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 2013 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/AMS4898DAEROSPACE MATERIAL SPECIFICATIONAMS4898 REV. DIssued 1996-09Revised 2014-01Supersedin
5、g AMS4898CTitanium Alloy, Sheet6Al - 2Sn - 2Zr - 2Mo - 2Cr - 0.15SiAnnealed(Composition similar to UNS R56222)RATIONALEAMS4898D results from a Five Year Review and update of this specification.1. SCOPE1.1 FormThis specification covers a titanium alloy in the form of sheet in nominal thicknesses 0.01
6、6 through 0.1874 inch (0.41 through 4.760 mm).1.2 ApplicationThis sheet has been used typically for parts requiring high strength, toughness, and fatigue strength up to 750 F (399 C), but usage is not limited to such applications. The product can be superplastically formed above 1500 F (816 C) and i
7、t can be aged after air cooling from the solution treatment or super-plastic forming temperature to increase the strength.1.2.1 Certain processing procedures and service conditions may cause this sheet to become subject to stress-corrosion cracking; ARP982 recommends practices to minimize such condi
8、tions.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 specified. When the refere
9、nced document has been cancelled and no superseding document has been specified, the last 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 724-776-4970 (o
10、utside USA), www.sae.orgAMS2242 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Sheet, Strip, and PlateAMS2368 Sampling and Testing of Wrought Titanium Raw Material, Except Forgings and Forging StockSAE INTERNATIONAL AMS4898D Page 2 of 7AMS2750 PyrometryAMS28
11、09 Identification, Titanium and Titanium Alloy Wrought ProductsARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org
12、ASTM E 8 / E 8M Tension Testing of Metallic MaterialsASTM E 290 Bend Testing Material for DuctilityASTM E 1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion TechniqueASTM E 1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas
13、Fusion Thermal Conductivity/Infrared Detection MethodASTM E 1941 Determination of Carbon in Refractory and Reactive Metals and Their Alloys by Combustion AnalysisASTM E 2371 Analysis of Titanium and Titanium Alloys by Direct Current Plasma and Inductively Coupled Atomic Emission Plasma Spectrometry3
14、. TECHNICAL REQUIREMENTS3.1 CompositionShall conform 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 237
15、1. Other analytical methods may be used if acceptable to the purchaser.TABLE 1 - COMPOSITIONElement min maxAluminumTinZirconiumMolybdenumChromiumSiliconIronOxygenCarbonNitrogenHydrogenOther Elements, each (3.1.1)Other Elements, total (3.1.1)Titanium5.251.751.751.751.750.10-remainder6.252.252.252.252
16、.250.200.150.150.080.050.0150.100.40(500 ppm)(150 ppm)3.1.1 Determination not required for routine acceptance.3.2 Melting PracticeAlloy 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
17、 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 vacuum arc remelting (VAR) melt. SAE INTERNATIONAL AMS4898D Page 3 of 73.2.1 The atmosphere for nonconsumable electrode melting shall b
18、e vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercury.3.2.2 The electrode tip for nonconsumable electrode melting shall be water-cooled copper.3.3 ConditionHot rolled, annealed, ground, and pickled. Surface appearance shall be comparable to a commercial
19、corrosion-resistant steel No. 2D finish (See 8.4).3.3.1 AnnealingHeat to a temperature within the range 1300 to 1650 F (704 to 899 C), hold at the selected temperature within 25 F (14 C) for a time commensurate with product thickness and the heating equipment and procedure used, and cool to room tem
20、perature at a rate equivalent to an air cool or faster. Pyrometry shall be in accordance with AMS2750.3.4 PropertiesThe product shall conform to the following requirements, determined in accordance with AMS2368, except tensile testing shall be determined in accordance with 3.4.1.1 and bending shall
21、be determined in accordance with 3.4.1.2.3.4.1 As Annealed3.4.1.1 Tensile PropertiesShall be as shown in Table 2, determined in accordance with ASTM E 8 / E 8M with the rate of strain set at 0.005 inch/inch/minute (0.005 mm/mm/minute) and maintained within a tolerance of 0.002 inch/inch/minute (0.00
22、2 mm/mm/minute) through the 0.2% offset yield strain. Tensile property requirements apply in both the longitudinal and transverse directions.TABLE 2A - MINIMUM TENSILE PROPERTIES, INCH/POUND UNITSNominalThicknessInchTensileStrengthksiYield Strengthat 0.2% OffsetksiElongation in2 Inches%0.016 to 0.02
23、5, inclOver 0.025 to 0.032, inclOver 0.032 to 0.080, inclOver 0.080 to 0.1874, incl1551551551551501501501505678TABLE 2B - MINIMUM TENSILE PROPERTIES, SI UNITSNominalThicknessMillimetersTensileStrengthMPaYield Strengthat 0.2% OffsetMPaElongation in50.8 Millimeters%0.41 to 0.64, inclOver 0.64 to 0.81,
24、 inclOver 0.81 to 2.03, inclOver 2.03 to 4.760, incl1069106910691069103410341034103456783.4.1.1.1 Mechanical property requirements for product thinner than the sizes covered by Tables 2 and 3 shall be agreed upon between purchaser and producer.SAE INTERNATIONAL AMS4898D Page 4 of 73.4.1.2 BendingPro
25、duct 0.1874 inch (4.76 mm) and under in nominal thickness, shall have a test sample prepared nominally 0.750 inch (19.06 mm) in width, with its axis of bending parallel to the direction of rolling. The sample shall be bend tested in conformance with the guided bend test defined in ASTM E 290 through
26、 an angle of 105 degrees. The test fixture supports shall have a contact radius 0.010 minimum, and the plunger shall have a radius equal to the bend factor shown in Table 3 times the nominal thickness. Examination of the bent sample shall not show evidence of cracking when examined at 15 to 25 X mag
27、nification.TABLE 3 - BENDING PARAMETERSNominal ThicknessinchNominal ThicknessMillimeters Bend Factor0.016 to 0.070, incl 0.41 to 1.78, incl 4.5Over 0.070 to 0.1874, incl Over 1.78 to 4.760, incl 53.4.1.3 Average Grain SizeSheet 0.125 inch (3.18 mm) and under in nominal thickness, shall have an avera
28、ge grain size of ASTM No. 10 or finer (See 8.5).3.4.1.4 MicrostructureShall be that structure resulting from processing within the alpha-beta phase field. Microstructure shall conform to 3.4.1.4.1 or 3.4.1.4.2. 3.4.1.4.1 Equiaxed and/or elongated primary alpha in a transformed beta matrix with no co
29、ntinuous network of alpha at prior beta grain boundaries.3.4.1.4.2 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.3.4.1.5 Surface ContaminationSheet shall be free of any oxygen-ri
30、ch layer, such as alpha case, or other surface contamination.3.4.2 Response to Heat TreatmentWhen specified by purchaser, sheet, 0.016 to 0.1874 inch, (0.41 to 4.760 mm), inclusive, in nominal thickness, shall meet the requirements shown in Table 4 after being solution heat treated by heating to a t
31、emperature within the range 1600 to 1700 F (871 to 927 C), holding at the selected temperature within 25 F (14 C) for 15 to 60 minutes, cooling to room temperature at a rate equivalent to an air cool or faster, followed by aging within the range of 900 to 1000 F (482 to 538 C), holding at the select
32、ed temperature within 15 F (8 C) for 8 to 12 hours (See 8.2 and 8.3), and cooling to room temperature.TABLE 4 - MINIMUM TENSILE PROPERTIESProperty ValueTensile StrengthYield Strength at 0.2% OffsetElongation in 2 Inches (50.8 mm)180 ksi (1241 MPa)160 ksi (1103 MPa)5% (See 3.4.2.1)3.4.2.1 Elongation
33、requirement applies only to sheet 0.032 inch (0.81 mm) and over in nominal thickness.3.4.2.2 Mechanical property requirements for product thinner than the sizes covered by 3.4.2 shall be agreed upon between purchaser and producer.SAE INTERNATIONAL AMS4898D Page 5 of 73.5 QualitySheet, as received by
34、 purchaser, shall be uniform in quality and condition, sound, and free from “oil canning” (See 8.6.1) ofdepth in excess of one-half of the flatness tolerances, ripples, foreign materials and from imperfections detrimental to usage of the sheet.3.6 TolerancesShall conform to all applicable requiremen
35、ts of AMS2242 except the variation in flatness, unless otherwise specified, shall not exceed one-half of the standard flatness tolerance.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe vendor of sheet shall supply all samples for vendors tests and shall be responsible for the per
36、formance 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 specified requirements.4.2 Classification of Tests4.2.1 Acceptance TestsComposition (3.1), surface appearance (3.3), tensile properti
37、es as annealed (3.4.1.1), bending (3.4.1.2), average grain size (3.4.1.3), microstructure (3.4.1.4), and tolerances (3.6) are acceptance tests and shall be performed on each heat or lot as applicable.4.2.2 Periodic TestsSurface contamination (3.4.1.5) and tensile properties after solution heat treat
38、ment and aging (3.4.2) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by the purchaser.4.3 Sampling and TestingIn accordance with AMS2368 except for the following:4.3.1 For Acceptance Tests4.3.1.1 Tensile TestsSpecimens from s
39、heet 9 inches (228 mm) and over in width shall be taken with the axis of the specimens both perpendicular and parallel to the direction of rolling.4.3.2 For Periodic TestsAs selected by the vendor, unless otherwise specified.SAE INTERNATIONAL AMS4898D Page 6 of 74.4 Reports4.4.1 The producer shall f
40、urnish with each shipment a report showing the producer identity and country where the metal was melted (i.e., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition of each heat and for the hydrogen content, tensile properties as annealed,
41、 bending, average grain size, and, when specified, tensile properties after solution and aging heat treatment for each lot, and stating that the sheet conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS4898D, specific annealing
42、 treatment used, product form, size, and quantity.4.4.2 When the product size is thinner than the sizes covered by 1.1, the report shall contain a statement to that effect.4.5 Resampling and RetestingIn accordance with AMS2368.5. PREPARATION FOR DELIVERY5.1 IdentificationIn accordance with AMS2809.5
43、.2 PackagingSheet 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 sheet to ensure carrier acceptance and safe delivery.6. ACKNOWLEDGMENTA vendor shall includ
44、e this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONSSheet not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection.8. NOTES8.1 A change bar (|) located in the left margin is f
45、or 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 complete revision of the document, including technical revisions. Change bars and (R)
46、are not used in original publications, nor in documents that contain editorial changes only.8.2 If sheet is to be used in the super plastically formed and aged or solution treated and aged condition, purchaser should determine the heat treatment parameters necessary to meet the properties shown in T
47、able 4. The properties in Table 4 are applicable to sheet that is solution heat treated and aged by the procedure reported by the producer.8.3 The recommended solution and age heat treatment is 1650 F (899 C) for 30 minutes plus 950 F (510 C) for 10 hours.8.4 Commercial corrosion-resistant steel fin
48、ishes are defined in ASTM A 480/A 480M and AS4194.8.5 Average grain size refers to the size of primary alpha grains.SAE INTERNATIONAL AMS4898D Page 7 of 78.6 Terms used in AMS are clarified in ARP1917 and as follows:8.6.1 Oil CanningAn excess of material in a localized area of a sheet that causes th
49、e sheet to buckle in that 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.8.7 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in Sl units and the Celsius temperatures are shown as the approximate
