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/AMS6905BAEROSPACE MATERIAL SPECIFICATIONAMS6905 REV. BIssued 2004-01Revised 2014-03Supersedin
5、g AMS6905ATitanium Alloy Bars, Forgings and Forging Stock6.0Al - 2.0Sn - 4.0Zr - 2.0MoDuplex Annealed(Composition similar to UNS R54620)RATIONALEAMS6905B results from an update of this specification that revises the hydrogen content to that of AMS4975 and AMS4976 in Table 1, requires vacuum in the f
6、irst consumable electrode melt (3.2) and agreement on mechanical property values for material outside specification ranges (3.5.1.1.5 and 8.7), adds AS6279 (3.8) and revises the report paragraph (4.4).1. SCOPE1.1 FormThis specification covers a titanium alloy in the form of barsand forgings up throu
7、gh 3.000 inches (76.20 mm), inclusive, in diameter or least distance between parallel sides with a maximum cross-sectional area of 10 square inches (64.5 cm2), and forging stock of any size (See 8.7).1.2 ApplicationThese products have been used typically for parts requiring high strength and toughne
8、ss and good creep resistance up to 1000 F (538 C), 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 minimize such conditions.2. APPLICABLE D
9、OCUMENTSThe 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 referenced document has bee
10、n 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 (outside USA), www.sae.
11、org.AMS2241 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Bars and WireAMS2249 Chemical Check Analysis Limits, Titanium and Titanium AlloysSAE INTERNATIONAL AMS6905B Page 2 of 7AMS2368 Sampling and Testing of Wrought Titanium Raw Material Except Forgings an
12、d Forging StockAMS2631 Ultrasonic Inspection, Titanium and Titanium Alloy Bar and Billet AMS2643 Structural Examination of Titanium Alloys, Chemical Etch Inspection AMS2750 PyrometryAMS2808 Identification, ForgingsAMS2809 Identification, Titanium and Titanium Alloy Wrought ProductsARP982 Minimizing
13、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, West Conshohocken, PA 19428-2959, Tel: 610-832-9585
14、, www.astm.org.ASTM E 8 / E 8M Tension Testing of Metallic MaterialsASTM 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 Fusion Thermal Conductivity/Inf
15、rared 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 Plasma Atomic Emission Spectrometry3. TECHNICAL REQUIREMENTS3.1 Com
16、positionShall 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 2371. Other analytical methods may
17、 be used if acceptable to the purchaser.TABLE 1 - COMPOSITIONElement min maxAluminum 5.50 6.50Zirconium 3.60 4.40Molybdenum 1.80 2.20Tin 1.80 2.20Silicon - 0.13Iron - 0.25Oxygen - 0.15Carbon - 0.05Nitrogen - 0.04 (400 ppm)Hydrogen (3.1.2) - 0.0125 (125 ppm)Yttrium (3.1.1) - 0.005 ( 50 ppm)Other Elem
18、ents each (3.1.1) - 0.10Other Elements, total (3.1.1) - 0.30Titanium remainderSAE INTERNATIONAL AMS6905B Page 3 of 73.1.1 Determination not required for routine acceptance.3.1.2 When using ASTM E 1447 for hydrogen determination, sample size may be as large as 0.35 gram.3.1.3 Check AnalysisCompositio
19、n variations shall meet the applicable requirements of AMS2249.3.2 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 melting practice. The subsequent melt or melts
20、 shall be made under vacuum using vacuum arc remelting (VAR) practice. Alloy additions are not permitted in the final melt cycle.3.2.1 The atmosphere for nonconsumable electrode melting shall be vacuum or shall be argon or helium at an absolute pressure not higher than 1000 mm of mercury.3.2.2 The e
21、lectrode tip for nonconsumable electrode melting shall be water-cooled copper.3.3 ConditionThe product shall be supplied in the following condition:3.3.1 BarsHot finished with or without subsequent cold reduction, duplex annealed, and descaled. A machined or ground surface is permitted unless prohib
22、ited by purchaser. The product shall be processed to the final thickness/diameter by metallurgical working operations prior to any straightening, dimensional sizing or surface finishing operations. Bar shall not be cut from plate.3.3.2 ForgingsDuplex annealed and descaled.3.3.3 Stock for ForgingAs o
23、rdered by the forging manufacturer.3.4 Heat TreatmentBars and forgings shall be duplex annealed as follows; pyrometry shall be in accordance with AMS2750.3.4.1 Solution Heat TreatmentHeat to a temperature 25 to 50 F (14 to 28 C) degrees below the beta transus, determined on each heat of alloy, hold
24、at the selected temperature within 15 F (8 C) for a time commensurate with section thickness and the heating equipment and procedure used, and cool at a rate equivalent to an air cool or faster.3.4.1.1 Beta transus may be determined metallographically or by a differential thermal analyzer.3.4.2 Stab
25、ilization Heat TreatmentHeat to 1100 F 25 (595 C 14); hold for not less than 8 hours, and cool at a rate equivalent to air cooling.3.5 PropertiesThe product shall conform to the following requirements:SAE INTERNATIONAL AMS6905B Page 4 of 73.5.1 Bars and Forgings3.5.1.1 Tensile PropertiesShall be as
26、specified 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 (0.002 mm/mm/minute) through the 0.2% offset yield strain. 3.5.1.1.1 Tensile property requirement
27、s apply in both the longitudinal and transverse directions. Transverse tensile properties of Table 2 apply only to product that a test specimen not less than 2.50 inches (63.5 mm) in length can be obtained.3.5.1.1.2 Specimens for the longitudinal requirements in Table 2 shall be taken with the axis
28、of the specimen within 15 degrees of parallel to the grain flow.3.5.1.1.3 Yield strength and reduction of area requirements do not apply to product under 0.125 inch (3.18 mm) in nominal diameter.3.5.1.1.4 Where short transverse properties are determined, long transverse properties do not need to be
29、determined.TABLE 2 - MINIMUM TENSILE PROPERTIES (SEE 8.2)Nominal Diameter or Least Distance Between Parallel SidesInch (mm)Maximum Cross Sectional AreaSquare Inches(cm2)TensileStrengthksi (MPa)Yield StrengthAt 0.2% Offsetksi (MPa)Elongation in2 Inches (50.8 mm) or 4D, %Reduction of Area%Up to 3.00 (
30、76.2), incl. 10 (64.5) 130 (896) 120 (827) 10 253.5.1.1.5 Mechanical property requirements for product outside the size range covered by Table 2 shall be agreed upon between purchaser and producer.3.5.1.2 MicrostructureShall be that structure resulting from processing within the alpha-beta phase fie
31、ld. Microstructure shall conform to 3.5.1.2.1 or 3.5.1.2.2 (See 8.3).3.5.1.2.1 Equiaxed and/or elongated primary alpha in a transformed beta matrix with no continuous network of alpha at prior beta grain boundaries.3.5.1.2.2 Essentially complete field of equiaxed and/or elongated alpha with or witho
32、ut intergranular beta and with no continuous network of alpha at prior beta grain boundaries.3.5.1.3 Surface ContaminationExcept as specified in 3.5.1.3.1, the product shall be free of any oxygen-rich layer (See 8.4), such as alpha case, or other surface contamination, determined by microscopic exam
33、ination at not lower than 400X magnification or by other method agreed upon by purchaser and vendor.3.5.1.3.1 When permitted by purchaser, product to be machined all over may have an oxygen-rich layer, provided such layer is removable within the machining allowance on the product.3.5.1.4 Macrostruct
34、ureProduct shall be uniform in quality and condition, homogenous, sound, and free from foreign materials and from internal imperfections detrimental to fabrication or performance of parts.SAE INTERNATIONAL AMS6905B Page 5 of 73.5.2 Forging StockWhen a sample of stock is forged to a test coupon and h
35、eat treated as in 3.4, specimens taken from the heat treated coupon shall conform to the requirements of 3.5.1.1. If specimens taken from the stock after heat treatment as in 3.4 conform to the requirements of 3.5.1.1, the tests shall be accepted as equivalent to tests of a forged coupon.3.6 Quality
36、The product, 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 product.3.6.1 Ultrasonic InspectionProduct 0.500 inch (12.70 mm) to 1.500 inches (38.10 mm) inclusive in nominal thickness, diam
37、eter or least distance between parallel sides shall meet Class A1 requirements of AMS2631. Product over 1.500 inches (38.10 mm) in nominal thickness, diameter or least distance between parallel sides shall meet Class A requirements of AMS2631.3.7 TolerancesBars shall conform to all applicable requir
38、ements of AMS2241.3.8 Production, distribution, and procurement of metal stock shall comply with AS6279. This requirement becomes effective October 1, 2015.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe vendor of the product shall supply all samples for vendors tests and shall b
39、e 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 the specified requirements.4.2 Classification of Tests4.2.1 Acceptance TestsThe following requirements are a
40、cceptance tests and shall be performed on each heat or lot as applicable.4.2.1.1 Composition (3.1) of each heat.4.2.1.2 Hydrogen content (3.1), tensile properties (3.5.1.1), microstructure (3.5.1.2), surface contamination (3.5.1.3), and macrostructure (3.5.1.4) of each lot of bars and forgings.4.2.1
41、.3 Ultrasonic quality of each bar, forging or forging stock as required by 3.6.1.4.2.1.4 Tolerances (3.7) of bars.4.2.2 Periodic TestsAbility of forging stock (3.5.2) to develop specified properties is a periodic test and shall be performed at a frequency selected by the vendor unless frequency of t
42、esting is specified by purchaser.4.3 Sampling and TestingShall be in accordance with AMS2368 and as follows: A lot shall be all product of the same nominal size from the same heat processed at the same time.SAE INTERNATIONAL AMS6905B Page 6 of 74.3.1 For Acceptance Tests4.3.1.1 CompositionAt least o
43、ne sample from each heat, except that for hydrogen determinations, one sample from each lot obtained after all thermal and chemical processing is completed.4.3.1.2 Tensile PropertiesAt least one sample from bars from each lot. The number, location, and orientation of samples from each lot of forging
44、s shall be as agreed upon by purchaser and vendor.4.3.1.3 MacrostructureA specimen at least 0.5 inch (12.7 mm) long by full cross-section from each end of the bars selected for sampling shall be macrostructurally examined for conformance to the quality requirements. Unless otherwise specified, macro
45、structural examination shall be performed in accordance with AMS2643. The number of bars selected for examination shall not be less than the amounts shown in Table 3.TABLE 3 - NUMBER OF BARS SELECTED FOR MACROSTRUCTURAL EXAMINATIONNumber of Bars in Lot Number of Bars Selected1to 15 116 to 50 251 to
46、150 3151 to 500 5over 500 4 + amount shown above over 5004.4 Reports4.4.1 The producer shall furnish with each shipment a report showing producer identity, country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations) and the results of tests for
47、 chemical composition and beta transus temperature of each heat and for the hydrogen content, tensile properties, and surface contamination of each lot, ultrasonic quality and state that the product conforms to the other technical requirements. The report shall include the purchase order number, hea
48、t and lot numbers, AMS6905B, product form and mill produced size (and/or part number, if applicable), specific annealing treatment used, and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall also be included.4.4.2 Report the nominal metallurgically
49、 worked cross sectional size and the cut size, if different (See 3.3.1).4.4.3 When the product size is outside the range covered by Table 2, the report shall contain a statement to that effect.4.5 Resampling and RetestingShall be in accordance with AMS2368.5. PREPARATION FOR DELIVERY5.1 IdentificationShall be as follows:5.1.1 BarsIn accordance with AMS2809, as applicable.5.1.2 ForgingsIn accordance with AMS2808, excep
