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 theref
2、rom, 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 2015 SAE InternationalAll rights reserved. No part of this publi
3、cation 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 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS4990CAEROSPACEMATERIAL SPECIFICATIONAMS4990 REV. CIssued 2003-04Revised 2015-12Superseding
5、 AMS4990BTitanium Alloy Sheet, Strip, and Plate6Al -6V -2SnSolution Heat Treated and Aged(Composition Similar to UNS R56620)RATIONALEAMS4990C results from an update of this specification that removes the weight allowance for hydrogen (covered by ASTM E1447) and the grain size requirement, adds AS627
6、9 and revises reporting.1. SCOPE1.1 FormThis specification covers a titanium alloy in the form of sheet, strip, and plate up through 4 inches (101.6 mm).1.2 ApplicationThis material is typically used for parts requiring high strength-to-weight ratio and stability up to 550 F (288 C), but usage is no
7、t 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 minimize such conditions.2. APPLICABLE DOCUMENTSThe issue of the following documents in effect on the date
8、 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 document has been cancelled and no superseding document has been specified, the la
9、st published issue of that document shall apply.2.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org.AMS2242 Tolerances, Corrosion and Heat Resistant Steel, Iro
10、n Alloy, Titanium, and Titanium Alloy Sheet, Strip, and PlateAMS2249 Chemical Check Analysis Limits, Titanium and Titanium AlloysSAE INTERNATIONAL AMS4990C Page 2 of 7AMS2631 Ultrasonic Inspection, Titanium and Titanium Alloy Bar, Billet and PlateAMS2750 PyrometryAMS2809 Identification, Titanium and
11、 Titanium Alloy Wrought ProductsARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy ProductsAS6279 Industry Standard Practices for Production, Distribution, and Procurement of Metal Stock2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, W
12、est Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM E8/E8M Tension Testing of Metallic MaterialsASTM E290 Bend Testing of Material for DuctilityASTM E384 Knoop and Vickers Hardness of MaterialsASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the In
13、ert Gas Fusion TechniqueASTM E1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal Conductivity/Infrared Detection MethodASTM E1941 Determination of Carbon in Refractory and Reactive Metals and Their AlloysASTM E2371 Analysis of Titanium and Titanium Alloys
14、by Direct Current Plasma and Inductively Coupled Atomic Emission Plasma Spectrometry3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight shown in Table 1; carbon shall be determined in accordance with ASTM E1941, hydrogen in accordance with ASTM E1447, oxygen and nitrog
15、en in accordance with ASTM E1409, and other elements in accordance with ASTM E2371. Other analytical methods may be used if acceptable to the purchaser.Table 1 - CompositionElement min maxAluminum 5.00 6.00Vanadium 5.00 6.00Tin 1.50 2.50Iron 0.35 1.00Copper 0.35 1.00Oxygen - 0.20Carbon - 0.05Nitroge
16、n - 0.04 (400 ppm)Hydrogen - 0.015 (150 ppm)Yttrium (3.1.1) - 0.005 ( 50 ppm)Other Elements each (3.1.1) - 0.10Other Elements, total (3.1.1) - 0.40Titanium remainderSAE INTERNATIONAL AMS4990C Page 3 of 73.1.1 Determination not required for routine acceptance.3.1.2 Check AnalysisComposition variation
17、s shall meet the applicable requirements of AMS2249.3.2 Melting Practice3.2.1 Alloy shall be multiple melted. The first melt shall be made by vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice. The subsequent melt or melts shal
18、l be made under vacuum using vacuum arc remelting (VAR) practice. Alloy additions are not permitted in the final VAR melt.3.2.1.1 The atmosphere for non-consumable electrode melting shall be vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercury.3.2.1.2 The
19、 electrode tip for nonconsumable electrode melting shall be water-cooled copper.3.3 ConditionThe product shall be supplied in the following condition:3.3.1 Sheet and StripHot rolled, with or without subsequent cold reduction, solution heat treated, descaled, leveled, and precipitation hardened, havi
20、ng a surface appearance comparable to a commercial corrosion-resistant steel No. 2D finish (see 8.3).3.3.2 PlateHot rolled, solution heat treated, flattened, and aged, having a surface appearance comparable to a commercial corrosion-resistant steel No. 1 finish (see 8.3). Plate product shall be prod
21、uced using standard industry practices designed strictly for the production of plate stock to the procured thickness. Bar, billet, extrusions, forgings, or forging stock shall not be supplied in lieu of plate.3.4 Heat TreatmentThe product shall be solution heat treated by heating to a temperature 15
22、50 to 1700 F (843 to 927 C) holding at the selected temperature within 25 F (14 C) for 2 to 60 minutes, and cooling at a rate equivalent to an air cool or faster and aged by heating to 875 to 1150 F 15 F (468 to 621 C 8 C), holding at heat for 2 to 10 hours, and cooling in air. Pyrometry shall be in
23、 accordance with AMS2750.3.5 PropertiesProduct shall conform to the following requirements:3.5.1 Tensile PropertiesShall be as specified in Table 2, determined in accordance with ASTM E8/E8M with the rate of strain set at 0.005 inch/inch/minute (0.005 mm/mm/minute) and maintained within a tolerance
24、of 0.002 inch/inch/minute (0.002 mm/mm/minute) through the 0.2% offset yield strain.SAE INTERNATIONAL AMS4990C Page 4 of 7Table 2A - Minimum tensile properties (see 8.2)Nominal ThicknessInchesTensile StrengthksiYield Strengthat 0.2% OffsetksiElongationin 2 inches or 4D%Up to 0.1875, excl 170 160 8 (
25、6) (3.5.1.1)0.1875 to 1.500, excl 170 160 81.500 to 2.500, excl 160 150 62.500 to 4.000, incl 150 140 6Table 2B - Minimum tensile properties, SI units (see 8.2)Nominal ThicknessMillimetersTensile StrengthMPaYield Strengthat 0.2% OffsetMPaElongationin 50.8 mm or 4D%Up to 4.76, excl 1172 1103 8 (6) (3
26、.5.1.1)4.76 to 38.10, excl 1172 1103 838.10 to 63.50, excl 1103 1034 663.50 to 101.60, incl 1034 965 63.5.1.1 Elongation value in parentheses is for transverse direction only.3.5.1.2 Mechanical property requirements for product outside of the range covered by Table 2 shall be agreed upon between pur
27、chaser and producer.3.5.2 MicrostructureShall be that structure resulting from processing within the alpha-beta phase field. Microstructure shall conform to 3.5.2.1 or 3.5.2.2 (see 8.5).3.5.2.1 Equiaxed and/or elongated primary alpha in a transformed beta matrix with no continuous network of alpha a
28、t prior beta grain boundaries.3.5.2.2 Essentially complete field of equiaxed and/or elongated alpha with or without intergranular beta and with no continuous network of alpha at prior beta grain boundaries.3.5.2.3 A microstructure showing a continuous network of alpha in prior beta grain boundaries
29、is not acceptable.3.5.3 Surface ContaminationThe product shall be free of any oxygen-rich layer, such as alpha case, or other surface contamination, determined as in 3.5.3.1 or 3.5.3.2, or other method acceptable to purchaser.3.5.3.1 Microscopic examination at 400X minimum.3.5.3.2 Hardness differenc
30、e; a surface hardness more than 40 points higher than the subsurface hardness, determined in accordance with ASTM E384 on the Knoop scale using a 200 gram load, being evidence of unacceptable surface contamination.SAE INTERNATIONAL AMS4990C Page 5 of 73.6 QualityThe product, as received by purchaser
31、, shall be uniform in quality and condition, sound, and free from “oil cans” (see 8.4) of depth in excess of the flatness tolerances, ripples, and foreign materials and from imperfections detrimental to usage of the product.3.6.1 Ultrasonic InspectionPlate 0.500 inch (12.70 mm) and over in nominal t
32、hickness shall meet Class A1 requirements of AMS2631.3.7 TolerancesShall conform to all applicable requirements of AMS2242.3.8 Production, distribution, and procurement of metal stock shall comply with AS6279. This requirement becomes effective January 1, 2017.4. QUALITY ASSURANCE PROVISIONS4.1 Resp
33、onsibility for InspectionThe producer of the product 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 any confirmatory testing deemed necessary to ensure that the product conforms to
34、 specified requirements.4.2 Classification of TestsTests for all technical requirements are acceptance tests and shall be performed on each heat or lot as applicable.4.3 Sampling and TestingShall be in accordance with the following; a lot shall be all product of the same nominal size from the same h
35、eat processed at the same time and in the same heat treatment batch.4.3.1 CompositionOne sample from each heat, except that for hydrogen determinations one sample from each lot obtained after thermal and chemical processing is completed.4.3.2 Tensile Properties, Microstructure and Surface Contaminat
36、ion At least one sample from each lot.4.3.2.1 Specimens for tensile tests of widths 9 inches (229 mm) and over shall be taken in both the longitudinal and transverse directions; for widths under 9 inches (229 mm), specimens shall be taken in the longitudinal direction.4.4 Reports4.4.1 The producer s
37、hall furnish with each shipment a report showing the producer identity, country where the metal was melted (i.e., final melt in the case of metal processed by multiple melting operations), the results of tests for composition of each heat and for the hydrogen content, tensile properties, surface con
38、tamination and ultrasonic quality (if applicable) of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS4990C, specific solution heat and aging treatment use, product form, size, and quant
39、ity.4.4.2 When the product size is outside the range covered by Table 2, the report shall contain a statement to that effect.SAE INTERNATIONAL AMS4990C Page 6 of 74.5 Resampling and RetestingIf any specimen used in the above tests fails to meet the specified requirements, disposition of the product
40、may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the product represented. Results of all tests shall be reported.5. PREPARATION FOR DELIVERY5.1
41、 IdentificationShall be in accordance with AMS2809.5.2 PackagingThe product shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the product to ensure carrier accepta
42、nce and safe delivery.6. ACKNOWLEDGMENTA producer shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONSProduct not conforming to this specification, or to modifications authorized by purchaser, will be subject to reject
43、ion.8. NOTES8.1 Revision IndicatorA change bar (l) located in the left margin is for the convenience of the user in locating areas where technical 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 comp
44、lete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.8.2 These mechanical properties for product up through 4.00 inches (101.60 mm) were taken from MIL-T-9046 and have not been su
45、bstantiated by AMS statistical procedures.8.3 Commercial corrosion-resistant steel finishes are defined in ASTM A480/A480M and AS4194.8.4 Terms used in AMS are clarified in ARP1917 and as follows:8.4.1 Oil CanAn excess of material in a localized area of a sheet that causes the sheet to buckle in tha
46、t area. When the sheet is placed on a flat surface and hand pressure applied to the buckle, the buckle will spring through to the opposite surface or spring up in another area of the sheet.8.5 Terminology relating to titanium microstructures is presented in AS1814.8.6 Dimensions and properties in in
47、ch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information.SAE INTERNATIONAL AMS4990C Page 7 of 78.7 Purchase documents should spec
48、ify not less than the following:AMS4990CProduct form and size of product desiredQuantity of product desiredProperty and acceptance requirements from the cognizant engineering organization applicable to sizes outside the range listed in 1.1.8.8 Similar SpecificationsAMS-T-9046 and MIL-T-9046, Type III, Composition E (AB-3).PREPARED BY AMS COMMITTEE “G”
