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/AMS6907BAEROSPACEMATERIAL SPECIFICATIONAMS6907 REV. BIssued 2004-01Revised 2015-12Superseding
5、 AMS6907ATitanium Alloy Bars, Forgings and Forging Stock6.0Al - 2.0Sn - 4.0Zr - 6.0MoDuplex Annealed(Composition similar to UNS R56260)RATIONALEAMS6907B results from a Five Year Review and update of this specification that includes the removal of sample size allowance for hydrogen of Table 1 (covere
6、d by ASTM E1447), requires agreement on mechanical property values for material outside specification ranges (3.5.1.1.5 and 8.7), the addition of AS6279 (3.8) and revises the report paragraph (4.4).1. SCOPE1.1 FormThis specification covers a titanium alloy in the form of bars, forgings up through 4.
7、000 inches (101.60 mm), inclusive in nominal diameter or least distance between parallel sides and 32 in2(206.46 cm2) maximum cross sectional area, and stock for forging of any size.1.2 ApplicationThese products have been used typically for parts requiring high strength up to 1000 F (538 C), but usa
8、ge 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 DOCUMENTSThe issue of the following documents in effect on
9、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 been cancelled and no superseding document has been specified
10、, 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 +1 724-776-4970 (outside USA), www.sae.org.AMS2241 Tolerances, Corrosion and Heat-Resistant St
11、eel, Iron Alloy, Titanium, and Titanium Alloy Bars and WireSAE INTERNATIONAL AMS6907B Page 2 of 8AMS2249 Chemical Check Analysis Limits, Titanium and Titanium AlloysAMS2368 Sampling and Testing of Wrought Titanium Raw Material Except Forgings and Forging StockAMS2631 Ultrasonic Inspection, Titanium
12、and Titanium Alloy Bar, Billet and PlateAMS2643 Structural Examination of Titanium Alloys, Chemical Etch Inspection ProcedureAMS2750 PyrometryAMS2808 Identification ForgingsAMS2809 Identification, Titanium and Titanium Alloy Wrought ProductsARP982 Minimizing Stress-Corrosion Cracking in Wrought Tita
13、nium 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, www.astm.org.ASTM E8/E8M Tension Testin
14、g of Metallic MaterialsASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion TechniqueASTM E1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal Conductivity/Infrared Detection MethodASTM E1941 Determination
15、of Carbon in Refractory and Reactive Metals and Their Alloys by Combustion AnalysisASTM E2371 Analysis of Titanium and Titanium Alloys by Direct Current Plasma and Inductively Coupled PlasmaAtomic Emission Spectrometry3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight
16、 shown in Table 1; 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 accordance with ASTM E2371. Other analytical methods may be used if acceptable to the purchaser.Table 1 - Comp
17、ositionElement min maxAluminum 5.50 6.50Molybdenum 5.50 6.50Zirconium 3.60 4.40Tin 1.75 2.25Iron - 0.15Oxygen - 0.15Carbon - 0.04Nitrogen - 0.04 (400 ppm)Hydrogen - 0.0125 (125 ppm)Yttrium (3.1.1) - 0.005 ( 50 ppm)Other Elements each (3.1.1) - 0.10Other Elements, total (3.1.1) - 0.40Titanium remaind
18、erSAE INTERNATIONAL AMS6907B Page 3 of 83.1.1 Determination not required for routine acceptance.3.1.2 Check AnalysisComposition 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
19、, nonconsumable electrode, 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 melt cycle.3.2.1 The atmosphere for nonconsumable electr
20、ode 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 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 BarsHot finished wit
21、h or without subsequent cold reduction, duplex annealed, and descaled. A machined or ground surface is permitted unless prohibited by the purchaser. The product shall be processed to the final thickness/diameter by metallurgical working operations prior to any straightening, dimensional sizing or su
22、rface finishing operations. Bar shall not be cut from plate.3.3.2 ForgingsDuplex annealed and descaled.3.3.3 Stock for ForgingAs ordered 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 H
23、eat TreatmentHeat to a temperature within the range 1500 to 1675 F (816 to 913 C), hold at the selected temperature within 25 F (14 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.3.4.2 Stabilizati
24、on Heat TreatmentHeat to 1100 F 25 F (593 C 14 C), hold for 8 hours 0.25 hour, and cool at a rate equivalent to air cooling.SAE INTERNATIONAL AMS6907B Page 4 of 83.5 PropertiesThe product shall conform to the following requirements:3.5.1 Bars and Forgings3.5.1.1 Tensile PropertiesShall be as specifi
25、ed in Table 2, determined in accordance with ASTM E8/E8M with the rate of strain maintained 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 requirements app
26、ly 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 of th
27、e 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 or least distance between parallel sides.Table 2 - Minimum tensile properties (see 8.2)Nominal Diameter or Lea
28、st Distance Between Parallel SidesInch (mm)Maximum Cross Sectional AreaSquare Inches(Square cm)TensileStrengthksi (MPa)Yield StrengthAt 0.2% Offsetksi (MPa)Elongation in2 Inches (50.8 mm) or 4D, %(3.5.1.1.4)Reduction of Area%(3.5.1.1.4)Up to 2.00 ( 50.80), incl. 32(206.46)160 (1103)150 (1034)150 (10
29、34)140 ( 965)108 62520 15Over 2.00 ( 50.80) to4.00 (101.60), incl.3.5.1.1.4 Values in brackets apply to the short transverse direction for short transverse dimensions of 3.00 inches or greater. When short transverse properties are determined, long transverse properties do not need to be determined.3
30、.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 field. Microstructure shall conform to 3.5.1.2.1 or
31、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 without intergranular beta and with no continuous netw
32、ork 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 examination at not lower than 400X magnification or b
33、y other method agreed upon by purchaser and producer.SAE INTERNATIONAL AMS6907B Page 5 of 83.5.1.3.1 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 MacrostructureProduc
34、t 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.3.5.2 Forging StockWhen a sample of stock is forged to a test coupon and heat treated as in 3.4, specimens taken from the
35、 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 therequirements of 3.5.1.1, the tests shall be accepted as equivalent to tests of a forged coupon.3.6 QualityThe product, as received by purchaser, shall be
36、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, diameter or least distance between parallel sides sh
37、all 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 requirements of AMS2241.3.8 Production, distribution,
38、and procurement of metal stock shall comply with AS6279. This requirement becomes effective September 1, 2016.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe producer of the product shall supply all samples for producers tests and shall be responsible for the performance of all r
39、equired 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 acceptance tests and shall be performed on
40、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.4.2.1.3 Ultrasonic quality of each bar, forging
41、, 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 producer unless frequency of testing is specified by purchaser.SAE IN
42、TERNATIONAL AMS6907B Page 6 of 84.3 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.4.3.1 For Acceptance Tests4.3.1.1 CompositionAt least one sample from each heat, except that f
43、or 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 forgings shall be as agreed upon by purchaser
44、and producer.4.3.1.3 A specimen at least 0.5 inch (6.3 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, macrostructural examination shall be performed in accorda
45、nce 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 150 3151 to 500 5over 500 4 + amount shown above ove
46、r 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 chemical composition of each heat and for the hydro
47、gen content, tensile properties, microstructure, 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, heat and lot numbers, AMS6907B, product form, mill produced size (an
48、d/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 worked cross sectional size and the cut size, if different (see 3.3
49、.1).4.4.3 When the bar and forging 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.SAE INTERNATIONAL AMS6907B Page 7 of 85. PREPARATION FOR DELIVERY5.1 IdentificationShall be as follows:5.1.1 BarsIn accordance with AMS2809, as applicable.5.1.2 ForgingsIn accordance with AMS2808, except tha
