Ins
24、pection 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 the specified requi
25、rements. 4.2 Classification of Tests All technical requirements of this specification are acceptance tests and as preproduction tests and shall be performed prior to or on the first-article shipment of a casting to a purchaser, on each lot, when a change in material and/or processing requires reappr
26、oval as in 4.4.2, and when purchaser deems confirmatory testing to be required. 4.3 Sampling Shall be in accordance with the following: 4.3.1 At least one chemical analysis specimen in accordance with 3.4 and with ASTM B953 from each melt or a casting from each lot. 4.3.2 Two preproduction castings
27、in accordance with 4.4.1 of each part number. 4.4 Approval 4.4.1 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 be waived by purchaser. 4.4.2 Producer shall establish, for pr
28、oduction of sample castings of each part number, parameters for the process control factors that will produce acceptable castings; these shall constitute the approved casting procedure and shall be used for producing production castings. Producer shall also establish control factors for producing se
29、parately cast tensile specimens, but these control factors need not be identical to those used for production of castings. If necessary to make any change in parameters for the process control factors, producer shall submit for reapproval a statement of the proposed changes in processing and, when r
30、equested, test specimens, sample castings, or both. Production castings 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 following: Type of furnace Furnace atmosphere Alloy ad
31、ditions, fluxing, deoxidation, and gas removal procedures Location and number of gates Location and number of knockout pins Mold temperature and tolerances Injection pressure and tolerances Metal injection temperature; variation of 50 F (28 C) from the established limit is permissible Solidification
32、 and cooling procedures Straightening procedure, when applicable Cleaning operations Methods of inspection Radiographic sampling plan, if used. 4.4.2.1.1 Any of the process control factors for which parameters are considered proprietary by the producer may be assigned a code designation. Each variat
33、ion in such parameters shall be assigned a modified code designation. 4.4.2.1.2 Detail of the process control shall be available for purchasers review/audit at the foundry facility. SAE INTERNATIONAL AMS4490K Page 5 of 6 4.5 Reports The producer of castings shall furnish with each shipment a report
34、showing the results of tests for composition of at least one casting or of separately-cast specimens from each melt and stating that the castings conform to the other technical requirements of this specification. This report shall include the purchase order number, lot number, AMS4490K, part number,
35、 and quantity. 4.5.1 When material produced to this specification is beyond the sizes allowed in the scope or tables, or other exceptions are taken to the technical requirements listed in Section 3, (see 5.1.2) the report shall contain a statement “This material is certified as AMS4490K(EXC) because
36、 of the following exceptions:“ and the specific exceptions shall be listed. 4.6 Resampling and Retesting If 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 two additional specimens for each original non
37、conforming 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. 5.1.1 Impregnated castings shal
38、l be marked “IMP“. 5.1.2 When technical exceptions are taken (see 4.5.1), the material shall be marked with AMS4490K(EXC). 5.2 Protective Treatment Prior to shipment, castings shall be coated with a light corrosion-inhibiting oil, unless chrome pickling in accordance with AMS2475 is required by the
39、purchaser. 5.3 Packaging Castings shall be prepared for shipment in accordance with ASTM B660 and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the castings to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A producer
40、 shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Castings not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. SAE INTERNATIONAL AMS4490K Page 6 of 6 8.
41、 NOTES 8.1 Revision Indicator A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete
42、 revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Terms used in AMS are clarified in ARP1917. 8.3 Purchase documents should specify not less than the following: AMS4490K Part number or die number of castings desired Quantity of castings desired. 8.4 Similar Specifications Federal QQ-M-388 is listed for information only and shall not be construed as an acceptable alternate unless all requirements of this AMS are met. PREPARED BY AMS COMMITTEE “D”
