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/AMS4443H AEROSPACE MATERIAL SPECIFICATION AMS4443 REV. H Issued 1956-07 Revised 2017-06 Superse
5、ding AMS4443G Magnesium Alloy, Sand Castings 4.5Zn - 0.75Zr (ZK51A-T5) Precipitation Heat Treated (Composition similar to UNS M16510) RATIONALE AMS4443H revises Quality (3.7.4), Sampling and Testing (4.3.1), Reports (4.5.1), Identification (5.1.2) and Packaging (5.2.1), and is a Five-Year Review and
6、 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 requiring a combination of good yield strength and elongation, but usage is not limited to such applications. 2
7、. 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 is specified. When the referenced d
8、ocument 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 and Canada) or +1 724-776-4970 (ou
9、tside USA), www.sae.org. AMS2175 Castings, Classification and Inspection of AMS2360 Room Temperature Tensile Properties of Castings AMS2475 Protective Treatments Magnesium Alloys SAE INTERNATIONAL AMS4443H Page 2 of 8 AMS2768 Heat Treatment of Magnesium Alloy Castings AMS2694 In-Process Welding of C
10、astings AMS2804 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 W
11、rought and Cast Aluminum- and Magnesium-Alloy Products ASTM B557M Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products (Metric) ASTM B953 Sampling Magnesium and Magnesium Alloys for Spectrochemical Analysis ASTM B954 Analysis of Magnesium and Magnesium Alloys by Atomic Emission Sp
12、ectrometry ASTM E10 Brinell Hardness of Metallic Materials ASTM E29 Using Significant Digits in Test Data to Determine Conformance with Specifications ASTM E155 Reference Radiographs for Examination of Aluminum and Magnesium Castings ASTM E1417/E1417M Liquid Penetrant Testing ASTM E1742/E1742M Radio
13、graphic 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 acceptable to purchaser. Table 1 - Composition Element Min Max Zinc 3.6 5.5 Zi
14、rconium, total 0.50 1.0 Copper - 0.10 Nickel - 0.01 Other Elements, each (3.1.1) - 0.10 Other Elements, total (3.1.1) - 0.30 Magnesium remainder SAE INTERNATIONAL AMS4443H Page 3 of 8 3.1.1 Determination not required for routine acceptance. 3.1.2 Test results may be rounded by the “rounding off” met
15、hod of ASTM E29. 3.2 Condition Precipitation heat treated. 3.3 Casting Castings shall be produced 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 shall be added to the me
16、lt. 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 converted to ingot, analyzed, and remelted or unless the composition of a sample taken after the last add
17、ition 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 or less as melted for pouring castings or, when permitted by purchaser, a melt shall be 4000 pounds or less of metal withdrawn from one continuous furnace in not more than 8 consec
18、utive hours. 3.3.2 A lot shall be all castings poured from a single melt in not more than 8 consecutive hours and solution and precipitation heat treated in the same heat treat batch. 3.4 Test Specimens Chemical analysis specimens and tensile specimens shall be cast as follows: 3.4.1 Chemical Analys
19、is 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. 3.4.2 Tensile Specimens Shall be prepared as follows and tested for conformance to 3.6.1: 3.4.2.1 Unless specimens cut from castings are specified by the purchaser, separatel
20、y 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 castings. Chills are not permitted on test specimen cavity except on the end face of the specimen when appro
21、ved in accordance with 4.4.2. Tensile specimens shall be processed with each heat treat lot. 3.4.2.2 When purchaser specifies specimens cut from castings or from integrally cast coupons, such specimens shall be removed after heat treatment, shall be machined to conform to ASTM B557 or ASTM B557M, an
22、d shall be either 0.500 inch (12.70 mm) diameter at the reduced parallel gage section, subsize specimens proportional to the standard, or standard sheet-type specimens. 3.5 Heat Treatment Shall be in accordance with AMS2768. Unless specimens cut from castings or from integrally-cast coupons are spec
23、ified, 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 3 hours. SAE INTERNATIONAL AMS4443H Page 4 of 8 3.6 Properties Castings, integrally-cast c
24、oupons, and representative 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 the basis for acceptance of casti
25、ngs except when purchaser specifies that specimens shall be cut from castings (see 3.6.1.2) or from integrally-cast coupons (see 3.6.1.2). 3.6.1.1 Separately-Cast Specimens Shall have the properties shown in Table 2. Table 2 - Minimum tensile properties Property Value Tensile Strength Yield Strength
26、 at 0.2% Offset Elongation in 4D 34.0 ksi (234 MPa) 20.0 ksi (138 MPa) 5% 3.6.1.2 Specimens Cut from Castings or from Integrally-Cast Coupons When specified by purchaser, specimens obtained by sampling in accordance with 4.3.4 shall meet the requirements of Table 3, unless otherwise specified as in
27、3.6.1.2.1. Table 3 - Minimum tensile properties Property Value Tensile Strength Yield Strength at 0.2% Offset Elongation in 4D 24.0 ksi (165 MPa) 14.0 ksi ( 96 MPa) 1.25% 3.6.1.2.1 Properties other than those shown in Table 3, may be specified for specific casting locations. Properties may be design
28、ated in accordance with AMS2360. 3.7 Quality 3.7.1 Castings, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the castings. 3.7.1.1 Castings shall have smooth surfaces sufficiently cleaned to pe
29、rmit fluorescent penetrant inspection. 3.7.1.2 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 prior to protective treatment as in 5.2. 3.7.2 Castings shall be produced under radiographic control. This
30、 control shall consist of 100% radiographic inspection of castings until process control factors (4.4.2) have been established to ensure production of acceptable castings. Unless otherwise specified by the purchaser, continued radiographic inspection of production castings shall be performed at a fr
31、equency determined by the vendor to assure continued maintenance of internal quality. 3.7.3 Methods of inspection and frequency of inspection shall be as agreed upon by purchaser and vendor. A “Casting Class” of AMS2175 may be selected to specify the method and frequency of inspection. 3.7.4 When ac
32、ceptance standards are not specified, Grade C of AMS2175 shall apply 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. ASTM E155 may be used to define radiographic acceptance standards. SAE I
33、NTERNATIONAL AMS4443H Page 5 of 8 3.7.5 Radiographic inspection shall be conducted in accordance with ASTM E1742/E1742M, unless otherwise specified by purchaser. 3.7.6 When specified by purchaser, castings shall be fluorescent penetrant inspected using a method specified by the purchaser, or, if not
34、 specified, a method in accordance with ASTM E1417/E1417M. 3.7.7 Castings shall not be peened, plugged, impregnated, or welded unless authorized by purchaser. 3.7.7.1 When authorized by purchaser, welding in accordance with AMS2694 or other welding program approved by the purchaser may be used. 4. Q
35、UALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of castings shall supply all samples for vendors 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 ensur
36、e that the castings conform to the specified requirements. 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) or, when specified, tensile properties of specimens cut from castings or integral
37、ly-cast coupons (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 or from integrally-cast coupons shall be determined when specified by purchaser or when separately-cast spec
38、imens are not available. Tensile properties of separately-cast specimens need not be determined when tensile properties of specimens cut from castings or from integrally-cast coupons are determined. 4.2.2 Periodic Tests Radiographic inspection (3.7.2) following the establishment of process control (
39、4.4.2) is a periodic test and 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 prior to or on the first-article shipment of a casting to
40、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 accordance with the following: 4.3.1 One chemical analysis specimen in accordance with 3.4.1 and with ASTM B953
41、, from each melt for conformance to 3.1. 4.3.2 One separately-cast tensile specimen in accordance with 3.4.2 from each lot except when purchaser requires properties of specimens machined from castings or from integrally-cast coupons. 4.3.3 One or more preproduction castings in accordance with 4.4.1
42、of each part number. SAE INTERNATIONAL AMS4443H Page 6 of 8 4.3.4 Except as permitted by 4.3.4.1, one or more castings from each lot when tensile properties are required from specimens machined from castings. For determining conformance to the requirements of 3.6.1.2, if specimen locations are not s
43、hown on the drawing, two specimens from the thickest section, and two from the thinnest section, shall be cut from a casting or castings from each lot. 4.3.4.1 When permitted by purchaser, tensile specimens conforming to ASTM B557 or ASTM B557M excised from integrally-cast coupons may be used in lie
44、u 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 castings from new or reworked patterns and the casting procedure shall be approved by purcha
45、ser before castings for production use are supplied, unless such approval 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
46、casting procedure and shall be used for producing production castings. Vendor shall also establish a single procedure for production of separately-cast tensile specimens. Method for production of separately-cast tensile specimens shall be consistent for all material cast to this specification. Contr
47、ol factors for separately cast tensile specimens must generally represent, but need not be identical to, those factors used for castings. If necessary to make any change in parameters for the process control factors, vendor shall submit for reapproval a statement of the proposed changes in processin
48、g and, when requested, 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 Process control factors for producing castings include, but are not limited to, the following; suppliers procedures s
49、hall identify tolerances, ranges, and/or control limits, as applicable: Type of furnace Furnace atmosphere 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 applicable Metal pouring temperature; variation of 50 F (28 C) is permissible Solidification and cooling pro
