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/AMS4998E AEROSPACE MATERIAL SPECIFICATION AMS4998 REV. E Issued 1977-03 Revised 2013-03 Reaffir
5、med 2017-06 Superseding AMS4998D Titanium Alloy Powder 6Al - 4V (Composition similar to UNS R56400) RATIONALE AMS4998E has been reaffirmed to comply with the SAE Five-Year Review policy. 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of prealloyed powder. 1.2 Application Th
6、is powder has been used typically for compaction into net or near net shapes and into forging stock in the form of billets or preforms, but usage is not limited to such applications. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in
7、 this specification may involve the use of hazardous materials, this specification does not address the hazards that may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionar
8、y measures to ensure the health and safety of all personnel involved. 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 docume
9、nt 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 Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096
10、-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys SAE INTERNATIONAL AMS4998E Page 2 of 6 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West
11、 Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B 214 Sieve Analysis of Granular Metal Powders ASTM B 215 Sampling Metal Powders ASTM B 311 Density Determination for Powder Metallurgy (P/M) Materials Containing Less than Two Percent Porosity ASTM B 527 Determination of Tap Densit
12、y of Metallic Powders and Compounds ASTM E 539 X-Ray Emission Spectrometric Analysis of 6AI-4V Titanium Alloy ASTM E 1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Technique ASTM E 1447 Determination of Hydrogen in Titanium and Titanium Alloys by th
13、e Inert Gas Fusion Thermal Conductivity/Infrared Detection Method ASTM E 1941 Determination of Carbon in Refractory and Reactive Metals and Their Alloys ASTM E 2371 Analysis of Titanium and Titanium Alloys by Atomic Emission Plasma Spectrometry 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform
14、 to the percentages by weight shown in Table 1; carbon shall be determined in accordance with ASTM E 1941, hydrogen in accordance with ASTM E 1447, oxygen and nitrogen in accordance with ASTM E 1409, and other elements in accordance with ASTM E 539 and ASTM E 2371. Other analytical methods may be us
15、ed if acceptable to the purchaser. TABLE 1 - COMPOSITION Element min max Aluminum Vanadium Oxygen Iron Carbon Tin (3.1.1) Molybdenum (3.1.1) Copper (3.1.1) Manganese (3.1.1) Zirconium Nitrogen Hydrogen (3.1.2) Other Elements, total (3.1.3) Titanium 5.50 3.50 0.13 - - - - - - - - - - remainder 6.75 4
16、.50 0.18 0.30 0.10 0.10 0.10 0.10 0.10 0.10 0.04 0.012 0.20 (400 ppm) (120 ppm) 3.1.1 Tin plus molybdenum plus copper plus manganese shall not exceed 0.20%. 3.1.2 Sample size may be as large as 0.35 gram. SAE INTERNATIONAL AMS4998E Page 3 of 6 3.1.3 Determination not required for routine acceptance.
17、 3.1.4 Check Analysis Composition variations shall meet the applicable requirements of AMS2249. 3.2 Powder Production Powder shall be produced in lots by a suitable process in an appropriate noncontaminating atmosphere. A lot shall be all powder produced from common feed material (an ingot, billet,
18、or cast electrode from a common ingot) in one production run of the equipment. When approved by purchaser, a lot may be the powder produced from common feed material in a series of consecutive runs in the same equipment under essentially the same fixed parameters; the powder from all such runs shall
19、 be thoroughly blended. The total weight of powder blended in one lot shall not exceed 10 000 pounds (4536 kg). 3.2.1 For powder production processes that involve the melting of the input stock. Alloy shall be multiple melted. The first melt shall be made by consumable electrode, nonconsumable elect
20、rode, electron beam cold hearth, or plasma arc cold hearth melting practice. The subsequent melt or melts shall be made under vacuum using vacuum arc remelting (VAR) practice. Alloy additions are not permitted in the final VAR melt. 3.2.2 For powder production processes that do not melt the input st
21、ock. Alloy shall be melted a minimum of three times. The first melt shall be made by consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice. The subsequent melts shall be made under vacuum using vacuum arc remelting (VAR) practice. Alloy
22、additions are not permitted in the final VAR melt. 3.2.3 The atmosphere for nonconsumable electrode melting shall be vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercury. 3.2.4 The electrode tip for nonconsumable electrode melting shall be water-cooled co
23、pper. 3.3 Condition As manufactured. 3.4 Properties The powder shall conform to the following requirements: 3.4.1 Particle Size The particles shall pass through a No. 35 (500 m) sieve, with not more than 5% by weight passing through a No. 325 (45 m) sieve, determined in accordance with ASTM B 214 or
24、 other method acceptable to purchaser. 3.4.2 Powder Tap Density When specified, shall be not less than 60% of the density value obtained in 3.4.3, determined in accordance with ASTM B 527 or other procedure acceptable to purchaser. SAE INTERNATIONAL AMS4998E Page 4 of 6 3.4.3 Powder Compaction and E
25、valuation A sample, weighing not less than 0.75 pound (340 grams), from each powder lot shall be hot-compacted using a method that will not contaminate the powder particles during compaction. Each compacted sample shall have a density, determined in accordance with ASTM B 311, not less than 0.1594 p
26、ounds per cubic inch (4.412 Mg/m3) and shall be divided into panels or discs totaling not less than 18 square inches (116 cm2) in area with thickness of 0.200 inch + 0.015, - 0.025 (5.08 mm, + 0.38, - 0.64). Panels shall be free of any deleterious high- or low-density inclusions determined by radiog
27、raphic method acceptable to purchaser. Exceptions shall be provided by standards agreed upon by purchaser and vendor. 3.5 Quality The powder, as received by purchaser, shall be uniform in color and quality, dry, free from agglomerated masses, and free from foreign materials and from imperfections de
28、trimental to its performance during compaction or in resultant preforms or forgings. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of powder shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserve
29、s the right to sample and to perform any confirmatory testing deemed necessary to ensure that the powder conforms to specified requirements. 4.2 Classification of Tests All technical requirements are acceptance tests and preproduction tests and shall be performed prior to or on the initial shipment
30、of powder to a purchaser, on each lot, when a change in ingredients 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 ASTM B 215; sufficient powder shall be taken from each lot to perf
31、orm all required tests in duplicate. 4.4 Approval 4.4.1 The processes and control procedures, a preproduction sample, or both, whichever is specified, shall be approved by the cognizant engineering organization before powder for production parts is supplied. 4.4.2 The supplier shall make no signific
32、ant changes to ingredients, processes, or controls from those that the approval was based, unless the change is approved by the cognizant engineering organization. A significant change is one that, in the judgment of the cognizant engineering organization, could affect the properties or performance
33、of the powder. 4.5 Reports The vendor shall provide a copy of the original material manufacturers (producers) report (material certification) including: producer name and country where the material was melted (i.e. final melt in the case of metal processed by multiple melting operations). The report
34、 shall document the results of tests for composition of each heat and the oxygen and hydrogen content of each lot and stating that the powder conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS4998E, vendors product designation
35、, feed material, and quantity. SAE INTERNATIONAL AMS4998E Page 5 of 6 4.6 Resampling and Retesting If any specimen used in the above tests fails to meet the specified requirements, disposition of the powder may be based on the results of testing three additional specimens for each original nonconfor
36、ming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the powder represented. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Packaging and Identification 5.1.1 Powder shall be packaged in containers of a type and siz
37、e acceptable to purchaser. A lot may be packaged in small quantities and delivered separately under the basic lot approval provided lot identity is maintained. Each container shall be thoroughly cleaned and dried immediately prior to filling, and shall be sealed immediately after filling to protect
38、the contents from contamination during shipment and under normal dry storage conditions. Seals used on the containers shall be so designed that they must be destroyed in order for the container to be opened. 5.1.2 Each individual container shall be legibly identified with not less than the following
39、 information, using characters that will not be obliterated by normal handling: TITANIUM ALLOY POWDER, 6Al - 4V AMS4998E MANUFACTURERS IDENTIFICATION PURCHASE ORDER NUMBER QUANTITY PRODUCTION METHOD LOT NUMBER 5.1.3 Individual containers shall be packaged in an exterior shipping container that will
40、protect the powder, during shipment and storage, against damage from exposure to weather or any other normal hazard. 5.1.4 Each exterior shipping container shall be legibly marked with not less than the following information in a manner that the markings will not smear or be obliterated during norma
41、l handling and use: TITANIUM ALLOY POWDER, 6Al - 4V AMS4998E MANUFACTURERS IDENTIFICATION PURCHASE ORDER NUMBER QUANTITY PRODUCTION METHOD LOT NUMBER SPECIAL MARKINGS (as applicable) 5.1.5 Containers of powder shall be prepared for shipment in accordance with commercial practice and in compliance wi
42、th applicable rules and regulations pertaining to the handling, packaging, and transportation of the powder to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A vendor shall include this specification number and its revision letter in all quotations and when acknowledging purchase ord
43、ers. 7. REJECTIONS Powder not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. SAE INTERNATIONAL AMS4998E Page 6 of 6 8. NOTES 8.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas where techni
44、cal 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 revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that
45、contain editorial changes only. 8.2 Terms used in AMS are clarified in ARP1917; definitions of terms used in AMS4998E are presented in ASTM B 243. 8.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temp
46、eratures are shown as the approximate equivalents of the primary units and are presented only for information. 8.4 Purchase documents should specify not less than the following: AMS4998E Size of containers desired (See 5.1.1) Quantity of product desired Tap density, if applicable. PREPARED BY AMS COMMITTEE “G“
