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: +1 724-776-4970
4、 (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/AMS4993F AEROSPACEMATERIAL SPECIFICATIONAMS4993 REV. F Issued 1982-01 Revised 2017-08 Superseding
5、 AMS4993E Titanium Alloy, Blended Powder Compacts, Sintered 6Al - 4V (Composition similar to UNS R56400) RATIONALE AMS4993F is a Five-Year Review and update of this specification that adds ASTM E2994 (3.1) and removes sample size allowance for hydrogen of Table 1 (covered by ASTM E1447). 1. SCOPE1.1
6、 FormThis specification covers a titanium alloy in the form of compacts produced by pressing and sintering a blend of elemental titanium powder and aluminum-vanadium alloy powder. 1.2 Application These compacts have been used typically for light weight nuts (“B-nuts“) used for connecting fluid lines
7、 to fittings and to equipment, and for other small high-quantity miscellaneous hardware, but usage is not limited to such applications. 1.2.1 Certain processing procedures and service conditions may cause these products to become subject to stress-corrosion cracking; ARP982 recommends practices to m
8、inimize such conditions. 2. APPLICABLE DOCUMENTSThe 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 specifi
9、ed. 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 and Canad
10、a) or +1 724-776-4970 (outside USA), www.sae.org. AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS2644 Inspection Material, Penetrant SAE INTERNATIONAL AMS4993F Page 2 of 9 ARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products ARP1917 Clarification of
11、 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 B311 Density of Powder Metallurgy (PM) Materials Containing Less Than Two Percent Poro
12、sity ASTM E8/E8M Tension Testing of Metallic Materials ASTM E365 Chemical Analysis of Ferrovanadium and Vanadium Alloying Additives ASTM E539 Analysis of Titanium Alloys by X-Ray Fluorescence Spectrometry ASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by Insert Gas F
13、usion. ASTM E1417/E1417M Liquid Penetrant Testing ASTM E1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Insert Gas Fusion Thermal Conductivety/Infrared Detection Method ASTM E1742/E1742M Radiographic Examination ASTM E1941 Determination of Carbon in Refractory and Reactive Meta
14、ls and Their Alloys by Combustion Analysis ASTM E2371 Analysis of Titanium and Titanium Alloys by Direct Current Plasma and Inductively Coupled Atomic Emission Plasma Spectrometry ASTM E2994 Analysis of Titanium and Titanium Alloys by Spark Atomic Emission Spectrometry and Glow Discharge Atomic Emis
15、sion Spectrometry 2.3 ANSI Publications Available from ANSI, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ANSI B46.1 Surface Texture 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall be that resulting from blending elemental titanium powder as in 3.1.3 and aluminum-va
16、nadium alloy powder as in 3.1.4 and shall conform to the percentages by weight shown in Table 1, after pressing and sintering. Carbon shall be determined in accordance with ASTM E1941, hydrogen in accordance with ASTM E1447, oxygen and nitrogen in accordance with ASTM E1409, and other elements in ac
17、cordance with ASTM E539, ASTM E2371 or ASTM E2994. Other analytical methods may be used if acceptable to the purchaser. SAE INTERNATIONAL AMS4993F Page 3 of 9 Table 1 - Composition Element Min Max Aluminum (3.1.1) 5.50 6.75 Vanadium (3.1.1) 3.50 4.50 Iron - 0.30 Oxygen - 0.30 Sodium - 0.15 Chlorine
18、- 0.15 Carbon - 0.10 Silicon - 0.05 Nitrogen - 0.05 (500 ppm) Hydrogen - 0.01 (100 ppm) Other Elements, each - 0.10 Other Elements, total - 0.40 Titanium remainder 3.1.1 The difference in aluminum concentration and vanadium concentration among three different locations in a lot of blended powder sha
19、ll be not greater than 0.4%. 3.1.2 Check Analysis Compositional variations shall meet the applicable requirements of AMS2249. 3.1.3 Titanium Powder Composition Shall conform to the percentages by weight shown in Table 2, determined as in 3.1. Table 2 - Titanium powder composition Element Min Max Iro
20、n - 0.20 Oxygen - 0.20 Sodium - 0.20 Chlorine - 0.20 Carbon - 0.06 Silicon - 0.05 Nitrogen - 0.03 (300 ppm) Hydrogen - 0.015 (150 ppm) Other Elements, each - 0.10 Other Elements, total - 0.40 Titanium remainder 3.1.4 Alloying Powder Composition Shall conform to the percentages by weight shown in Tab
21、le 3, determined by wet chemical methods in accordance with ASTM E365, by spectrochemical methods, or by other analytical methods acceptable to purchaser. SAE INTERNATIONAL AMS4993F Page 4 of 9 Table 3 - Alloy powder composition Element Min Max Aluminum 56 64 Vanadium 38 42 Other Elements, total - 3
22、.0 3.2 Condition As sintered at not lower than 2100 F (1149 C). 3.3 Powder Lot Control The titanium 6Al-4V powder shall be blended in lots by a suitable process in a noncontaminating facility. A powder lot shall be all powder produced as a single mixture in one production blend of titanium powder an
23、d aluminum-vanadium alloy powder. 3.3.1 Whenever a production run of sintered compacts does not require an entire lot of blended powder, the powder used shall be identified as a sub lot. The identity of sub lots in a basic powder lot shall be maintained. 3.3.2 Unused portions of qualified powder lot
24、s not of sufficient size for a production run of sintered compacts may be added to, and blended with, titanium and aluminum-vanadium alloy powders in the production of a new powder lot. In that event, the requirements of Table 1 shall apply to the final powder lot. 3.4 Properties Sintered compacts s
25、hall conform to the following requirements: 3.4.1 Tensile Properties Shall be as shown in Table 4, determined in accordance with ASTM E8/E8M on specimens, of the same powder lot, sintered with the parts represented. Table 4 - Minimum tensile properties Property Value Tensile Strength 130 ksi (896 MP
26、a) Yield Strength at 0.2% Offset 120 ksi (827 MPa) Elongation in 4D 10% Reduction in Area 10% 3.4.2 Proof Test Sintered compacts shall pass a proof or failure test conducted by a procedure developed by the manufacturer and for which a correlation with the tensile properties of 3.4.1 has been establi
27、shed for each configuration and size of sintered compact. 3.4.3 Density Shall be not lower than 0.157 pounds per cubic inch (4346 kg/m3), determined in accordance with ASTM B311 or other method agreed upon by purchaser and producer. SAE INTERNATIONAL AMS4993F Page 5 of 9 3.4.4 Microstructure The mic
28、rostructure of the compacts shall be alpha and beta phases. The alpha phase may have different shapes such as acicular or lamellar, plate-like, equiaxed, serrated or Widmansttten (basketweave). A continuous network of alpha in prior beta grain boundaries is acceptable. In additon, the microstructure
29、 shall be homogeneous and free from inclusions, alloy segregation, laminations, and alpha case. Compacts shall also be free from interconnecting voids, porosity in excess of 0.010 inch (0.25 mm) in maximum dimension, and linear porosity in excess of 0.006 inch (0.15 mm) in maximum dimension. 3.4.4.1
30、 Microstructure and porosity shall be determined by metallographic examination at 100 to 500X magnification except 400 to 500X magnification shall be used for alpha case, after suitably polishing, or polishing and etching, as appropriate. Adjacent pores shall be treated as a single pore if they are
31、closer to each other than the largest pore maximum dimension. Porosity whose length is more than three times its width shall be considered linear porosity. 3.5 Quality Sintered compacts, as received by purchaser, shall be uniform in quality and condition, clean, and free of defects such as cracks, s
32、eams, grooves, laminations, pits, inclusions, and surface oxidation and from other imperfections detrimental to their usage. 3.5.1 Sintered compacts shall be free from cracks, porosity, and other surface imperfections, determined by fluorescent penetrant inspection in accordance with ASTM E1417/E141
33、7M using AMS2644 Type 1 Level 3 penetrant. 3.5.2 Sintered compacts shall be free from low- and high-density inclusions and inhomogeneity, determined by radiographic inspection in accordance with ASTM E1742/E1742M. 3.5.3 Surface texture of sintered compacts shall not exceed 125 in (3.2 m), determined
34、 in accordance with ANSI B46.1. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of sintered compacts 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 a
35、ny confirmatory testing deemed necessary to ensure that the sintered compacts conform to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests The following requirements are acceptance tests and shall be performed as specified in 4.2.1.1 and 4.2.1.2: 4.2.1.1 Powder Lot On each p
36、owder lot prior to use for production of sintered compacts: 4.2.1.1.1 Composition (3.1). 4.2.1.1.2 Blend uniformity check analysis on aluminum and vanadium contents (3.1.1). 4.2.1.1.3 Tensile properties (3.4.1). 4.2.1.1.4 Density (3.4.3). 4.2.1.1.5 Microstructure (3.4.4). SAE INTERNATIONAL AMS4993F
37、Page 6 of 9 4.2.1.2 Part Lot On each lot of sintered compacts from each sinter run: 4.2.1.2.1 Composition (3.1). 4.2.1.2.2 Tensile properties (3.4.1). 4.2.1.2.3 Proof test (3.4.2), density (3.4.3), and quality (3.5). 4.2.1.2.4 Microstructure (3.4.4). 4.2.2 Preproduction Tests All technical requireme
38、nts are preproduction tests and shall be performed prior to or on the first-article shipment of sintered compacts to a purchaser, when a change in ingredients and/or processing requires approval by the cognizant engineering organization (see 4.4.2), and when purchaser deems confirmatory testing to b
39、e required. 4.3 Sampling and Testing Shall be in accordance with 4.3.1 and 4.3.2. A powder lot shall be all powder blended from the same batches of titanium and aluminum-vanadium powders in a single blending operation; a lot of sintered compacts shall be all sintered compacts of the same configurati
40、on produced from one powder lot in one production run using the same equipment and processing procedures in one sinter furnace load and presented for producers inspection at one time. 4.3.1 For Acceptance Tests 4.3.1.1 Powder Lot 4.3.1.1.1 One pressed and sintered test specimen for composition. 4.3.
41、1.1.2 Three pressed and sintered specimens taken from three different locations in the blend for aluminum and vanadium uniformity checks. 4.3.1.1.3 Twelve pressed and sintered test specimens for tensile properties and density. 4.3.1.1.4 Two pressed and sintered test specimens for microstructure. 4.3
42、.1.2 Part Lot 4.3.1.2.1 One sintered compact for composition. 4.3.1.2.2 One pressed and sintered test specimen for tensile properties. 4.3.1.2.3 Sintered compacts as specified in Table 5, selected at random from the lot, for proof tests, density, and quality. SAE INTERNATIONAL AMS4993F Page 7 of 9 T
43、able 5 - Sampling for proof test, density, and quality Number of Inspection Units in the Lot Proof Test (3.4.2) and Density (3.4.3) Quality (3.5) Up to 99 2 4 100 to 299 3 6 300 to 599 4 8 600 to 999 5 10 1000 to 1499 6 12 1500 to 1999 7 14 2000 to 2999 8 16 3000 to 3999 9 18 4000 to 5999 10 20 6000
44、 to 10000 12 24 Over 10000 15 30 4.3.1.2.4 One sintered compact for microstructure. 4.3.2 For Preproduction Tests As agreed upon by purchaser and producer. 4.4 Approval 4.4.1 The producer of compacts shall establish a written process description of manufacture and inspection for each product number
45、prior to and during preproduction. The description shall include control factors and parameters that provide products meeting the requirements of this specification. Control factors considered proprietary by producer may be assigned codes within the process description. Each variation in such contro
46、l factors shall be assigned a modified code designation. The producer shall maintain a complete record of all proprietary factors and codes. These control factors shall include, but are not limited to, the following: Powder source(s) Blending method Powder storage, identification, and handling proce
47、dures Compaction sequence and parameters, including atmosphere, time, temperature, and pressure Type of sintering furnace Furnace calibration and leak-up rate Size of furnace charge Sintering sequence and parameters, including atmosphere, time, and temperature Material on which the pressed compacts
48、rest during sintering Whether re-sintering is permitted Cleaning procedures and parameters Inspection procedures, parameters, and standards 4.4.2 Prior to the initial shipment of compacts of a particular design, the supplier shall submit results of preproduction tests and, when requested, a copy of
49、the process description for approval. Proof or failure test procedure (see 3.4.2), correlation with tensile properties, and acceptance limits shall be approved by the cognizant engineering organization. 4.4.3 The supplier shall not change the process description and shall make no significant change to materials, processes, or controls referenced in the process description, unless the change is approved by the
