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 2015 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:/www.sae.org/technical/standards/AMS6947A AEROSPACE MATERIAL SPECIFICATION AMS6947 REV. A Issued 2011-07 Revised 2
5、015-07 Superseding AMS6947 Titanium Alloy, Bars, Wire, Forgings, Rings, and Drawn Shapes 4Al - 2.5V -1.5 Fe Annealed, Heat Treatable (Composition similar to UNS R54250) RATIONALE AMS6947A results from a Five Year Review and update of this specification that requires agreement on mechanical property
6、values for material outside specification ranges (3.5.1.2.2 and 8.6), the addition of AS6279 (3.8), adds AMS2368 (4.3 and 4.5) and revises the report paragraph (4.4). 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of bars, wire, forgings, flash welded rings, drawn shapes 4.
7、000 inches (101.60 mm) and under, and stock for forging, heading, or flash welded rings of any size. 1.2 Application These products have been used typically for parts to be rough machined prior to solution and precipitation heat treatment and for parts, such as pressure vessels and other aerospace s
8、tructures, requiring high strength-to-weight ratios at or near room temperature, 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
9、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 may work to a subsequent revision of a document unless a specific document issue is specified. Whe
10、n the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. SAE INTERNATIONAL AMS6947A Page 2 of 8 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 87
11、7-606-7323 (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 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS2368 Sampling and Testing of Wrough
12、t Titanium Raw Material except Forgings and Forging Stock AMS2750 Pyrometry AMS2808 Identification Forgings AMS2809 Identification, Titanium and Titanium Alloy Wrought Products AMS7498 Rings, Flash Welded, Titanium and Titanium Alloys ARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium A
13、lloy Products AS6279 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/E8M Tension Testing of Metallic Materials ASTM E1409
14、 Determination of Oxygen and Nitrogen 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 Rea
15、ctive 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 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1; carbon
16、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 E2371. Other analytical methods may be used if acceptable to the purchaser. SAE INTERNATIONAL AMS6947A Page 3 of 8
17、Table 1 - Composition Element min max Aluminum Vanadium Iron Oxygen Carbon Nitrogen Hydrogen (3.1.2) Other Elements, each (3.1.1) Other Elements, total (3.1.1) Titanium 3.5 2.0 1.2 0.20 - - - - - remainder 4.5 3.0 1.8 0.30 0.08 0.03 0.015 0.1 0.3 (800 ppm) (300 ppm) (150 ppm) 3.1.1 Determination not
18、 required for routine acceptance. 3.1.2 Check Analysis Composition variations shall meet the applicable 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 pl
19、asma arc cold 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 nonconsumable electrode melting shall be vacuum or shall be argon and/or heliu
20、m at an absolute 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 Bars and Drawn Shapes Hot finished with or without subsequent cold red
21、uction, annealed, and descaled. Unless prohibited by purchaser, bars may be solution heat treated below the beta transus prior to annealing. The product shall be processed to the final thickness/diameter by metallurgical working operations prior to any dimensional sizing or surface finishing operati
22、ons. Bar shall not be cut from plate. 3.3.2 Wire Hot finished with or without subsequent cold reduction, annealed, and descaled. 3.3.3 Forgings and Flash Welded Rings Annealed and rough machined or descaled. 3.3.3.1 Flash welded rings shall not be supplied unless specified or permitted on purchasers
23、 part drawing. When supplied, rings shall be manufactured in accordance with AMS7498. 3.3.4 Stock for Forging, Flash Welded Rings, or Heading As ordered by the forging, flash welded ring, or heading manufacturer. SAE INTERNATIONAL AMS6947A Page 4 of 8 3.4 Annealing Bars, wire, forgings, rings, and d
24、rawn shapes shall be annealed by heating to a temperature within the range 1250 to 1400 F (677 to 760 C), holding at the selected temperature within 25 F (14 C) for not less than 1 hour, and cooling at a rate that will produce product meeting the requirements of 3.5. Pyrometry shall be in accordance
25、 with AMS2750. 3.5 Properties The product shall conform to the following requirements: 3.5.1 Bars, Wire, Forgings, Flash Welded Rings, and Drawn Shapes 3.5.1.1 As Annealed 3.5.1.1.1 Microstructure Shall be that structure resulting from processing within the alpha-beta field. Microstructure shall con
26、form to 3.5.1.1.1.1 or 3.5.1.1.1.2. 3.5.1.1.1.1 Equiaxed and/or elongated primary alpha in a transformed beta matrix with no continuous network of alpha at prior beta grain boundaries. 3.5.1.1.1.2 Essentially complete field of equiaxed and/or elongated alpha with no continuous network of alpha at pr
27、ior beta grain boundaries. 3.5.1.1.1.3 A microstructure showing a continuous network of alpha in prior beta grain boundaries is not acceptable. 3.5.1.1.2 Surface Contamination Except as specified in 3.5.1.1.2.1 and 3.5.1.1.2.2, the product shall be free of any oxygen-rich layer (See 8.2), such as al
28、pha case, or other surface contamination, determined by microscopic examination at not lower than 400X magnification or by other method acceptable to purchaser. 3.5.1.1.2.1 An oxygen-rich layer not greater than 0.001 inch (0.025 mm) in depth will be permitted on bars other than rounds. 3.5.1.1.2.2 W
29、hen permitted by purchaser, forgings and flash welded rings to be machined all over may have an oxygen-rich layer provided such layer is removable within the machining allowance. 3.5.1.2 After Solution and Precipitation Heat Treatment Product, 4.000 inches (101.60 mm) and under in nominal diameter o
30、r least distance between parallel sides, shall have the following properties after being solution heat treated by heating in a suitable atmosphere within the range 1600 to 1650 F 25 (871 to 899 C 14), holding at heat for 1 to 2 hours, and quenching in agitated water and precipitation heat treated by
31、 heating within the range 800 to 900 F 15 (427 to 482 C 8), holding at heat for at least 8 hours, and cooling in air. 3.5.1.2.1 Tensile Properties Shall be as shown in Table 2, determined in the longitudinal direction in accordance with ASTM E8/E8M with the rate of strain set at 0.005 inch/inch/minu
32、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. SAE INTERNATIONAL AMS6947A Page 5 of 8 Table 2A - Minimum tensile properties, inch/pound units Nominal Diameter or Least Distance Between Parallel Sides Inch
33、es Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 4D % Reduction of Area % Up to 0.500 0.500 to less than 1.000 1.000 to less than 1.500 1.500 to less than 2.000 2.000 to 4.000, incl 170 160 155 150 145 150 144 138 135 130 10 10 10 10 10 20 20 20 20 20 Table 2B - Minimum tensil
34、e properties, SI units Nominal Diameter or Least Distance Between Parallel Sides Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 4D % Reduction of Area % Up to 12.70 12.70 to less than 25.40 25.40 to less than 38.10 38.10 to less than 50.80 50.80 to 101.60, incl 1172
35、 1103 1069 1034 1000 1034 993 952 931 896 10 10 10 10 10 20 20 20 20 20 3.5.1.2.1.1 Yield strength and reduction of area requirements do not apply to wire under 0.125 inch (3.18 mm) in nominal diameter or least distance between parallel sides. 3.5.1.2.1.2 Specimens from bars, wire, forgings, and dra
36、wn shapes shall have the axis of specimen in the area of the gage length varying not more than 15 degrees from parallel to the grain flow for the longitudinal requirements of Table 2, and specimens shall be taken in the circumferential direction from flash welded rings. 3.5.1.2.2 Mechanical property
37、 requirements for product outside the size range covered by 1.1 shall be agreed upon between purchaser and producer. 3.5.2 Forging Stock A sample of stock shall be forged to a test coupon and heat treated as in 3.5.1.2, and specimens taken from the heat treated coupon shall conform to the requiremen
38、ts of 3.5.1.2.1. Alternately specimens taken from stock after heat treatment as in 3.5.1.2 that conform to the requirements of 3.5.1.2.1 shall be accepted as equivalent to tests of a forged coupon. 3.5.3 Stock for Flash Welded Rings or Heading A sample of stock heat treated as in 3.5.1.2 shall confo
39、rm to the requirements of 3.5.1.2.1. 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. 3.6.1 Grain flow of die forgings, except in areas that contain flash-l
40、ine end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain flow. 3.7 Tolerances Bars and wire shall conform to all applicable requirements of AMS2241. 3.8 Production, distribution, and procurement of metal stock shall comply with AS6279. This requirement b
41、ecomes effective September 1, 2016. SAE INTERNATIONAL AMS6947A Page 6 of 8 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
42、 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 acceptance tests and shall be performed on each heat or lot as applicable: 4.
43、2.1.1 Composition (3.1) of each heat. 4.2.1.2 Hydrogen content (3.1) of each lot of bars, wire, forgings, flash welded rings, drawn shapes, forging stock, stock for flash welded rings and heading, microstructure (3.5.1.1.1), and surface contamination (3.5.1.1.2) of each lot of bars, wire, forgings,
44、flash welded rings, and drawn shapes as annealed. 4.2.1.3 Tensile properties (3.5.1.2.1) of each lot of bars, wire, forgings, flash welded rings, and drawn shapes after solution and precipitation heat treatment. 4.2.1.4 Tolerances (3.7) of bars and wire. 4.2.2 Periodic Tests Tests to determine abili
45、ty of forging stock (3.5.2) and of stock for flash welded rings or heading (3.5.3) to develop required properties are periodic tests and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be in accordance w
46、ith 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 annealed in the same heat treat batch. 4.3.1 For Acceptance Tests 4.3.1.1 Composition One sample from each heat, except that for hydrogen determinations one sample fro
47、m each lot obtained after thermal and chemical processing is completed. 4.3.1.2 Tensile Properties At least one sample from bars, wire, flash welded rings, and drawn shapes from each lot. One longitudinal specimen from each lot of forgings from a section having maximum thickness and from a section h
48、aving minimum thickness. 4.3.1.2.1 Specimens from flash welded rings shall be cut from parent metal not including the weld-heat-affected zone. 4.3.1.3 Microstructure and surface contamination evaluation shall be made on at least one specimen from each lot prepared metallographically. Machined or cen
49、terless ground bar to be used for forging stock need not be sampled for microstructure or surface contamination. 4.3.1.4 Other Requirements As agreed upon by purchaser and producer. SAE INTERNATIONAL AMS6947A Page 7 of 8 4.3.2 For Periodic Tests As agreed upon by purchaser and producer. 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report showing producer identity, country where the metal was melte
