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 there
2、from, 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 International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (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:/www.sae.org/technical/standards/AMS4911N AEROSPACE MATERIAL SPECIFICATION AMS4911 REV. N Issued 1957-07 Revised 2
5、014-03 Superseding AMS4911M Titanium Alloy, Sheet, Strip, and Plate 6Al - 4V Annealed (Composition similar to UNS R56400) RATIONALE AMS4911N results from an update of this specification to restrict material to the sizes of the mechanical property tables (1.1), to require vacuum in the first consumab
6、le electrode melt (3.2) and agreement of mechanical property values on material outside specification ranges (3.5.1.3 and 8.5), and includes ultrasonic testing of all plate 0.500 inch (12.70 mm) and over (3.6.1), adds AS6279 (3.8) and revises the report paragraph (4.4). 1. SCOPE 1.1 Form This specif
7、ication covers a titanium alloy in the form of sheet, strip, and plate up through 4.000 inches (101.60 mm) inclusive in thickness (See 8.5). 1.2 Application These products have been used typically for parts requiring strength up to 750 F (399 C), but usage is not limited to such applications. 1.2.1
8、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 DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part
9、 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 document
10、 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 724-776-4970 (outside USA), www.sae.org. AMS2242 Tolerances, Corrosion and Heat Resistant Steel, Iron Alloy, Titanium, and Titanium All
11、oy Sheet, Strip, and Plate SAE INTERNATIONAL AMS4911N Page 2 of 7 AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS2631 Ultrasonic Inspection, Titanium and Titanium Alloy Bar and Billet AMS2750 Pyrometry AMS2809 Identification, Titanium and Titanium Alloy Wrought Products ARP9
12、82 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products AS6279 Industry Standard Practices for Production, Distribution, and Procurement of Metal Stock 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,
13、Tel: 610-832-9585, www.astm.org. ASTM E 8 / E 8M Tension Testing of Metallic Materials ASTM E 290 Bend Testing Material for Ductility ASTM E 384 Knoop and Vickers Hardness of Materials ASTM E 539 Analysis of Titanium Alloys by X-Ray Fluorescence Spectrometry ASTM E 1409 Determination of Oxygen and N
14、itrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Technique ASTM E 1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal Conductivity/Infrared Detection Method ASTM E 1941 Determination of Carbon in Refractory and Reactive Metals and Their Alloy
15、s by Combustion Analysis ASTM E 2371 Analysis of Titanium and Titanium Alloys by Direct Current Plasma and Inductively Coupled Plasma Atomic Emission Spectrometry 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1; carbon shall be determined in acco
16、rdance 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 539 or ASTM E 2371. Other analytical methods may be used if acceptable to the purchaser. TABLE 1 - COMPOSITION Element min max Aluminum 5
17、.50 6.75 Vanadium 3.50 4.50 Iron - 0.30 Oxygen - 0.20 Carbon - 0.08 Nitrogen - 0.05 (500 ppm) Hydrogen (3.1.2) - 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 remainder SAE INTERNATIONAL AMS4911N Page 3 of 7 3.1.1
18、Determination not required for routine acceptance. 3.1.2 Sample size, when using ASTM E 1447, may be as large as 0.35 gram. 3.1.3 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
19、 by vacuum consumable electrode, 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 atm
20、osphere 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. 3.2.2 The electrode tip for nonconsumable electrode melting shall be water-cooled copper. 3.3 Condition The product shall be supplied in the followi
21、ng condition: 3.3.1 Sheet and Strip Hot rolled 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). 3.3.2 Plate Hot rolled, annealed, descaled, and flattened, having
22、 a surface appearance comparable to a commercial corrosion-resistant steel No. 1 finish (See 8.2). Plate product shall be produced using standard industry practices for the production of plate to the procured thickness. Bar, billet, forgings, or forging stock shall not be substituted for plate. 3.4
23、Annealing The product shall be annealed by heating to a temperature within the range 1300 to 1650 F (704 to 899 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 pro
24、duce product meeting the requirements of 3.5. Pyrometry shall be in accordance with AMS2750. 3.5 Properties 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 (718 C 8), held at heat for 20 minutes
25、2, cooled at a rate equivalent to an air cool or slower. 3.5.1 Tensile Properties Shall be as 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.
26、002 mm/mm/minute) through the 0.2% offset yield strain. SAE INTERNATIONAL AMS4911N Page 4 of 7 TABLE 2A - MINIMUM TENSILE PROPERTIES, INCH/POUND UNITS Nominal Thickness, Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 inches or 4D % Up to 0.008, excl 134 126 - 0.008 to
27、0.025, excl 134 126 6 0.025 to 0.063, excl 134 126 8 0.063 to 0.1875, excl 134 126 10 0.1875 to 4.000, incl 130 120 10 TABLE 2B - MINIMUM TENSILE PROPERTIES, SI UNITS Nominal Thickness, Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset, MPa Elongation in 50.8 mm or 4D, % Up to 0.20, exc
28、l 920 869 - 0.20 to 0.63, excl 920 869 6 0.63 to 1.60, excl 920 869 8 1.60 to 4.76, excl 920 869 10 4.76 to 101.60, incl 893 827 10 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 direction need be made only on
29、 sheet and strip product that a specimen not less than 8.0 inches (203 mm) in length can be obtained; for plate, tests in the long transverse direction need be made only on product at least 0.375 inches (9.5 mm) thick that a specimen at least 2.50 inches (63.5 mm) in length can be obtained. 3.5.1.3
30、Mechanical property requirements for product outside the range covered by Table 2 shall be agreed upon between purchaser and producer. 3.5.2 Bending Product under 0.1875 inch (4.762 mm) in nominal thickness shall have a test sample prepared nominally 0.750 inch (19.06 mm) in width, with its axis of
31、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 an angle of 105 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
32、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 - BENDING PARAMETERS Nominal Thickness Inch Nominal Thickness Millimeters Bend Factor Up to 0.070, incl Up to 1.78, in
33、cl 4.5 Over 0.070 to 0.1874, incl Over 1.78 to 4.76, incl 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 microstructure showing a continuous network of alpha in prior beta grain bound
34、aries 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 Partially broken and distorted grain boundary alpha with plate-
35、like alpha. SAE INTERNATIONAL AMS4911N Page 5 of 7 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 acceptable to purchaser. 3.5.4.
36、1 The bend test of 3.5.2. 3.5.4.2 Microscopic examination at 400X minimum. 3.5.4.3 A surface hardness more than 40 points higher than subsurface hardness, determined in accordance with ASTM E 384 on the Knoop scale using a 200-gram load, shall be evidence of unacceptable surface contamination. 3.6 Q
37、uality 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 materials and from imperfections detrimental to usage of the product. 3.6.1 Plate 0.500 inches (12.
38、70 mm) and over in nominal thickness shall be ultrasonically inspected in accordance with AMS2631 and shall meet Class A1 requirements of that document. 3.7 Tolerances Shall conform to all applicable requirements of AMS2242. 3.7.1 Special flatness may be specified for plate; in which case, the speci
39、al flatness tolerances of AMS2242 apply. 3.8 Production, distribution, and procurement of metal stock shall comply with AS6279. This requirement becomes effective October 1, 2015. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of the product shall supply all samples for
40、 vendors 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 Classification of Tests 4.2.1 Acceptance Tests 4.2.1.1
41、 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. 4.2.1.2 When required, ultrasonic quality (3.6.1) of each plate
42、, 4.2.2 Periodic Tests 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 vendor unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be
43、 in accordance with the following; a lot shall be all product of the same nominal size from the same heat processed at the same time: SAE INTERNATIONAL AMS4911N Page 6 of 7 4.3.1 For Acceptance Tests 4.3.1.1 Composition One sample from each heat, except that for hydrogen determinations one sample fr
44、om 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. 4.3.1.3 Ultrasonic Quality Each plate, when required by 3.6.1. 4.4 Reports 4.4.1 The producer shall furnish with
45、each shipment a report showing 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 hydrogen content, tensile properties, bending, and surface contaminat
46、ion of each lot, and ultrasonic inspection of each plate, when required, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS4911N, product form, size, specific annealing treatment used, and quantity
47、. 4.4.2 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 Retesting If 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
48、 three additional 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 DELIVERY 5.1 Identification In accordance with A
49、MS2809. 5.2 Packaging The 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. ACKNOWLEDGMENT A vendor shall include this specification number and its revision letter in all quotations and when acknowledging purcha
