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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 2008 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 4973F AEROSPACE MATERIAL SPECIFICATION Issued 1966-05 Revised 2008-02 Superseding AMS 4973E Titanium Alloy Forgings 8Al - 1Mo - 1V Solution Heat Treated and Stabilized (Composition similar to UNS R54810) RATIONALE
5、 AMS 4973F results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of forgings and forging stock. 1.2 Application This alloy has been used typically for parts requiring strength up to 800 F (427 C), but usage is not l
6、imited to such applications. 1.2.1 Certain processing procedures and service conditions may cause these forgings 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 dat
7、e 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, the l
8、ast 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), www.sae.org. AMS 2249 Chemical Check Analysis Limits, Titanium and Tita
9、nium Alloys AMS 2808 Identification, Forgings AMS 2750 Pyrometry ARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products SAE AMS 4973F - 2 - 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 61
10、0-832-9585, www.astm.org. ASTM E 8 Tension Testing of Metallic Materials ASTM E 21 Elevated Temperature Tension Tests of Metallic Materials ASTM E 1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Technique ASTM E 1447 Determination of Hydrogen in Tita
11、nium 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 Emission Plasma Spectrometry 3. TECHNICAL REQUIREMENTS
12、 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 elements in accordance with ASTM E 2371. Other analytical me
13、thods may be used if acceptable to the purchaser. TABLE 1 - COMPOSITION Element min max Aluminum 7.35 8.35 Molybdenum 0.75 1.25 Vanadium 0.75 1.25 Iron - 0.30 Oxygen - 0.12 Carbon - 0.08 Nitrogen - 0.05 (500 ppm) Hydrogen (3.1.3) - 0.0150 (150 ppm) Yttrium (3.1.1) - 0.005 ( 50 ppm) Other Elements, e
14、ach (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 Check Analysis Composition variations shall meet the applicable requirements of AMS 2249; no variation over maximum will be permitted for yttrium. 3.1.3 Sample si
15、ze when using ASTM E 1447 for hydrogen may be as large as 0.35 gram. 3.2 Melting Practice 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 m
16、elting practice. The final melting cycle shall be made under vacuum using vacuum arc remelting (VAR) practice with no alloy addition permitted. 3.2.1 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
17、mercury. 3.2.2 The electrode tip for nonconsumable electrode melting shall be water-cooled copper. SAE AMS 4973F - 3 - 3.3 Condition The product shall be supplied in the following condition: 3.3.1 Forgings Solution heat treated, stabilized, and descaled. 3.3.2 Forging Stock As ordered by the forging
18、 manufacturer. 3.4 Heat Treatment Forgings shall be heat treated as follows, furnace surveys and calibration of temperature controllers and recorders shall be in accordance with AMS 2750: 3.4.1 Solution Heat Treatment Shall be as specified in 3.4.1.1 unless purchaser permits treatment as specified i
19、n 3.4.1.2. 3.4.1.1 Heat to a temperature within the range 1800 to 1850 F (982 to 1010 C), hold at the selected temperature within 25 F (14 C) for 60 minutes 5, and quench in oil or water; when permitted by purchaser, forgings may be air cooled. 3.4.1.2 Heat to a temperature within the range 1650 to
20、1700 F (899 to 927 C), hold at the selected temperature within 25 F (14 C) for 60 minutes 5, and cool at a rate equivalent to an air cool or faster. 3.4.2 Stabilization Heat Treatment Heat to a temperature within the range 1050 to 1100 F (566 to 593 C), hold at the selected temperature within 15 F (
21、8 C) for not less than 8 hours, and cool in air. 3.5 Properties The product shall conform to the following requirements: 3.5.1 Forgings 3.5.1.1 Tensile Properties Shall be as follows for cross-sections 4.000 inches (101.60 mm) and under at time of heat treatment: 3.5.1.1.1 At Room Temperature Shall
22、be as 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/minute (0.003 to 0.007 mm/mm/minute) through the yield strength and then increased so as to produce failure in approximately one additional minute. When a dispute occurs
23、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/minute (0.005 mm/mm/minute) through the yield strength and a minimum cross head speed of 0.10 inch (2.5 mm) per minute above the yie
24、ld strength. SAE AMS 4973F - 4 - TABLE 2A - MINIMUM TENSILE PROPERTIES, INCH/POUND UNITS Nominal Cross-Section Thickness Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 4D % Reduction of Area % Up to 2.500, excl 130 120 10 20 2.500 to 4.000, incl 120 110 10 20 TABLE 2B -
25、MINIMUM TENSILE PROPERTIES, SI UNITS Nominal Cross-Section Thickness Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 4D % Reduction of Area % Up to 63.50, excl 896 827 10 20 63.50 to 101.60, incl 827 758 10 20 3.5.1.1.2 At 800 F (427 C) Shall be as specified in Table
26、 3, determined in accordance with ASTM E 21 on specimens heated to 800 F 10 (427 C 6), held at heat for 20 to 30 minutes before testing, and tested at 800 F 10 (427 C 6). TABLE 3A - MINIMUM TENSILE PROPERTIES AT 800 F, INCH/POUND UNITS Nominal Cross-Section Thickness Inches Tensile Strength ksi Yiel
27、d Strength at 0.2% Offset ksi Elongation in 4D % Reduction of Area % Up to 2.500, excl 90 70 10 25 2.500 to 4.000, incl 80 60 10 25 TABLE 3B - MINIMUM TENSILE PROPERTIES AT 427 C, SI UNITS Nominal Cross-Section Thickness Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation i
28、n 4D % Reduction of Area % Up to 63.50, excl 621 483 10 25 63.50 to 101.60, incl 552 414 10 25 3.5.1.1.3 Tensile property requirements apply in both the longitudinal and transverse directions but tests in the transverse direction need be made only on product from that specimens not less than 2.500 i
29、nches (63.50 mm) in length can be taken. Testing in the longitudinal direction is not required on product tested in the transverse direction. 3.5.1.2 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
30、.3.2. 3.5.1.2.1 Equiaxed and/or elongated primary alpha in a transformed beta matrix with no continuous network of alpha at prior beta grain boundaries. 3.5.1.2.2 Essentially complete field of equiaxed and/or elongated alpha with no continuous network of alpha at prior beta grain boundaries. 3.5.1.3
31、 Surface Contamination Except as permitted by 3.5.1.3.1, forgings shall be free of any oxygen-rich layer, such as alpha case (See 8.2), or other surface contamination, determined by microscopic examination at not lower than 400X magnification or other method acceptable to purchaser. SAE AMS 4973F -
32、5 - 3.5.1.3.1 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 forging. 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
33、from the heat treated 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 requirements 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 purch
34、aser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the product. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of the product shall supply all samples for vendors tests and shall be resp
35、onsible 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 requirements are acceptan
36、ce tests and shall be performed on each heat or lot, as applicable. 4.2.1.1 Composition (3.1) of each heat and hydrogen content of each lot. 4.2.1.2 Tensile properties at room temperature (3.5.1.1.1), microstructure (3.5.1.2), and surface contamination (3.5.1.3) of each lot of forgings. 4.2.2 Period
37、ic Tests Forgings for tensile properties at 800 F (427 C) (3.5.1.1.2) and of forging stock to demonstrate ability to develop required 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
38、 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, and solution and stabilization heat treated in the same heat treat batch: 4.3.1 For Acceptance Tests 4.3.1.1 Composition One sample from each h
39、eat, except that for hydrogen determinations one sample from each lot obtained after thermal and chemical processing is completed. 4.3.1.2 Tensile Properties The number, location, and orientation of samples from each lot of forgings shall be as agreed upon by purchaser and vendor. SAE AMS 4973F - 6
40、- 4.4 Reports 4.4.1 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 processed by multiple melting operatio
41、ns). The vendor of forgings shall furnish with each shipment a report showing the results of tests for composition of each heat and for the hydrogen content and room- temperature tensile properties of each lot, and stating that the product conforms to the other technical requirements. This report sh
42、all include the purchase order number, heat and lot numbers, AMS 4973F, product form and size and part number (if applicable), specific heat treatment used, quantity, and the size of stock used to make the forgings. 4.4.2 The vendor of forging stock shall furnish with each shipment a report showing
43、the results of tests for composition of each heat. This report shall include the purchase order number, heat number, AMS 4973F, size, and quantity. 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 o
44、n the results of testing 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 and no additional testing shall be permitted. Results of all tests shall be reported
45、. 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be as follows: 5.1.1 Forgings In accordance with AMS 2808. 5.1.2 Forging Stock As agreed upon by purchaser and vendor. 5.2 Packaging The product shall be prepared for shipment in accordance with commercial practice and in compliance with applica
46、ble 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 purchase orders. 7. R
47、EJECTIONS Product not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been
48、 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 editorial changes only. SAE AMS 4973F -
49、 7 - 8.2 An oxygen-rich layer, such as alpha case, is hard and brittle and results in marked lowering of fatigue properties. 8.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. 8.4 Terms used in AMS are clarified in ARP1917. 8.5 Terminology relating to titanium microstructures is presented in AS1814. 8.6