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 2017 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:/standards.sae.org/AMS4981H AEROSPACE MATERIAL SPECIFICATION AMS4981 REV. H Issued 1972-11 Revised 2017-09 Superse
5、ding AMS4981G Titanium Alloy Bars, Wire, and Forgings 6.0Al - 2.0Sn - 4.0Zr - 6.0Mo Solution and Precipitation Heat Treated (Composition similar to UNS R56260) RATIONALE AMS4981H results from a Five-Year Review and update of this specification that includes the addition of ASTM E539 and ASTM E2994 (
6、3.1), removal of sample size allowance for hydrogen of Table 1 (covered by ASTM E1447) and revises heat treatment cooling rate (3.4) and microstructure (3.5.1.3). 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of bars, wire, and forgings up through 4.000 inches (101.60 mm),
7、 inclusive, in diameter or least distance between parallel sides and forging stock of any size (see 8.6). 1.2 Application This alloy has been used typically for parts requiring high strength up to 1000 F (538 C), but usage is not limited to such applications. 1.2.1 Certain processing procedures and
8、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 of this specification to the exte
9、nt 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 shall apply. 2.1 SAE Publications
10、 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. AMS2241 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Bars and Wire AMS2249 Chemic
11、al Check Analysis Limits Titanium and Titanium Alloys SAE INTERNATIONAL AMS4981H Page 2 of 8 AMS2368 Sampling and Testing of Wrought Titanium Raw Material Except Forgings and Forging Stock AMS2750 Pyrometry AMS2808 Identification Forgings AMS2809 Identification Titanium and Titanium Alloy Wrought Pr
12、oducts ARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS1814 Terminology for Titanium Microstructures AS6279 Standard Practice for Production, Distribution, and Procurement of Metal Stock 2.2 ASTM
13、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/E8M Tension Testing of Metallic Materials ASTM E21 Elevated Temperature Tension Tests of Metallic Materials ASTM E139 Conducting Creep, Cre
14、ep-Rupture, and Stress-Rupture Tests of Metallic Materials ASTM E292 Conducting Time-for-Rupture Notch Tension Tests 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 Fusi
15、on Technique ASTM E1447 Determination of Hydrogen in Titanium and Titanium Alloys by 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 Titani
16、um Alloys by Direct Current Plasma and Inductively Coupled Plasma 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 perc
17、entages by weight shown in Table 1; carbon shall 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
18、 acceptable to the purchaser. SAE INTERNATIONAL AMS4981H Page 3 of 8 Table 1 - Composition Element Min Max Aluminum 5.50 6.50 Zirconium 3.50 4.50 Tin 1.75 2.25 Molybdenum 5.50 6.50 Iron - 0.15 Oxygen - 0.15 Carbon - 0.04 Nitrogen - 0.04 (400 ppm) Hydrogen (3.1.1) - 0.0125 (125 ppm) Yttrium (3.1.2) -
19、 0.005 ( 50 ppm) Other Elements, each (3.1.2) - 0.10 Other Elements, total (3.1.2) - 0.40 Titanium remainder 3.1.1 Hydrogen content of forgings may be as high as 0.0150 (150 ppm). 3.1.2 Determination not required for routine acceptance. 3.1.3 Check Analysis Composition variations shall meet the appl
20、icable 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 cold hearth melting practice. The subsequent melt or melts shall be made using vacuum ar
21、c remelting (VAR) practice. Alloy additions are not permitted in the final VAR melt. 3.2.1 The atmosphere for nonconsumable electrode melting shall be vacuum or shall be inert gas at a pressure not higher than 1000 mm of mercury. 3.2.2 The electrode tip for nonconsumable electrode melting shall be w
22、ater-cooled copper. 3.3 Condition The product shall be supplied in the following condition: 3.3.1 Bars Hot finished, solution and precipitation heat treated, and descaled. The product shall be produced using standard industry practices designed strictly for the production of bar stock to the procure
23、d size. Cut plate shall not be supplied in lieu of bar. 3.3.1.1 Round bars shall be solution and precipitation heat treated and ground, turned, or machined. 3.3.2 Wire Cold drawn, solution and precipitation heat treated, and descaled. 3.3.3 Forgings Solution and precipitation heat treated and descal
24、ed. SAE INTERNATIONAL AMS4981H Page 4 of 8 3.3.4 Forging Stock As ordered by the forging manufacturer. 3.4 Heat Treatment Bars and forgings 0.50 inch (12.7 mm) and over in nominal diameter or least distance between parallel sides shall be solution heat treated by heating in a suitable atmosphere to
25、1500 to 1675 F (816 to 913 C), holding at the selected temperature within 25 F (14 C) for not less than 1 hour, and cooling at a rate equivalent to an air cool or faster, and precipitation heat treated by heating to 1100 F 15 F (593 C 8 C), holding at heat for 4 to 8 hours, and cooling in air. Heat
26、treatment for product under 0.50 inch (12.7 mm) nominal diameter or least distance between parallel sides shall be as agreed upon by purchaser and producer. Pyrometry shall be in accordance with AMS2750. 3.5 Properties The product shall conform to the following requirements: 3.5.1 Bars, Wire, and Fo
27、rgings Product 4.000 inches (101.60 mm) and under in nominal diameter or least distance between parallel sides shall have the following properties: 3.5.1.1 Tensile Properties 3.5.1.1.1 At Room Temperature Shall be as specified in Table 2, determined in accordance with ASTM E8/E8M with the rate of st
28、rain 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 properties, inch/pound units Form Nominal Diameter or Least Distance Between Parallel Side
29、s Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 Inches or 4D % Reduction of Area % L T L T Wire Up to 0.500, incl 170 160 10 8 20 15 Bars Over 0.500 to 2.500, incl 170 160 10 8 20 15 Bars Over 2.500 to 3.000, incl 165 155 8 6 15 12 Forgings Up to 3.000, incl 170 160 1
30、0 8 20 15 Bars and Forgings Over 3.000 to 4.000, incl 160 150 8 6 15 12 Table 2B - Minimum tensile properties, SI units Form Nominal Diameter or Least Distance Between Parallel Sides Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 50.8 mm or 4D % Reduction of Area %
31、L T L T Wire Up to 12.70, incl 1172 1103 10 8 20 15 Bars Over 12.70 to 63.50, incl 1172 1103 10 8 20 15 Bars Over 63.50 to 76.20, incl 1138 1069 8 6 15 12 Forgings Up to 76.20, incl 1172 1103 10 8 20 15 Bars and Forgings Over 76.20 to 101.60, incl 1103 1034 8 6 15 12 SAE INTERNATIONAL AMS4981H Page
32、5 of 8 3.5.1.1.2 At 800 F (427 C) Product shall meet the requirements shown in Table 3, determined in accordance with ASTM E21 on specimens heated to 800 F 5 F (427 C 3 C), held at heat for 20 to 30 minutes before testing, and tested at 800 F 5 F (427 C 3 C) using strain rates as specified in 3.5.1.
33、1.1: Table 3 - Minimum tensile properties at 800 F (427 C) Property Value Tensile Strength 135 ksi (931 MPa) Yield Strength at 0.2% Offset 105 ksi (724 MPa) Elongation in 4D 10% Reduction of Area 30% 3.5.1.1.3 Yield strength and reduction of area requirements do not apply to wire under 0.125 inch (3
34、.18 mm) in nominal diameter. 3.5.1.1.4 Tensile property requirements apply in both the longitudinal and transverse directions, but tests in the transverse direction need be made only on product that specimens not less than 2.50 inches (63.5 mm) in length can be taken. Tests in the longitudinal direc
35、tion are not required on product tested in the transverse direction. 3.5.1.1.5 Mechanical property requirements for product outside the size range covered by 1.1 shall be agreed upon between purchaser and producer. 3.5.1.2 Creep Test at 800 F (427 C) A smooth tensile specimen shall be maintained at
36、800 F 5 F (427 C 3 C) under continuously applied axial stress of 95 ksi (655 MPa). Time to attain 0.2% plastic deformation shall be not less than 35 hours. If plastic deformation is less than 0.2% after 35 hours, the test may be discontinued; the amount of plastic deformation in 35 hours shall be re
37、ported. Gage dimensions of specimen and technique used to measure creep shall be as agreed upon by purchaser and producer (see 8.6). Test shall be conducted in accordance with ASTM E139. 3.5.1.3 Microstructure Shall be that structure resulting from processing within the alpha-beta phase field. Micro
38、structure 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 alpha at prior beta grain boundaries. 3.5.1.3.2 Primary alpha in an aged transformed beta matrix. 3.5.1.4 Surface Contamination Ex
39、cept as specified in 3.5.1.4.1 and 3.5.1.4.2, product shall be free of any oxygen-enriched layer (see 8.2), such as alpha case, or other surface contamination, determined by microscopic examination at not lower than 400X magnification or by other method agreed upon by purchaser and producer. 3.5.1.4
40、.1 An oxygen-rich layer not greater than 0.001 inch (0.025 mm) in depth will be permitted on bars other than round. 3.5.1.4.2 When permitted by purchaser, forgings to be machined all over may have an oxygen-rich layer provided such layer is removable within the machining allowance on the forgings. S
41、AE INTERNATIONAL AMS4981H Page 6 of 8 3.5.2 Forging Stock When a sample of stock is forged to a test coupon and heat treated as in 3.4, specimens taken from the coupon shall conform to the requirements of 3.5.1.1.1. If specimens taken from the stock after heat treatment as in 3.4 conform to the requ
42、irements of 3.5.1.1.1, the tests shall be accepted as equivalent to tests of a forged coupon. 3.6 Quality The product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the product. 3.7 Tolerance
43、s Bars and wire shall conform to the applicable requirements of AMS2241. 3.8 Production, distribution, and procurement of metal stock shall comply with AS6279. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples for producers tests a
44、nd 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 The following requireme
45、nts are acceptance tests and shall be performed on each heat or lot as applicable: 4.2.1.1 Composition (3.1) of each heat. 4.2.1.2 Hydrogen content (3.1), room-temperature tensile properties (3.5.1.1.1), microstructure (3.5.1.4), and surface contamination (3.5.1.5) of each lot of bars, wire, and for
46、gings. 4.2.1.3 Tolerances (3.6) of bars and wire. 4.2.2 Periodic Tests The following requirements are periodic tests and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser: 4.2.2.1 Tensile properties at 800 F (427 C) (3.5.1.1.2) and creep
47、 properties at 800 F (427 C) (3.5.1.2) of bars, wire, and forgings. 4.2.2.2 Ability of forging stock to develop required properties (3.5.2). 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, process
48、ed at the same time and heat treated in the same batch: 4.3.1 For Acceptance Tests 4.3.1.1 Composition One sample from each heat, except that for hydrogen determinations one sample from each lot obtained after thermal and chemical processing is completed. SAE INTERNATIONAL AMS4981H Page 7 of 8 4.3.1
49、.2 Tensile Properties At least one sample from each lot of bars and wire. One longitudinal specimen from each lot of forgings from a section having maximum thickness and from a section having minimum thickness. 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report showing producer identity, country where the metal was melted (i.e., final melt in the case of
