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 ther
2、efrom, 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 2017 SAE International All rights reserved. No part of this
3、publication 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: +1 724-776-49
4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AMS6951 AEROSPACE MATERIAL SPECIFICATION AMS6951 Issued 2017-11 Titanium Alloy, Sheet 5Al - 4V
5、 - 0.75Mo - 0.5Fe Annealed (Composition similar to UNS R54100) RATIONALE AMS6951 is a new specification to cover a titanium alloy sheet. 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of sheet 0.025 through 0.100 inches (0.63 through 2.54 mm) inclusive in thickness (see 8.5
6、). 1.2 Application This material has been used typically for parts requiring strength up to 750 F (399 C) and superplastic forming capability, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms
7、 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 last published issue of that d
8、ocument shall apply. 2.1 SAE Publications Available 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, Iron Alloy, Titanium, and Tit
9、anium Alloy Sheet, Strip, and Plate AMS2249 Chemical Check Analysis Limits Titanium and Titanium Alloys AMS2368 Sampling and Testing of Wrought Titanium Raw Material Except Forgings and Forging Stock AMS2750 Pyrometry AMS2809 Identification Titanium and Titanium Alloy Wrought Products SAE INTERNATIO
10、NAL AMS6951 Page 2 of 7 ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS1814 Terminology for Titanium Microstructures AS4194 Sheet and Strip Surface Finish Nomenclature AS6279 Standard Practice for Production, Distribution, and Procurement of Metal Stock 2.2 ASTM Publication
11、s Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A480/A480M General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip ASTM E8/E8M Tension Testing of Metallic Materi
12、als ASTM E290 Bend Testing Material for Ductility ASTM E384 Microindentation Hardness of Materials ASTM E539 Analysis of Titanium Alloys by X-Ray Fluorescence Spectrometry ASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by Inert Gas Fusion ASTM E1447 Determination of
13、Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal Conductivity/Infrared Detection Method ASTM E1941 Determination of Carbon in Refractory and Reactive Metals and Their Alloys by Combustion Analysis ASTM E2371 Analysis of Titanium and Titanium Alloys by Direct Current Plasma an
14、d Inductively Coupled Atomic Emission Spectrometry ASTM E2994 Analysis of Titanium and Titanium Alloys by Spark Atomic Emission Spectrometry and Glow Discharge Atomic Emission Spectrometry 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1; carbon s
15、hall 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 E539, ASTM E2371 or ASTM E2994. Other analytical methods may be used if acceptable to the purchaser. Table 1 - Compo
16、sition Element Min Max Aluminum 4.50 5.50 Vanadium 3.50 4.50 Molybdenum 0.50 1.00 Iron 0.30 0.80 Oxygen 0.12 0.19 Carbon - 0.08 Nitrogen - 0.03 (300 ppm) Hydrogen - 0.015 (150 ppm) Yttrium (3.1.1) - 0.005 ( 50 ppm) Other Elements, each (3.1.1) - 0.10 Other Elements, total (3.1.1) - 0.40 Titanium rem
17、ainder SAE INTERNATIONAL AMS6951 Page 3 of 7 3.1.1 Determination not required for routine acceptance. 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2249. 3.2 Melting Practice Alloy shall be multiple melted. The first melt shall be made by vacuum consumable
18、electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice. The subsequent melt or melts shall be made using vacuum arc remelting (VAR) practice. Alloy additions are not permitted in the final melt cycle. 3.2.1 The atmosphere for nonconsumable electrode
19、 melting shall be 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 Condition The product shall be supplied in the following condition: 3.3.1 Sheet Hot rolle
20、d with or without subsequent cold reduction, annealed, descaled, and leveled, having a surface appearance comparable to a commercial corrosion-resistant steel sheet No. 2D finish (see 8.2). 3.4 Annealing The product shall be annealed by heating to a temperature within the range 1300 to 1450 F (704 t
21、o 788 C), holding at the selected temperature within 25 F (14 C) for a time commensurate with product thickness and the heating equipment and procedure used, and cooling at a rate which will produce product meeting the requirements of 3.5. Pyrometry shall be in accordance with AMS2750. 3.5 Propertie
22、s The product shall conform to the following requirements and also shall meet the requirements of 3.5.1 and 3.5.2 after being reheated in air to 1325 F 15 F (718 C 8 C), held at heat for 20 minutes 2 minutes, cooled at a rate equivalent to an air cool or slower. 3.5.1 Tensile Properties Shall be as
23、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 of 0.002 inch/inch/minute (0.002 mm/mm/minute) through the 0.2% offset yield strain. Table 2 Table 2A - Minimum tensile propert
24、ies, inch/pound units Nominal Thickness Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 inches or 4D % 0.025 to 0.039, incl 131 120 9 0.040 to 0.100, incl 132 124 9 SAE INTERNATIONAL AMS6951 Page 4 of 7 Table 2B - Minimum tensile properties, SI units Nominal Thickness M
25、illimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 50.8 mm or 4D % 0.63 to 1.00, incl 903 827 9 1.01 to 2.54, incl 910 855 9 3.5.1.1 Tensile property requirements apply in both the longitudinal and long transverse directions. 3.5.1.2 Tests in the long transverse directio
26、n need be made only on sheet product that a specimen not less than 8.0 inches (203 mm) in length can be obtained. 3.5.1.3 Mechanical property requirements for product outside the range covered by 1.1 shall be agreed upon between purchaser and producer. 3.5.2 Bending Product 0.100 inch (2.54 mm) and
27、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 E290 through an angle of 105 degrees. The tes
28、t 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 magnification. Table 3
29、 - Bending parameters Nominal Thickness Inches Nominal Thickness Millimeters Bend Factor Up to 0.100, incl Up to 2.54, incl 4.5 3.5.3 Microstructure Shall 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 microstruc
30、ture 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
31、.3.4 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 any one of the following: 3.5.4.1, 3.5.4.2, 3.5.4.3, or other method ac
32、ceptable to purchaser. 3.5.4.1 The bend test of 3.5.2. 3.5.4.2 Examination of a metallographic cross section at 400X minimum magnification. 3.5.4.3 A surface hardness more than 40 points higher than subsurface hardness, determined in accordance with ASTM E384 on the Knoop scale using a 200 g load, s
33、hall be evidence of unacceptable surface contamination. SAE INTERNATIONAL AMS6951 Page 5 of 7 3.6 Quality The 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 tolerances, ripples, and foreign
34、materials and from imperfections detrimental to usage of the product. 3.7 Tolerances Shall conform to all applicable requirements of AMS2242. 3.8 Production, distribution, and procurement of metal stock shall comply with AS6279. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The p
35、roducer 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 specified requirements. 4.2 C
36、lassification of Tests 4.2.1 Acceptance Tests Composition (3.1), condition (3.3), tensile properties (3.5.1), bending (3.5.2), microstructure (3.5.3), surface contamination (3.5.4), and tolerances (3.7) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tes
37、ts Tests of the product after reheating as in 3.5 for tensile properties (3.5.1) and bending properties (3.5.2) are periodic tests and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be in accordance wit
38、h AMS2368 and the following; a lot shall be all product of the same nominal size from the same heat processed at the same time and annealed in the same heat treatment batch. 4.3.1 For Acceptance Tests 4.3.1.1 Composition One sample from each heat, except that for hydrogen determinations one sample f
39、rom each lot obtained after thermal and chemical processing is completed. 4.3.1.2 Tensile Properties, Bending, Microstructure, and Surface Contamination One or more samples from each lot. SAE INTERNATIONAL AMS6951 Page 6 of 7 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report s
40、howing 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 hydrogen content, tensile properties, bending, and surface contamination of each lot, and stating t
41、hat the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6951, product form, size, specific annealing treatment used, and quantity. 4.4.2 When material produced to this specification is beyond the sizes allowed in the
42、 scope or tables, or other exceptions are taken to the technical requirements listed in Section 3, (see 5.1) the report shall contain a statement “This material is certified as AMS6951(EXC) because of the following exceptions:“ and the specific exceptions shall be listed. 4.5 Resampling and Retestin
43、g Shall be in accordance with AMS2368. 5. PREPARATION FOR DELIVERY 5.1 Identification In accordance with AMS2809. When technical exceptions are taken (see 4.4.2), the material shall be marked with AMS6951(EXC). 5.2 Packaging The product shall be prepared for shipment in accordance with commercial pr
44、actice 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. ACKNOWLEDGMENT A producer shall include this specification number in all quotations and when acknowledging purcha
45、se orders. 7. REJECTIONS Product not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 Revision Indicator A change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions
46、, 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) are not used in original publications, nor in documents that contain edito
47、rial changes only. 8.2 Commercial corrosion-resistant steel finishes are defined in ASTM A480/A480M and AS4194. SAE INTERNATIONAL AMS6951 Page 7 of 7 8.3 Terms used in AMS are clarified in ARP1917 and as follows: 8.3.1 “Oil Can” is defined as an excess of material in a localized area of a sheet that
48、 causes the 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. 8.4 Dimensions and properties in inch/pound units and the Fahrenheit tempera
49、tures 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. 8.5 Purchase documents should specify not less than the following: AMS6951 Product form and size of product desired Quantity of product desired Property and acceptance requirements from the cognizant engineering organization
