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/AMS6931D AEROSPACE MATERIAL SPECIFICATION AMS6931 REV. D Issued 2004-01 Revised 2017-12 Superse
5、ding AMS6931C Titanium Alloy Bars, Forgings and Forging Stock 6.0Al - 4.0V Annealed (Composition similar to UNS R56400) RATIONALE AMS6931D results from a Five-Year Review and update of this specification that includes the addition of ASTM E2994 (3.1), removal of sample size allowance for hydrogen of
6、 Table 1 (covered by ASTM E1447), increases section size limits (3.5), revises reporting (4.4) and marking (5.1). 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of bars and forgings up through 10.000 inches (254.00. mm), inclusive, in diameter or least distance between para
7、llel sides with a maximum cross-sectional area of 79.0 in2 (506.45 cm2) and forging stock of any size (see 8.7). 1.2 Application These products have been used typically for parts requiring moderate strength with a maximum service temperature in the 750 to 900 F (399 to 510 C) range depending on time
8、 at temperature where the product is to be used in the annealed condition, but usage is not 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 c
9、onditions. 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 may work to a subsequent revision of a document unless a specific document issue is specified. When the
10、referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. SAE INTERNATIONAL AMS6931D Page 2 of 8 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-
11、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 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS2368 Sampling and Testing of Wrought Tita
12、nium Raw Material, Except Forgings and Forging Stock AMS2631 Ultrasonic Inspection, Titanium and Titanium Alloy Bar and Billet AMS2643 Structural Examination of Titanium Alloys, Chemical Etch Inspection AMS2750 Pyrometry AMS2808 Identification, Forgings AMS2809 Identification, Titanium and Titanium
13、Alloy Wrought Products 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 Industry Standard Practices for Production, Distribution, and Procuremen
14、t 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/E8M Tension Testing of Metallic Materials ASTM E539 Analysis of Titanium Alloys by X-Ray Fluorescence Spectrometr
15、y ASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by Inert Gas Fusion 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 React
16、ive Metals and Their Alloys by Combustion Analysis ASTM E2371 Analysis of Titanium and Titanium 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 Ato
17、mic Emission Spectrometry SAE INTERNATIONAL AMS6931D Page 3 of 8 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 E1941, hydrogen in accordance with ASTM E1447, oxygen and nitrogen in accordance
18、with ASTM E1409, and other elements in accordance with ASTM E539, ASTM E2371 or ASTM E2994. 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 pp
19、m) Hydrogen - 0.0125 (125 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 required for routine acceptance. 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of A
20、MS2249. 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 arc remelting (VAR) practi
21、ce. Alloy additions are not permitted in the final melt cycle. 3.2.1 The atmosphere for nonconsumable electrode melting shall be vacuum or shall be argon 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-c
22、ooled copper. 3.3 Condition The product shall be supplied in the following condition: 3.3.1 Bars Hot finished with or without subsequent cold reduction, annealed, and descaled. A machined or ground surface is permitted unless prohibited by the purchaser. The product shall be processed to the final t
23、hickness/diameter by metallurgical working operations prior to any straightening, dimensional sizing or surface finishing operations. Bar shall not be cut from plate. 3.3.2 Forgings Annealed and descaled. 3.3.3 Stock for Forging As ordered by the forging manufacturer. SAE INTERNATIONAL AMS6931D Page
24、 4 of 8 3.4 Heat Treatment Bars and forgings shall be annealed at 1300 to 1450 F (704 to 788 C) holding at the selected temperature within 25 F (14 C) for a time commensurate with section thickness and the heating equipment and procedure used, and cooled at a rate equivalent to an air cool. Pyrometr
25、y shall be in accordance with AMS2750. 3.5 Properties The product shall conform to the following requirements: 3.5.1 Bars and Forgings 3.5.1.1 Tensile Properties Shall be as specified in Table 2, determined in accordance with ASTM E8/E8M with the rate of strain maintained set at 0.005 inch/inch/minu
26、te (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. 3.5.1.1.1 Tensile property requirements apply in both the longitudinal and transverse directions. Transverse tensile properties of Table 2 apply only to prod
27、uct that a test specimen not less than 2.50 inches (63.5 mm) in length can be obtained. 3.5.1.1.2 Specimens for the longitudinal requirements in Table 2 shall be taken with the axis of the specimen within 15 of parallel to the grain flow. 3.5.1.1.3 Yield strength and reduction of area requirements d
28、o not apply to product under 0.125 inch (3.18 mm) in nominal diameter. 3.5.1.1.4 Table 2 properties are limited to product with a maximum cross-sectional area of 79.0 in2 (506.45 cm2). Table 2 - Minimum tensile properties (see 8.2) Nominal Diameter or Least Distance Between Parallel Sides Inches (mm
29、) Tensile Strength ksi (MPa) Yield Strength At 0.2% Offset ksi (MPa) Elongation in 2 Inches (50.8 mm) or 4D, % (3.5.1.1.5) Reduction of Area % (3.5.1.1.5) Up to 4.00 (101.50), incl 130 (896) 120 (827) 10 25 Over 4.00 (101.50) to 6.00 (152.40), incl 130 (896) 120 (827) 10 8 20 15 Over 6.00 (152.40) t
30、o 10.00 (254.00) 130 (896) 119 (820) 10 8 20 15 3.5.1.1.5 Values in brackets apply to the short transverse direction for short transverse dimensions of 3.00 inches (76.2 mm) or greater. 3.5.1.1.6 Mechanical property requirements for product outside the size range covered by 1.1 shall be agreed upon
31、between purchaser and producer. 3.5.1.2 Microstructure Shall be that structure resulting from processing within the alpha-beta phase field. Microstructure shall conform to 3.5.1.2.1 or 3.5.1.2.2 (see 8.3). 3.5.1.2.1 Equiaxed and/or elongated primary alpha in a transformed beta matrix with no continu
32、ous network of alpha at prior beta grain boundaries. 3.5.1.2.2 Essentially complete field of equiaxed and/or elongated alpha with or without intergranular beta and with no continuous network of alpha at prior beta grain boundaries. SAE INTERNATIONAL AMS6931D Page 5 of 8 3.5.1.3 Surface Contamination
33、 Except as specified in 3.5.1.3.1, the product shall be free of any oxygen-rich layer (see 8.4), such as alpha case, or other surface contamination, determined by examination of a metallographic cross section at 400X minimum magnification or by other method agreed upon by purchaser and producer. 3.5
34、.1.3.1 When permitted by purchaser, product to be machined all over may have an oxygen-rich layer, provided such layer is removable within the machining allowance on the product. 3.5.1.4 Macrostructure Product shall be uniform in quality and condition, homogenous, sound, and free from foreign materi
35、als and from internal imperfections detrimental to fabrication or performance of parts. 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 heat treated coupon shall conform to the requirements of 3.5.1.1. If specimens taken from
36、 the stock after heat treatment as in 3.4 conform to the requirements of 3.5.1.1, 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 imper
37、fections detrimental to usage of the product. 3.6.1 Ultrasonic Inspection Product 0.500 inch (12.70 mm) to 1.500 inches (38.10 mm) inclusive in nominal thickness, diameter or least distance between parallel sides shall meet Class A1 requirements of AMS2631. Product over 1.500 inches (38.10 mm) in no
38、minal thickness, diameter or least distance between parallel sides shall meet Class A requirements of AMS2631. If product passes a more stringent class, there is no need to re-test or re-certify if the specification requirement is less stringent (e.g. inspection to class AA satisfies a class A1 requ
39、irement). 3.7 Tolerances Bars shall conform to all 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 pro
40、ducers 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 The follo
41、wing requirements 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), tensile properties (3.5.1.1), microstructure (3.5.1.2), surface contamination (3.5.1.3), and macrostructure (3.5.1.4) of each lot o
42、f bars and forgings. 4.2.1.3 Ultrasonic quality (3.6.1) of each bar, forging, or forging stock. SAE INTERNATIONAL AMS6931D Page 6 of 8 4.2.1.4 Tolerances (3.7) of bars. 4.2.2 Periodic Tests Ability of forging stock (3.5.2) to develop specified properties is a periodic test and shall be performed at
43、a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be in accordance with AMS2368 and as follows: 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
44、.1 Composition At least one sample from each heat, except that for hydrogen determinations, one sample from each lot obtained after all thermal and chemical processing is completed. 4.3.1.2 Tensile Properties At least one sample from bars from each lot. The number, location, and orientation of sampl
45、es from each lot of forgings shall be as agreed upon by purchaser and producer. 4.3.1.3 Macrostructure A specimen at least 0.5 inch (12.7 mm) long by full cross-section from each end of the bars selected for sampling shall be macrostructurally examined for conformance to the quality requirements. Un
46、less otherwise specified, macrostructural examination shall be performed in accordance with AMS2643. The number of bars selected for examination shall not be less than the amounts shown in Table 3. Table 3 - Number of bars selected for macrostructural examination Number of Bars in Lot Number of Bars
47、 Selected 1 to 15 1 16 to 50 2 51 to 150 3 151 to 500 5 over 500 4 + amount shown above over 500 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report showing producer identity, country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting
48、 operations), the results of tests for composition of each heat and for the hydrogen content, tensile properties, microstructure, and surface contamination of each lot, ultrasonic quality of product 0.500 inches (12.70 mm) and over and state that the product conforms to the other technical requireme
49、nts. The report shall include the purchase order number, heat and lot numbers, AMS6931D, product form and mill produced size (and/or part number, if applicable) specific annealing treatment used, and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall also be included. The producer of stock for forging or flash welded rings shall furnish with
