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 2017 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:/standards.sae.org/AMS4434N AEROSPACE MATERIAL SPECIFICATION AMS4434 REV. N Issued 1941-09 Revised 2017-12 Superse
5、ding AMS4434M Magnesium Alloy Castings, Sand 9.0Al - 2.0Zn (AZ92A-T6) Solution and Precipitation Heat Treated (Composition similar to UNS M11920) RATIONALE AMS4434N revises Condition (3.2), Chemical Analysis Specimens (3.4.1), Heat Treatment (3.5), Reports (4.5.1), Identification (5.1.2), and Protec
6、tive Treatment (5.2) and results from a Five-Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers a magnesium alloy in the form of sand castings. 1.2 Application These castings have been used typically for parts operating in service up to 300 F (149 C), but usage
7、 is not limited to such application. 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 iss
8、ue 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
9、USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2360 Room Temperature Tensile Properties of Castings AMS2475 Protective Treatments Magnesium Alloys AMS2694 In-Process Welding of Castings AMS2768 Heat Treatment of Magnesium Alloy Castings SAE INTERNATIONAL AMS4434N Page 2 of 8 AMS28
10、04 Identification Castings ARP1917 Clarification of Terms Used in Aerospace Metals Specifications 2.2 ASTM Publications 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 Ca
11、st Aluminum- and Magnesium-Alloy Products ASTM B557M Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products (Metric) ASTM B660 Packaging/Packing of Aluminum and Magnesium Products ASTM B953 Sampling Magnesium and Magnesium Alloys for Spectrochemical Analysis ASTM B954 Analysis of Ma
12、gnesium and Magnesium Alloys by Atomic Emission Spectrometry ASTM E10 Brinell Hardness of Metallic Materials ASTM E155 Reference Radiographs for Inspection of Aluminum and Magnesium Castings ASTM E1417/E1417M Liquid Penetrant Testing ASTM E1742/E1742M Radiographic Examination 3. TECHNICAL REQUIREMEN
13、TS 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 acceptable to purchaser: Table 1 - Composition Element Min Max Aluminum 8.3 9.7 Zinc 1.6 2.4 Manganese 0.10 0.35 Silicon -
14、 0.30 Copper - 0.10 Nickel - 0.01 Other Elements, each - 0.10 Other Elements, total - 0.30 Magnesium remainder 3.1.1 Determination of residual elements is not required for routine acceptance. 3.2 Condition Solution and precipitation heat treated to the T6 temper in accordance with AMS2768. SAE INTER
15、NATIONAL AMS4434N Page 3 of 8 3.3 Casting Castings shall be produced in lots from metal conforming to 3.1. Metal remelted from previously analyzed ingot may be poured directly into castings. Furnace or ladle additions of grain-refining elements or alloys are permissible. If grain-refining elements a
16、re not added, the molten metal shall be subjected to superheating or other grain-refining treatment. Molten metal taken from alloying furnaces, with or without additions of foundry operating scrap (gates, sprues, risers, and rejected castings), shall not be poured into castings unless first converte
17、d 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 castings or, when permitted by purchaser, a
18、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 and solution and precipitation heat treated in the same heat treat
19、 batch. 3.4 Cast Test Specimens Chemical analysis specimens and tensile specimens shall be cast as follows and, when requested, shall be supplied with the castings: 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
20、 as in 3.1. 3.4.2 Tensile Specimens Shall be cast with each lot of castings, shall be of standard proportions conforming to ASTM B557 or ASTM B557M with 0.500 inch (12.70 mm) diameter at the reduced parallel gage section, and shall be cast to size in molds made with the regular foundry mix of sand w
21、ithout using chills. Metal for the specimens shall be part of the melt which is used for the castings and shall be subjected to the same grain-refining or alloying treatment given the metal for the castings. The temperature of the molten metal during pouring of the specimens shall be not lower than
22、that during pouring of the castings. 3.5 Heat Treatment Castings and representative tensile specimens shall be solution and precipitation heat treated in accordance with AMS2768; at least one set of tensile specimens shall, during each stage of heat treatment, be placed into a batch-type furnace wit
23、h each load of castings or into a continuous furnace at intervals of not longer than 3 hours. 3.6 Properties Castings and separately-cast tensile specimens produced in accordance with 3.4.2 shall conform to the following requirements: 3.6.1 Tensile Properties Shall be as follows, determined in accor
24、dance with ASTM B557 or ASTM B557M; conformance to the requirements of 3.6.1.1 shall be used as the basis for acceptance of castings except when purchaser specifies that the requirements of 3.6.1.2 apply: SAE INTERNATIONAL AMS4434N Page 4 of 8 3.6.1.1 Separately-Cast Specimens Specimens as in 4.3.2
25、shall have the properties shown in Table 2. Table 2 - Minimum tensile properties Property Value Tensile Strength 34.0 ksi (234 MPa) Yield Strength at 0.2% Offset 18.0 ksi (124 MPa) Elongation in 4D 1.0% 3.6.1.2 Specimens Cut from Castings 3.6.1.2.1 The average of not less than four, and preferably t
26、en, specimens cut from thick and thin sections determined on specimens as in 4.3.4, shall be as shown in Table 3: Table 3 - Minimum tensile properties Property Value Tensile Strength 25.5 ksi (176 MPa) Yield Strength at 0.2% Offset 16.0 ksi (110 MPa) Elongation in 4D 0.75% 3.6.1.2.2 Any specimen cut
27、 from a casting shall meet the values shown in Table 4. Table 4 - Minimum tensile values Property Value Tensile Strength 17.0 ksi (117 MPa) Yield Strength at 0.2% Offset 13.0 ksi ( 93 MPa) 3.6.1.2.3 When properties other than those specified in 3.6.1.2.1 and 3.6.1.2.2 are required, tensile specimens
28、 as in 4.3.4 machined from designated 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 specimens. Property requirements may be designated in accordance with AMS2360. 3.7 Quality 3.7.1 Cas
29、tings, 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. 3.7.1.1 Castings shall have smooth surfaces and shall be sufficiently cleaned to permit fluorescent penetrant examination. 3
30、.7.1.2 Castings cleaned by blasting shall be pickled in a sulfuric or sulfuric-nitric acid solution to remove not less than 0.002 inch (0.05 mm) of metal. 3.7.2 Castings shall be produced under radiographic control. This control shall consist of radiographic examination of castings in accordance wit
31、h ASTM E1742/E1742M, or other radiographic procedures acceptable to purchaser, until proper foundry technique, 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 quali
32、ty. 3.7.3 When specified, castings shall be subjected to fluorescent penetrant inspection in accordance with ASTM E1417/E1417M. 3.7.4 Radiographic, fluorescent penetrant, and other quality standards shall be as agreed upon by purchaser and producer. ASTM E155 may be used to define radiographic accep
33、tance standards. SAE INTERNATIONAL AMS4434N Page 5 of 8 3.7.5 Castings shall not be reworked by peening, plugging, welding, or other methods without written permission from purchaser. 3.7.5.1 When authorized by purchaser, castings may be welded in accordance with AMS2694. 3.7.6 Castings shall not be
34、 impregnated, chemically treated, or coated to prevent leakage unless specified or allowed by written permission of purchaser, designating the method to be used. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of castings shall supply all samples for producers tests an
35、d 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 specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), tensi
36、le properties of separately-cast specimens (3.6.1.1) or, when specified, tensile properties of specimens cut from castings (3.6.1.2), and quality (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 s
37、hall be determined only when specified by purchaser or when separately-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 Preproduction Tests All technical requirements
38、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 be required. 4.3 Sampling and Testing Shall be in accord
39、ance with the following: 4.3.1 At least one chemical analysis specimen in accordance with 3.4.1 and with ASTM B954 from each melt or a casting from each lot. 4.3.2 One separately-cast tensile specimen in accordance with 3.4.2 from each lot. If purchaser requires properties of specimens cut from cast
40、ings, testing of separately-cast tensile specimens is not required. 4.3.3 Two preproduction castings in accordance with 4.4.1 of each part number. 4.3.4 One or more castings from each lot when tensile properties are required from specimens cut from castings. Specimens shall conform to ASTM B557 or A
41、STM B557M and shall be either 0.500 inch (12.70 mm) diameter at the reduced parallel gage section, sub-size specimens proportional to the standard, or standard sheet-type specimens. For determining conformance to the requirements of 3.6.1.2, if specimen locations are not shown on the drawing, not le
42、ss 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. SAE INTERNATIONAL AMS4434N Page 6 of 8 4.4 Approval 4.4.1 Sample castings from new or reworked patterns and the casting procedure shall be approved
43、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 part number, parameters for the process control factors which will produce acceptable castings; these shall constitute
44、the approved casting procedure and shall be used for producing production 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 requested, test specimens, sample castin
45、gs, or both. Production castings incorporating the revised operations shall not be shipped prior to receipt of reapproval. 4.4.2.1 Process control factors for producing castings include, but are not limited to the following; suppliers procedures shall identify tolerances, ranges, and/or control limi
46、ts, as applicable: Type of furnace Furnace atmosphere Grain refining practice Maximum amount of alloy per melt lot Alloy additions, fluxing, deoxidation, and gas removal procedures Gating and risering practices Mold composition and molding practice Core composition and fabrication method, when appli
47、cable Metal pouring temperature; variation of 50 F (28 C) from the established limit is permissible Solidification and cooling procedures Solution and precipitation heat treatment cycles Cleaning operations Methods of inspection Radiographic inspection sampling plan, if used. 4.4.2.1.1 Any of the ab
48、ove process control factors for which parameters are considered proprietary 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
49、results of tests for composition of at least one casting or of separately-cast specimens from each melt and for tensile properties of separately-cast specimens representing each lot or of specimens cut from castings from each lot, and stating that the castings conform to the other technical requirements. This report shall include the purchase order number, lot number, AMS4434N, part number, and quantity. The report shall als
