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/AMS6950 AEROSPACE MATERIAL SPECIFICATION AMS6950 Issued 2017-05 Titanium Alloy Bars, Forgings,
5、and Forging Stock 4Al - 2.5V - 1.5 Fe Single Hearth Melted, Annealed (Composition similar to UNS R54250) RATIONALE AMS6950 is a new specification for single hearth melted, annealed UNS R54250 bar products. 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of bars and forgings
6、14.000 inches (355.60 mm) and under in nominal diameter or least distance between parallel sides and stock for forging. 1.2 Application These products have been used typically for parts requiring a combination of moderate strength and good ductility with a maximum service temperature up to 750 F (40
7、0 C) depending on time at temperature where the product is to be used in the annealed condition, but usage is not limited to such applications. 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 sp
8、ecified 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 Avai
9、lable 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 Chemical Ch
10、eck Analysis Limits Titanium and Titanium Alloys AMS2368 Sampling and Testing of Wrought Titanium Raw Material Except Forgings and Forging Stock AMS2750 Pyrometry SAE INTERNATIONAL AMS6950 Page 2 of 7 AMS2808 Identification Forgings AMS2809 Identification Titanium and Titanium Alloy Wrought Products
11、 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 Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700,
12、 West Conshohocken, PA 19428 -2959, Tel: 610-832-9585, www.astm.org. ASTM E8/E8M Tension Testing of Metallic Materials 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
13、 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 Titanium Alloys by Direct Current Plasma and Inductively Coupled Plasma Atomic Emission Spectrom
14、etry 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 percentages by weight shown in Table 1; carbon shall be determined in accordance with ASTM E19
15、41, hydrogen in accordance with ASTM E1447, oxygen and nitrogen in accordance with ASTM E1409, and other elements in accordance with ASTM E2371 or ASTM E2994. Other analytical methods may be used if acceptable to the purchaser. Table 1 - Composition Element Min Max Aluminum Vanadium Iron Oxygen Carb
16、on Nitrogen Hydrogen 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) SAE INTERNATIONAL AMS6950 Page 3 of 7 3.1.1 Determination not required for routine acceptance. 3.1.2 Ch
17、eck Analysis Composition variations shall meet the applicable requirements of AMS2249. 3.2 Melting Practice Alloy shall be cold hearth melted. Either electron beam cold hearth melting or plasma arc cold hearth melting may be used. 3.2.1 The melt source shall establish effective control procedures, i
18、ncluding parameters for the critical variables that will consistently produce material suitable for the production of bars and forgings meeting the requirements of this specification. 3.3 Condition The product shall be supplied in the following condition: 3.3.1 Bars Hot finished with or without subs
19、equent cold reduction, annealed, and descaled. Unless prohibited by purchaser, bars may be solution heat treated before annealing. The product shall be processed to the final thickness/diameter by metallurgical working operations prior to any dimensional sizing or surface finishing operations (see 8
20、.6). Bar shall not be cut from plate. 3.3.2 Forgings Annealed and descaled. Unless prohibited by purchaser, product may be solution heat treated before annealing. 3.3.3 Stock for Forging As ordered by the forging manufacturer. 3.4 Heat Treatment Bars and forgings shall be heat treated as follows; py
21、rometry shall be in accordance with AMS2750. 3.4.1 Solution Heat Treatment When solution heat treatment is used, heat to a temperature within the range 50 to 200 F (28 to 93 C) below the beta transus, hold at the selected temperature within 25 F (14 C) for a time commensurate with section thickness
22、and the heating equipment and procedure used, and cool at a rate equivalent to an air cool or faster. 3.4.2 Annealing Heat to a temperature within the range 1250 to 1400 F (677 to 760 C), hold at the selected temperature within 25 F (14 C) for not less than 1 hour, and cool as required. 3.5 Properti
23、es The product shall conform to the following requirements and shall also meet the requirements of 3.5.1.1 and 3.5.1.2 after being heated to any temperature up to 1200 F (649 C), held at heat for 20 minutes 3 minutes, cooled in air, and descaled: 3.5.1 Bars and Forgings Product, 14.000 inches (355.6
24、0 mm) and under in nominal diameter or least distance between parallel sides, shall have the following properties: 3.5.1.1 Tensile Properties SAE INTERNATIONAL AMS6950 Page 4 of 7 Shall be as specified in Table 2, determined in the longitudinal direction in accordance with ASTM E8/E8M on specimens a
25、s in 4.3.1.2 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 2 Table 2A - Minimum tensile properties, inch/pound units Nominal Diameter or Least Dis
26、tance Between Parallel Sides Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 Inches or 4D % Reduction of Area % L T Less than 2.000 139 125 15 30 25 2.000 to less than 5.000 135 125 15 30 22 5.000 to 14.000, incl 129 122 12 24 10 Table 2B - Minimum tensile properties, S
27、I units 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 % L T Less than 50.80 958 862 15 30 25 50.80 to less than 127.00 931 862 15 30 22 127.00 to 355.60, incl 889 841 12 24
28、10 3.5.1.1.1 Specimens for the longitudinal requirements in 3.5.1.1 shall be taken with the axis of the specimen approximately parallel to the grain flow for forgings. 3.5.1.1.2 Mechanical property requirements for product outside the size range covered by 1.1 shall be agreed upon between purchaser
29、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, 3.5.1.2.2, or 3.5.1.2.3. 3.5.1.2.1 Equiaxed and/or elongated primary alpha in a transformed beta matrix with no continuous network of a
30、lpha 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. 3.5.1.2.3 Partially broken and distorted grain boundary alpha with plate-like alpha. 3.5.1.2.4 A microstructure showing a c
31、ontinuous network of alpha in prior beta grain boundaries is not acceptable. 3.5.1.3 Surface Contamination Except as permitted by 3.5.1.3.1 and 3.5.1.3.2, the product shall be free of any oxygen-rich layer (see 8.2), such as alpha case, or other surface contamination, determined by microscopic exami
32、nation at not lower than 100X magnification or other method acceptable to purchaser. SAE INTERNATIONAL AMS6950 Page 5 of 7 3.5.1.3.1 An oxygen-rich layer not greater than 0.001 inch (0.025 mm) in depth will be permitted on bars other than round. 3.5.1.3.2 When permitted by purchaser, forgings to be
33、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 having a degree of mechanical working not greater than the forging and heat treated as in 3.4, specime
34、ns taken from the heat-treated coupon shall conform to the requirements of 3.5.1.1. If specimens taken from 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
35、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-line end grain, shall follow the general contour of the forgings showing no ev
36、idence of reentrant grain flow. 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 supp
37、ly all samples for producers test 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 Accep
38、tance Tests The following 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 and hydrogen content of each lot. 4.2.1.2 Tensile properties (3.5.1.1), microstructure (3.5.1.2), and surface contamination (3.5.1.3) of each l
39、ot of bars and forgings. 4.2.1.3 Tolerances (3.7) of bars. 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 Ability of forging stock (3.5.2) to develop requ
40、ired properties. 4.2.2.2 Grain flow of die forgings (3.6.1). SAE INTERNATIONAL AMS6950 Page 6 of 7 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 solution heat tre
41、ated and annealed as a 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 from each lot obtained after thermal and chemical processing is completed. 4.3.1.2 Tensile Properties At least one sample from bars fr
42、om each lot. The number, location, and orientation of samples from each lot of forgings shall be as agreed upon by purchaser and producer. 4.3.1.3 Microstructure and Surface Contamination At least one sample from each lot. 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report show
43、ing producer identity, country where the metal was melted (e.g., 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 and tensile properties of each lot, and state that the product conforms to the ot
44、her technical requirements. This report shall include the purchase order number, lot number, AMS6950, product form and mill produced size (and/or part number, if applicable), specific heat treatment used, and quantity. If forgings are supplied, the part number and the size of stock used to make the
45、forgings shall also be included. The producer of stock for forging 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 operations) and the results of tests for chemical compositio
46、n of each heat. This report shall include the purchase order number, heat number, AMS6950, size, and quantity. 4.4.2 Report the nominal metallurgically worked cross sectional size and the cut size, if different (also see 3.3.1 and 8.6). 4.4.3 When the bar or forging is outside the range covered by 1
47、.1, the report shall contain a statement to that effect. 4.5 Resampling and Retesting In accordance with AMS2368. 5. PREPARATION FOR DELIVERY 5.1 Identification 5.1.1 Bars In accordance with AMS2809. 5.1.2 Forgings In accordance with AMS2808. 5.1.3 Stock for Forging As agreed upon by purchaser and p
48、roducer. 5.2 Packaging The product shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the product to ensure carrier acceptance and safe delivery. SAE INTERNATIONAL
49、AMS6950 Page 7 of 7 6. ACKNOWLEDGMENT A producer shall include this specification number in all quotations and when acknowledging purchase orders. 7. REJECTIONS Product not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 Revision Indicator A change bar (l) located in the left margin is for the convenience of the user in locating areas whe
