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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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication ma
3、y 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: 724-776-4970 (outside USA)
4、Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AMS 4911K AEROSPACE MATERIAL SPECIFICATION Issued JUL 1957 Revised FEB 2007 Superseding AMS 4911J Titanium Alloy, Sheet, Strip, and Plate 6AI - 4V Annealed RATIONALE AMS 4911K results from a review and update that inc
5、ludes revision of reporting requirements and correction of heading in Table 2. 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of sheet, strip, and plate. 1.2 Application These products have been used typically for parts requiring strength up to 750 F (399 C), but usage is n
6、ot 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 DOCUMENTS The issue of the following documents in effect on the
7、 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, t
8、he last published issue of that document 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), or www.sae.org. AMS 2242 Tolerances, Corrosion and Heat-Resistant S
9、teel, Iron Alloy, Titanium, and Titanium Alloy Sheet, Strip, and Plate AMS 2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS 2631 Ultrasonic Inspection, Titanium and Titanium Alloy Bar and Billet AMS 2750 Pyrometry AMS 2809 Identification, Titanium and Titanium Alloy Wrought Prod
10、ucts ARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products - - - - SAE AMS 4911K - 2 - 2.2 ASTM Publications Available from ASTM 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 Tension Testin
11、g of Metallic Materials ASTM E 290 Bend Testing Material for Ductility ASTM E 384 Microindentation Hardness of Materials ASTM E 539 X-Ray Emission Spectrometric Analysis of 6AI-4V Titanium Alloy ASTM E 1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion
12、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 Alloys ASTM E 2371 Analysis of Titanium and Titanium Alloys by Atomic
13、 Emission Plasma Spectrometry 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall 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 eleme
14、nts 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 5.50 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) Yttr
15、ium (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 3.1.1 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 shal
16、l meet the applicable requirements of AMS 2249. 3.2 Melting Practice 3.2.1 Alloy shall be multiple melted. Melting cycle(s) prior to the final melting cycle shall be made using vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice
17、. The final melting cycle shall be made under vacuum using vacuum arc remelting (VAR) practice with no alloy additions permitted. 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. 3.2
18、.1.2 The electrode tip for nonconsumable electrode melting shall be water-cooled copper. - - - - SAE AMS 4911K - 3 - 3.3 Condition The product shall be supplied in the following condition: 3.3.1 Sheet and Strip Hot rolled with or without subsequent cold reduction, annealed, descaled, and leveled, ha
19、ving a surface appearance comparable to a commercial corrosion-resistant steel No. 2D finish (See 8.2). 3.3.2 Plate Hot rolled, annealed, descaled, and flattened, having a surface appearance comparable to a commercial corrosion- resistant steel No. 1 finish (See 8.2). Plate product shall be produced
20、 using standard industry practices designed strictly for the production of plate stock to the procured thickness. Bar, billet, forgings, or forging stock shall not be supplied in lieu of plate. 3.4 Annealing The product shall be annealed by heating to a temperature within the range 1300 to 1650 F (7
21、40 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 produce product meeting the requirements of 3.5. Pyrometry shall be in accordance with AMS 2750. 3.5 Prop
22、erties The product shall conform to the following requirements and 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 2, cooled at a rate equivalent to an air cool or slower, and descaled. 3.5.1 Tensile Properties Shall be a
23、s specified in Table 2, determined in accordance with ASTM E 8 with the rate of strain maintained at 0.003 to 0.007 inch/inch per minute (0.003 to 0.007 mm/mm per minute) through the yield strength and then increased so as to produce failure in approximately one additional minute. When a dispute occ
24、urs between purchaser and vendor over the yield strength values, a referee test shall be performed on a machine having a strain rate pacer using a rate of 0.005 inch/inch per minute (0.005 mm/mm per minute) through the yield strength. TABLE 2A - MINIMUM TENSILE PROPERTIES, INCH/POUND UNITS Nominal T
25、hickness, 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 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
26、 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, excl 920 866 - 0.20 to 0.63, excl 920 866 6 0.63 to 1.60, excl 920 866 8 1.60 to 4.76, excl 920 866 10 4.76 to 101.6, incl 893 823 10 - - - - SAE AMS 4911K - 4 - 3
27、.5.1.1 Tensile property requirements apply in both the longitudinal and transverse directions but tests in the transverse direction need be made only on product from which a specimen not less than 8.0 inches (203 mm) in length for sheet and strip and 2.50 inches (63.5 mm) in length for plate can be
28、taken. Tests in the transverse direction are not required on product tested in the longitudinal direction. 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 bending parallel to the dir
29、ection 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 diameter equal to the bend factor shown
30、in Table 3 times the nominal thickness. Examination of the bent sample shall show no 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, incl 9 Over 0.070 to 0.1874,
31、 incl Over 1.78 to 4.76, incl 10 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 boundaries is not acceptable. 3.
32、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-like alpha. 3.5.4 Surface C
33、ontamination 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. 3.5.4.1 The bend test of 3.5.2. 3.5.4.2 Microscopic examination at 400X
34、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 Quality The product, as received by purchaser, shall be uniform in
35、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 to 4.000 inches (12.7 to 101.6 mm), inclusive, in nominal thickness, shall b
36、e ultrasonically inspected in accordance with AMS 2631 and shall meet Class A1 requirements of AMS 2631. 3.7 Tolerances Shall conform to all applicable requirements of AMS 2242. - - - - SAE AMS 4911K - 5 - 3.7.1 Special flatness may be specified for plate; in which case, the special flatness toleran
37、ces of AMS 2242 apply. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The 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 perform any confirmatory tes
38、ting deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification 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), ultrasonic quality (3.6.1),
39、and tolerances (3.7) are acceptance tests and shall be performed on each heat or lot as applicable. 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 t
40、he vendor unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be 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: 4.3.1 For Acceptance Tests 4.3.1.1 Composition One sample from each
41、heat, except that for hydrogen determinations one sample from 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. 4.3.1.2.1 Specimens for tensile tests of widths 9 inch
42、es (229 mm) and over shall be taken with the axis of the specimen 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. Specimens from product under 2 inches (50.8 mm) in width shall be as agreed up
43、on by purchaser and vendor. 4.4 Reports 4.4.1 Raw Material The vendor shall provide a copy of the original material manufacturers report (material certification) including: producer name, product form, mill produced size, and country where the metal was melted (i.e., final melt in the case of metal
44、processed by multiple melting operations). The vendor of the product shall furnish with each shipment a report showing the results of tests for composition of each heat and for hydrogen content, tensile properties, bending, ultrasonic inspection, and surface contamination of each lot, and stating th
45、at the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS 4911K, size, specific annealing treatment used, and quantity. - - - - SAE AMS 4911K - 6 - 4.4.2 Fabricated Parts A copy of the original manufacturers report (material certification) shall be provided by the vendor to the purchaser when the purchase order specifies AMS 4911K. 4.5 Resampling a