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 2014 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/AMS6946CAEROSPACE MATERIAL SPECIFICATIONAMS6946 REV. CIssued 2006-10Revised 2014-04Supersedin
5、g AMS6946BTitanium Alloy, Sheet, Strip, and Plate4Al - 2.5V - 1.5FeAnnealed(Composition similar to UNS R54250)RATIONALEAMS6946B results from a Five Year Review and update of this specification that restricts the sizes covered (1.1), revises melting to ensure VAR of subsequent melts, requires ultraso
6、nic testing of all plate 0.500 inch (12.70 mm) and over (3.6.1), includes the addition of AS6279 (3.8) and AMS2368 (4.3) and revises the report paragraph (4.4).1. SCOPE1.1 FormThis specification covers a titanium alloy in the form of sheet, strip, and plate 0.020 inch (0.50 mm) through 2.10 inches (
7、53.3 mm), inclusive, in nominal thickness.1.2 ApplicationThese products have been used typically for parts requiring strength up to 750 F (400 C), weldability, ductility and cold formability, superplastic forming capability, but usage is not limited to such applications.2. APPLICABLE DOCUMENTSThe is
8、sue 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 been cancelled an
9、d 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, or www.sae.org.AMS2242
10、Tolerances, Corrosion and Heat Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Sheet, Strip, and PlateAMS2249 Chemical Check Analysis Limits, Titanium and Titanium AlloysAMS2368 Sampling and Testing of Wrought Titanium Raw Material Except Forgings and Forging StockSAE INTERNATIONAL AMS6946
11、C Page 2 of 7AMS2630 Inspection, Ultrasonic Product Over 0.5 inch (12.7 mm) ThickAMS2750 PyrometryAMS2809 Identification, Titanium and Titanium Alloy Wrought ProductsAS6279 Industry Standard Practices for Production, Distribution, and Procurement of Metal Stock2.2 ASTM PublicationsAvailable from AST
12、M International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, or www.astm.org.ASTM E 8 / E 8M Tension Testing of Metallic MaterialsASTM E 290 Bend Testing of Material for DuctilityASTM E 384 Knoop and Vickers Hardness of MaterialsASTM E 1409 Determinatio
13、n 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/Infrared Detection MethodASTM E 1941 Determination of Carbon in Refractory and Reactive Metals
14、and Their Alloys by Combustion AnalysisASTM E 2371 Analysis of Titanium and Titanium Alloys by Direct Current Plasma and Inductively Coupled Atomic Emission Spectrometry3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight shown in Table 1; carbon shall be determined in
15、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 be used if acceptable to the purchaser.TABLE 1 - COMPOSITIONElement min maxAluminumVanadiumIronOxy
16、genCarbonNitrogenHydrogenOther Elements, each (3.1.1)Other Elements, total (3.1.1)Titanium3.52.01.20.20-remainder4.53.01.80.300.080.030.0150.100.30 (800 ppm)(300 ppm)(150 ppm)3.1.1 Determination not required for routine acceptance.3.1.2 Check AnalysisComposition variations shall meet the applicable
17、requirements of AMS2249.SAE INTERNATIONAL AMS6946C Page 3 of 73.2 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
18、melts shall 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 nonconsumable electrode melting shall be vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercury.3.
19、2.1.2 The electrode tip for nonconsumable electrode melting shall be water cooled copper.3.3 ConditionThe product shall be supplied in one of the following conditions:3.3.1 Sheet or strip hot rolled to an intermediate stage, finished to nominal size by cold reduction, and annealed. Product shall be
20、leveled and pickled, as required, and have surface appearance comparable to a commercial corrosion-resistant steel 2D, 2B, or bright anneal finish (See 8.2).3.3.2 Plate or sheet hot rolled, annealed, descaled, and flattened, having a surface appearance comparable to a commercial corrosion resistant
21、steel No. 1 finish (See 8.2). Plate product shall be produced using standard industry practices designed strictly for the production of plate stock to procured thickness. Bar, billet, forgings, or forging stock shall not be supplied in lieu of plate.3.4 AnnealingThe product shall be annealed by heat
22、ing to a temperature within the range 1300 to 1500 F (705 to 815 C), holding at the selected temperature 25 F (14 C) for a time commensurate with product thickness, and heating equipment and procedure used, and cooling at a rate that will produce product meeting the requirements of 3.5. Pyrometry sh
23、all be in accordance with AMS2750.3.5 PropertiesThe product, as furnished, shall conform to the requirements of 3.5.1, 3.5.2, 3.5.3, and 3.5.4. Product shall also meet the requirements of 3.5.1 and 3.5.2 after being heated in air to 1325 F 25 (720 C 14), held at heat for 20 minutes 2, cooled at a ra
24、te equivalent to an air cool or slower, and descaled:3.5.1 Tensile PropertiesShall be as specified in Table 2 on product 0.020 to 2.10 inches (0.50 to 53.3 mm), inclusive, in nominal thickness, determined in accordance with ASTM E 8 / E 8M with the rate of strain set at 0.005 inch/inch/minute (0.005
25、 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. TABLE 2A - MINIMUM TENSILE PROPERTIES, INCH/POUND UNITS Nominal Thickness InchesTensile StrengthksiYield Strengthat 0.2% OffsetksiElongationin 2 inches or 4D%LLT L LT
26、LLTCold Rolled0.020 to 0.156, incl 134 139 112 129 10 10Hot Rolled0.125 to 2.10, incl 131 131 118 118 12 12SAE INTERNATIONAL AMS6946C Page 4 of 7TABLE 2B - MINIMUM TENSILE PROPERTIES, SI UNITS Nominal Thickness MillimetersTensile StrengthMPaYield Strengthat 0.2% OffsetMPaElongationin 50.8 mm or 4D%L
27、LT L LTLLTCold Rolled0.508 to 3.96, incl 924 958 772 889 10 10Hot Rolled3.20 to 53.4, incl 903 903 814 814 12 123.5.1.1 Mechanical property requirements for product outside the range covered by Table 2 shall be agreed upon between purchaser and producer3.5.2 BendingProduct under 0.1875 inch (4.762 m
28、m) 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 at room temperature in conformance with the guided bend test defined in ASTM E 290 through an angle of 1
29、05 degrees. The test fixture supports shall have a contact radius 0.010 inch (0.25 mm) 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 25X mag
30、nification.TABLE 3 - BEND FACTORNominal ThicknessInchNominal ThicknessMillimetersBendFactorUp to 0.1875, excl Up to 4.76, excl 43.5.3 MicrostructureShall be that structure resulting from alpha-beta processing. Microstructure shall conform to 3.5.3.1, or 3.5.3.2, or 3.5.3.3, or 3.5.3.4. A microstruct
31、ure showing a continuous network of alpha in prior beta grain boundaries is not acceptable.3.5.3.1 Lamellar alpha with some equiaxed alpha in a transformed beta matrix.3.5.3.2 Equiaxed alpha in a transformed beta matrix.3.5.3.3 Equiaxed alpha and elongated alpha in a transformed beta matrix.3.5.3.4
32、Partially broken and distorted grain boundary alpha with plate-like alpha.3.5.4 Surface Contamination The product shall be free of any oxygen-rich layer, such as alpha case, or other surface contamination, determined as in 3.5.4.1, 3.5.4.2, 3.5.4.3, or other method acceptable to purchaser.3.5.4.1 Th
33、e bend test of 3.5.2.3.5.4.2 Microscopic examination at 400X minimum.3.5.4.3 Hardness differential; a surface hardness more than 40 points higher than the subsurface hardness, determined in accordance with ASTM E 384 on the Knoop scale using a 200 gram load, being evidence of unacceptable surface co
34、ntamination.3.5.4.4 In case of dispute, the method of 3.5.4.3 shall apply.SAE INTERNATIONAL AMS6946C Page 5 of 73.6 QualityThe product, as received by purchaser, shall be uniform in quality and condition, sound, and free from “oil cans“ (See 8.3.1) of depth in excess of the flatness tolerance, rippl
35、es, and foreign materials and from imperfections detrimental to usage of the product.3.6.1 Plate 0.500 inch (12.70 mm) and over in thickness shall be ultrasonically inspected in accordance with AMS2630, Quality Class A, when specified in Purchase Documents (See 8.6).3.7 Tolerances3.7.1 Shall conform
36、 to all applicable requirements of AMS2242.3.7.2 Flatness tolerances do not apply to coiled products.3.7.3 Special flatness may be specified for plate, in which case the special flatness tolerances of AMS2242 apply.3.8 Production, distribution, and procurement of metal stock shall comply with AS6279
37、. 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 be responsible for the performance of all required tests. Purchaser reserves the right to sample and to
38、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), condition (3.3), tensile properties (3.5.1), bending (3.5.2), microstructure (3.5.3), surface contamination (3.5.4), qua
39、lity (3.6), and tolerances (3.7) are acceptance tests and shall be performed on each heat or lot as applicable.4.2.1.1 When specified, ultrasonic quality (3.6.1) of each plate.4.2.2 Periodic TestsThe following requirements are periodic tests and shall be performed at a frequency selected by the vend
40、or unless frequency of testing is specified by purchaser:4.2.2.1 Surface contamination, as determined by 3.5.4.2 and 3.5.4.3.4.2.2.2 Tensile (3.5.1) and bending (3.5.2) properties of product after reheating to 1325 F 25 (720 C 14).4.3 Sampling and TestingShall be in accordance with AMS2368 and the f
41、ollowing; 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 CompositionOne sample from each heat, except that for hydrogen determinations one sample from each lot obtained after thermal and chemical processing are comp
42、leted.SAE INTERNATIONAL AMS6946C Page 6 of 74.3.1.2 Tensile Property, Bending, Microstructure, and Surface Contamination RequirementsOne or more samples from each lot for each requirement.4.3.1.2.1 Specimens for tensile from widths 9 inches (229 mm) and over shall be taken with the axis of the speci
43、men perpendicular to the direction of rolling; for widths under 9 inches (229 mm); specimens shall be taken with the axis parallel to the direction of rolling. 4.3.2 For Periodic TestsAs selected by the vendor to ensure conformance, unless specified by purchaser.4.4 Reports4.4.1 The producer shall p
44、rovide with each shipment a report showing 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 and bending properties, surface c
45、ontamination of each lot, and ultrasonic inspection (when specified) and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot number, AMS6946C, size, product form, specific annealing treatment used, and quantity,4.4.
46、2 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 RetestingIf any specimen used in the above tests fails to meet the specified requirements, disposition of the product may be based on the results of testing three a
47、dditional 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 IdentificationIn accordance with AMS2809.5.2
48、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 acceptance and safe delivery.6. ACKNOWLEDGMENTA vendor shall i
49、nclude 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 rejection.8. NOTES8.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been
