1、AEROSPACE MATERIAL SPECIFICATION AMS4903 REV. C Issued 2003-04 Revised 2015-03 Superseding AMS4903B Titanium Alloy Sheet, Strip, and Plate 6Al - 4V Solution Heat Treated (Composition similar to UNS R56400) RATIONALE AMS4903C is a Five Year Review and update of this specification that includes the re
2、moval of sample size allowance for hydrogen of Table 1 (covered by ASTM E1447), requires agreement on mechanical property values for material outside specification ranges (3.5.2.1.2), removes the upper limit on ultrasonic quality, adds AS6279 (3.8), adds AMS2368 in sampling and resampling (4.3 and 4
3、.5) and revises the report paragraph (4.4). 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of sheet strip, and plate up through 2.000 inches (50.80 mm), inclusive. 1.2 Application This material has been used typically for parts to be formed or machined in the solution heat
4、treated condition and subsequently precipitation heat treated requiring high strength-to-weight ratio and stability up to 550 F (288 C) in the precipitation heat treated condition, but usage is not limited to such applications. 1.3 Certain processing procedures and service conditions may cause these
5、 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 of this specification to the extent specified herein. The supplier
6、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 shall apply. _ SAE Technical Standards Board Rules provide that: “T
7、his 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 therefrom, is the sole responsibility of the user.” SAE rev
8、iews 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 International All rights reserved. No part of this publication may be reproduced, stored in a retrieval sy
9、stem 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 (outside USA) Fax: 724-776-0790 Email: CustomerServi
10、cesae.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/AMS4903C SAE INTERNATIONAL AMS4903C Page 2 of 8 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrenda
11、le, 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 Titanium Alloy Sheet, Strip, and Plate AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AM
12、S2368 Sampling and Testing of Wrought Titanium Raw Materials, Except Forging and Forging Stock AMS2631 Ultrasonic Inspection, Titanium and Titanium Alloy Bar and Billet AMS2750 Pyrometry AMS2809 Identification, Titanium and Titanium Alloy Wrought Products ARP982 Minimizing Stress-Corrosion Cracking
13、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, Tel: 610-832-9585, www.astm.org. ASTM E8
14、 / E8M Tension Testing of Metallic Materials ASTM E112 Determining Average Grain Size ASTM E290 Bend Testing of Material for Ductility ASTM E384 Knoop and Vickers Hardness of Materials ASTM E539 Analysis of Titanium Alloys by X-Ray Fluorescence Spectrometry ASTM E1409 Determination of Oxygen and Nit
15、rogen in Titanium and Titanium Alloys by the Inert Gas Fusion Technique ASTM E1447 Determination of 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
16、 Combustion Analysis ASTM E2371 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 accordanc
17、e 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 or ASTM E2371. Other analytical methods may be used if acceptable to the purchaser. SAE INTERNATIONAL AMS4903C Page 3 of 8 Table 1 - Compositi
18、on 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 - 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 3.1.1 Determination not
19、required for routine acceptance. 3.1.2 Check Analysis Composition variations shall meet the requirements of AMS2249. 3.2 Melting Practice Alloy shall be multiple melted. The first melt shall be made by vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc col
20、d 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 non-consumable electrode melting shall be vacuum or shall be argon and/or helium at an abs
21、olute 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 and Strip Hot rolled, with or without subsequent cold reduction, solution h
22、eat treated, descaled, and leveled, having a surface appearance comparable to a commercial corrosion- resistant steel No. 2D finish (See 8.3). 3.3.2 Plate Hot rolled, solution treated, and flattened, having a surface appearance comparable to a commercial corrosion-resistant steel No. 1 finish (See 8
23、.3). Plate product shall be produced 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 substituted for plate. 3.4 Solution Heat Treatment The product shall be solution heat treated by
24、heating to a temperature within the range 1650 to 1775 F (899 to 968 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 that will produce product meeting the requirements of 3.5
25、. When vacuum furnace equipment is used, inert gas cooling may be applied. Pyrometry shall be in accordance with AMS2750. 3.5 Properties Product shall conform to the following requirements: SAE INTERNATIONAL AMS4903C Page 4 of 8 3.5.1 As Solution Heat Treated 3.5.1.1 Tensile Properties Shall be as s
26、pecified 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 2A - Tensile properties, inch/pound
27、 units (See 8.2) Nominal Thickness Inch Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 inches or 4D %, min Up to 0.032, excl (See 3.5.1.1.1) 150 (max) 6 (See 3.5.1.1.2) 0.032 to 0.1875, excl (See 3.5.1.1.1) 150 (max) 8 Table 2B - Tensile properties, SI units (See 8.2) Nominal
28、 Thickness Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 50.8 mm or 4D %, min Up to 0.81, excl (See 3.5.1.1.1) 1034 (max) 6 (See 3.5.1.1.2) 0.81 to 4.76, excl (See 3.5.1.1.1) 1034 (max) 8 3.5.1.1.1 Spread between tensile strength and yield strength shall be 15 ksi
29、(103 MPa) minimum. 3.5.1.1.2 For thickness under 0.025 inch (0.64 mm), elongation values shall be as agreed. 3.5.1.2 Bending Product under 0.1875 inch (4.76 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
30、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 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 show
31、n 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 - Bend factor Nominal OD Inches Nominal OD Millimeters Bend Factor Up to 0.070, incl Up to 1.78, incl 9 Over 0.70 to 0.1875, excl Over 1.78 t
32、o 4.762, excl 10 3.5.1.3 Microstructure Shall be that structure resulting from processing within the alpha-beta phase field. Microstructure shall conform to 3.5.1.3.1 or 3.5.1.3.2 (See 8.5). 3.5.1.3.1 Equiaxed and/or elongated primary alpha in a transformed beta matrix with no continuous network of
33、alpha at prior beta grain boundaries. 3.5.1.3.2 Primary alpha in a matrix of equiaxed alpha prime. 3.5.1.3.3 A microstructure showing a continuous network of alpha in prior beta grain boundaries is not acceptable. SAE INTERNATIONAL AMS4903C Page 5 of 8 3.5.1.4 Surface Contamination The product shall
34、 be free of any oxygen-rich layer, such as alpha case, or other surface contamination, determined as in 3.5.1.4.1 or 3.5.1.4.2 or 3.5.1.4.3, or other method acceptable to purchaser. 3.5.1.4.1 The bend test of 3.5.1.2. 3.5.1.4.2 Microscopic examination at 400X minimum. 3.5.1.4.3 Hardness difference;
35、a surface hardness more than 40 points higher than the subsurface hardness, determined in accordance with ASTM E384 on the Knoop scale using a 200 gram load, being evidence of unacceptable surface contamination. 3.5.2 Response to Heat Treatment Product shall conform to the following requirements aft
36、er being precipitation heat treated at 900 to 1275 F 15 (482 to 691 C 8), holding at heat for 2 to 8 hours, and cooling in air. Precipitation heat treatment shall precede final machining of specimens. Pyrometry shall be in accordance with AMS2750. 3.5.2.1 Tensile Properties Shall be as shown in Tabl
37、e 4, 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 4A - Minimum tensile properties, inch/pound units (
38、See 8.2) Nominal Thickness Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 inches or 4D % Up to 0.032, excl 160 145 3 (See 3.5.2.1.1) 0.032 to 0.049, excl 160 145 4 0.049 to 0.1875, excl 160 145 5 0.1875 to 0.750, excl 160 145 8 0.750 to 1.000, excl 150 140 6 1.000 to 2
39、.000, incl 145 135 6 Table 4B - Minimum tensile properties, SI units (See 8.2) Nominal Thickness mm Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 50.8 mm or 4D % Up to 0.81, excl 1103 1000 3 (See 3.5.2.1.1) 0.81 to 1.24, excl 1103 1000 4 1.24 to 4.76, excl 1103 1000 5 4.76 to
40、19.05, excl 1103 1000 8 19.05 to 25.40, excl 1034 965 6 25.40 to 50.80, incl 1000 931 6 3.5.2.1.1 For thickness under 0.025 inch (0.635 mm), elongation values shall be as agreed. 3.5.2.1.2 Mechanical property requirements for product outside the size range covered by Table 4 shall be agreed upon bet
41、ween purchaser and producer. SAE INTERNATIONAL AMS4903C Page 6 of 8 3.6 Quality The product, as received by purchaser, shall be uniform in quality and condition, sound, and free from “oil cans” (See 8.4) of depth in excess of the flatness tolerances, ripples, and foreign materials and from imperfect
42、ions detrimental to usage of the product. 3.6.1 Ultrasonic Inspection Plate 0.500 inch (12.70 mm) and over in nominal thickness shall meet Class A1 requirements of AMS2631. 3.7 Tolerances In accordance with AMS2242. 3.8 Production, distribution, and procurement of metal stock shall comply with AS627
43、9. This requirement becomes effective October 1, 2016. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer 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
44、 and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests Tests for all technical requirements are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.1 Ultrasonic inspection of each
45、 plate when required by 3.6.1. 4.3 Sampling and Testing Shall be in accordance with 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 in the same heat treatment batch. 4.3.1 Composition One sample from each heat, except t
46、hat for hydrogen determinations one sample from each lot obtained after thermal and chemical processing is completed. 4.3.2 Tensile Properties, Bending, Microstructure, Surface Contamination, Average Grain Size, and Tensile Properties after Precipitation Hardening At least one sample from each lot.
47、4.3.2.1 Specimens for tensile tests of widths 9 inches (229 mm) and over shall be taken in both the longitudinal and transverse directions; for widths under 9 inches (229 mm), specimens shall be taken in the longitudinal direction. 4.3.2.2 Bend Specimens Whenever possible, the specimen shall be long
48、 enough to permit two separate bends so that each surface is tested in tension. 4.3.3 Ultrasonic Quality Each plate, when required (3.6.1). SAE INTERNATIONAL AMS4903C Page 7 of 8 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report showing producer identity, country where the met
49、al 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, and surface contamination, tensile properties after precipitation heat treatment of each lot, ultrasonic quality, when required, and stating that the product conforms to the other technical requirements. This re
