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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2012 SAE International All rights reserved. No part of this publication m
3、ay 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 (outside U
4、SA) 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:/www.sae.org/technical/standards/AMS4881D AEROSPACE MATERIAL SPECIFICATION AMS4881 REV. D Issued 1976-07 Revised 2012-08 Super
5、seding AMS4881C Nickel-Aluminum-Bronze, Martensitic, Sand, Centrifugal and Continuous Castings 78Cu - 11Al - 5.1Ni - 4.8Fe Quench Hardened and Temper Annealed (Composition similar to UNS C95520) RATIONALE AMS4881D revises form to permit use of continuous castings, clarifies when use of tensile speci
6、mens machined from casting is required (3.4.2, 3.4.2.3, 3.6.1.2.3, 4.2.1, 4.2.1.1), revises hardness (3.6.2.2), and updates wording for permissible welding of castings (3.7.5.1). 1. SCOPE 1.1 Form This specification covers a nickel-aluminum bronze alloy in the form of sand, centrifugal or continuous
7、 castings. 1.2 Application These castings have been used typically for parts requiring a combination of high strength and hardness with some ductility and toughness, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of t
8、he 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 been cancelled and no superseding document has been specified, the last pu
9、blished issue of that document shall apply. SAE AMS4881D Page 2 of 8 2.1 SAE Publications Available from SAE International, 400 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 Proper
10、ties of Castings AMS2630 Inspection, Ultrasonic, Product Over 0.5 Inch (12.7 mm) Thick AMS2694 In-Process Welding of Castings AMS2750 Pyrometry AMS2804 Identification, Castings 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-
11、2959, Tel: 610-832-9585, www.astm.org. ASTM B 208 Preparing Tension Test Specimens for Copper Alloy Sand, Permanent Mold, Centrifugal, and Continuous Castings ASTM E 8/E 8M Tension Testing of Metallic Materials ASTM E 18 Rockwell Hardness of Metallic Materials ASTM E 478 Chemical Analysis of Copper
12、Alloys ASTM E 1417 Liquid Penetrant Testing ASTM E 1742 Radiographic Examination 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 478, by spectrochemical methods, or by other analytical
13、 methods acceptable to purchaser. TABLE 1 - COMPOSITION Element (3.1.1) min max Copper (3.1.2) 74.5 - Aluminum 10.5 11.5 Nickel 4.2 6.0 Iron 4.0 5.5 Manganese - 1.5 Zinc - 0.30 Tin - 0.25 Cobalt - 0.20 Silicon - 0.15 Chromium - 0.05 Lead - 0.03 Sum of Named Elements (3.1.3) 99.8 - SAE AMS4881D Page
14、3 of 8 3.1.1 These composition limits do not preclude the presence of other elements. Limits may be established and analysis required for unnamed elements by agreement between the manufacturer or supplier and purchaser. 3.1.2 Copper may be reported as “remainder” or as the difference between the sum
15、 of results for all elements and 100%, or as the result of direct analysis. 3.1.3 When all named elements in Table 1 are analyzed, the sum shall be 99.8 percent minimum, but such determination is not required for routine acceptance of each lot. 3.2 Condition Quench hardened and temper annealed (TQ50
16、) (See 8.2). 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. Molten metal taken from alloying furnaces, with or without additions of foundry operating scrap (gates, sprues, risers, and re
17、jected 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 charge of 2000 pounds (907 kg) o
18、r 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 not more than eight consecutive
19、 hours and quench hardened and temper annealed in the same heat treatment batch. 3.4 Test Specimens 3.4.1 Chemical Analysis Specimens Shall be cast from each melt and be of any convenient size, shape, and form. 3.4.2 Tensile Coupons Shall be cast with each lot of sand cast or centrifugal cast castin
20、gs and as follows: 3.4.2.1 Sand Cast Coupons from which specimens are produced shall be standard keel blocks in accordance with ASTM B 208 cast in molds made with the regular foundry mix of sand, without using chills, or in baked core sand molds. Metal for the coupons shall be part of the melt which
21、 is used for the castings and shall be poured at a temperature not lower than the temperature of the metal during pouring of the castings. If the metal for castings is given any treatment, such as fluxing or cooling and reheating, the metal for the coupons shall be a portion of the metal so treated,
22、 and during such treatment shall be heated to the same maximum temperature and held for approximately the same length of time as the molten metal for the castings. Coupons shall be heat treated with the castings in accordance with 3.5 and machined to standard tensile specimens conforming to ASTM E 8
23、/E 8M with 0.500 inch (12.70 mm) diameter at the reduced parallel gage section. 3.4.2.2 Centrifugally Cast Coupons from which specimens are produced shall be cylindrical bars of such size to allow machining specimens conforming to ASTM E 8/E 8M with 0.500 inch (12.70 mm) diameter at the reduced para
24、llel gage section. Metal for the coupons shall be part of the melt which is used for the castings and shall be poured at a temperature not lower than the temperature of the metal during pouring of the castings. If the metal for castings is given any treatment, such as fluxing or cooling and reheatin
25、g, the metal for the coupons shall be a portion of the metal so treated, and during such treatment shall be heated to the same maximum temperature and held for approximately the same length of time as the molten metal for the castings. SAE AMS4881D Page 4 of 8 3.4.2.3 For continuous castings, the co
26、upons shall be taken longitudinally from the cast product. 3.5 Heat Treatment All castings and representative coupons for tensile specimens shall be solution heat treated by heating to a temperature within the range 1600 to 1700 F (871 to 927 C), holding at the selected temperature within 25 F (14 C
27、) for not less than 2 hours, and quenching in water and tempered by heating to a temperature within the range 925 to 1000 F (496 to 538 C), holding at the selected temperature within 15 F (8 C) for not less than 2 hours, and cooling in air to room temperature. Pyrometry shall be in accordance with A
28、MS2750. 3.6 Properties Castings and representative tensile coupons produced in accordance with 3.4.2, and heat treated as in 3.5, shall conform to the following requirements: 3.6.1 Tensile Properties Shall be as follows, determined in accordance with ASTM E 8/E 8M; conformance to the requirements of
29、 3.6.1.1 shall be used as the basis for acceptance of castings except when purchaser specifies that requirements of 3.6.1.2 apply: 3.6.1.1 Separately-Cast Specimens 3.6.1.1.1 Sand Cast Shall conform to Table 2. TABLE 2 - MINIMUM TENSILE PROPERTIES Property Value Tensile Strength 125 ksi (862 MPa) Yi
30、eld Strength at 0.2% Offset 95.0 ksi (655 MPa) Elongation in 4D 2% 3.6.1.1.2 Centrifugally Cast Shall conform to Table 3. TABLE 3 - MINIMUM TENSILE PROPERTIES Property Value Tensile Strength 130 ksi (896 MPa) Yield Strength at 0.2% Offset 95.0 ksi (655 MPa) Elongation in 4D 3% 3.6.1.2 Specimens Cut
31、From Any Area of a Casting 3.6.1.2.1 Castings 1.00 Inch (25.4 mm) and Under in Nominal Section Thickness 3.6.1.2.1.1 Sand Cast Shall meet the requirements of Table 2. 3.6.1.2.1.2 Centrifugal Cast Shall meet the requirements of Table 3. 3.6.1.2.2 Castings Over 1.00 Inch (25.4 mm) in Nominal Section T
32、hickness SAE AMS4881D Page 5 of 8 3.6.1.2.2.1 Sand Cast Shall conform to Table 4. TABLE 4 - MINIMUM TENSILE PROPERTIES Property Value Tensile Strength 120 ksi (827 MPa) Yield Strength at 0.2% Offset 85.0 ksi (586 MPa) Elongation in 4D 1.5% 3.6.1.2.2.2 Centrifugal Cast Shall conform to Table 5. 3.6.1
33、.2.3 Continuous Cast 2.00 inch (50.8 mm) and Under in Nominal Section Thickness Shall conform to Table 5. TABLE 5 - MINIMUM LONGITUDINAL TENSILE PROPERTIES Property Value Tensile Strength 125 ksi (860 MPa) Yield Strength at 0.2% Offset 90.0 ksi (621 MPa) Elongation in 4D 2% 3.6.1.2.4 When properties
34、 other than those of 3.6.1.2.1, 3.6.1.2.2, or 3.6.1.2.3 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 specified on the drawing for such specimens. Property require
35、ments for such specimens may be designated in accordance with AMS2360. 3.6.2 Hardness Shall be not lower than the following, determined in accordance with ASTM E 18. 3.6.2.1 Sand Castings 25 HRC, or equivalent. 3.6.2.2 Centrifugal and Continuous Castings 28 HRC, or equivalent. 3.7 Quality Castings,
36、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 Castings shall have smooth surfaces and shall be sufficiently cleaned to permit fluorescent penetrant inspection. 3.7.2 Casti
37、ngs shall be produced under radiographic control. This control shall consist of radiographic examination of castings in accordance with ASTM E 1742 until proper foundry technique, which will produce castings free from harmful internal imperfections, is established for each part number and of product
38、ion castings as necessary to ensure maintenance of satisfactory quality. 3.7.3 When specified, castings shall be subjected to ultrasonic inspection in accordance with AMS2630, to fluorescent penetrant inspection in accordance with ASTM E 1417, or to both. SAE AMS4881D Page 6 of 8 3.7.4 Radiographic,
39、 ultrasonic, fluorescent penetrant, and other quality acceptance standards may be agreed upon by purchaser and vendor. 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 permitted in writing by purchaser, weldi
40、ng in accordance with AMS2694 may be performed. 4. QUALITY 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 perfor
41、m any confirmatory testing deemed necessary to ensure that the castings conform to 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, for sand and centrifugal castings
42、) and for continuous castings, or when otherwise specified for sand and centrifugal castings, tensile properties of specimens machined from castings (3.6.1.2), hardness (3.6.2), and quality (3.7) are acceptance tests and shall be performed to represent each melt or lot as applicable. 4.2.1.1 For san
43、d and centrifugal castings, 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 specimens need not be determined when properties of specimens cut from casting
44、s are determined. 4.2.2 Preproduction Tests All 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 confirmat
45、ory 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 or a casting from each lot. 4.3.2 Two separately-cast tensile specimens in accordance with 3.4.2 from each lot except when prop
46、erties of specimens cut from castings are required (See 3.6.1.2, 4.2.1). 4.3.3 Sufficient castings of each part number in accordance with 4.4.1 as required to satisfy dimensional, mechanical property, and quality evaluations. 4.3.4 One or more castings from each lot when properties of specimens mach
47、ined from castings are required. Size, location, and number of specimens machined from castings shall be as specified on the drawing or as agreed upon by purchaser and vendor. When size, location, and number of specimens are not specified, not less than two tensile specimens, one from the thickest s
48、ection and one from the thinnest section, shall be cut from a casting or castings from each lot. 4.3.5 One or more castings from each lot for hardness testing. SAE AMS4881D Page 7 of 8 4.4 Approval 4.4.1 Sample castings from new or reworked master patterns or molds and the casting procedure shall be
49、 approved by purchaser 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 casting procedure and shall be used for producing production castings. If nece
