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/AMS6936B AEROSPACE MATERIAL SPECIFICATION AMS6936 REV. B Issued 2004-01 Revised 2
5、015-07 Superseding AMS6936A Titanium Alloy Bars, Forgings and Forging Stock 6Al - 6V - 2Sn Annealed (Composition similar to UNS R56620) RATIONALE AMS6936B results from a Five Year Review and update of this specification that includes the removal of sample size allowance for hydrogen of Table 1 (cove
6、red by ASTM E1447), requires agreement on mechanical property values for material outside specification ranges (3.5.1.1.7 and 8.6), the addition of AS6279 (3.8) and revises the report paragraph (4.4). 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of bars up through 4.000 i
7、nches (101.60 mm) in nominal diameter or least distance between parallel sides, inclusive, forgings of thickness up through 4.000 inches (101.60 mm), inclusive, with bars and forgings having a maximum cross-sectional area of 32 square inches (204.5 cm2), and stock for forging of any size (See 8.6).
8、1.2 Application These products have been used typically for parts which require high mechanical properties in the annealed condition and a high strength to weight ratio up to 750 F (399 C), but usage is not limited to such applications. 1.2.1 Certain processing procedures and service conditions may
9、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 extent specified herein. Th
10、e 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. SAE INTERNATIONAL AMS6936B Page 2 of 8 2.1
11、SAE Publications 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 Wir
12、e AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS2368 Sampling and Testing of Wrought Titanium Raw Materials, Except Forging and Forging Stock AMS2631 Ultrasonic Inspection, Titanium and Titanium Alloy Bar and Billet AMS2643 Structural Examination of Titanium Alloys, Chemica
13、l Etch Inspection AMS2750 Pyrometry AMS2808 Identification, Forgings AMS2809 Identification, Titanium and Titanium Alloy Wrought Products ARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products AS6279 Production, Distribution, and Procurement of Metal Stock 2.2 ASTM Publicatio
14、ns 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 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Tec
15、hnique 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 Reactive Metals and Their Alloys by Combustion Analysis ASTM E2371 Analysis of Titanium and Titanium
16、 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 shall be determined in accordance with ASTM E1941, hydrogen in accordance with ASTM E1447, oxygen
17、 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 AMS6936B Page 3 of 8 Table 1 - Composition Element min max Aluminum 5.00 6.00 Vanadium 5.00 6.00 Tin 1.50 2.50 Iron 0.
18、35 1.00 Copper 0.35 1.00 Oxygen - 0.20 Carbon - 0.05 Nitrogen - 0.04 (400 ppm) Hydrogen - 0.015 (150 ppm) Yttrium (3.1.1) - 0.005 ( 50 ppm) Other Elements each (3.1.1) - 0.10 Other Elements, total (3.1.1) - 0.30 Titanium remainder 3.1.1 Determination not required for routine acceptance. 3.1.2 Check
19、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 plasma arc cold hearth melting practice. The sub
20、sequent 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 or helium at an absolute pressure not higher than 1000 mm
21、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 Hot finished with or without subsequent cold reduction, annealed, and descaled. A machined or ground surface is per
22、mitted unless prohibited by the purchaser. The product shall be processed to the final thickness/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 S
23、tock for Forging As ordered by the forging manufacturer. 3.4 Heat Treatment Bars and forgings shall be annealed as follows: Pyrometry shall be in accordance with AMS2750. SAE INTERNATIONAL AMS6936B Page 4 of 8 3.4.1 Heat to a temperature 1300 to 1450 F (704 to 788 C) hold at the selected temperature
24、 within 25 F (14 C) for a time commensurate with section thickness and the heating equipment and procedure used, and cool at a rate equivalent to an air cool. 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 specif
25、ied in Table 2, determined in accordance with ASTM E8/E8M 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. 3.5.1.1.1 Tensile property requirements apply in
26、 both the longitudinal and transverse directions. Transverse tensile properties of Table 2 apply only to product 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 sp
27、ecimen within 15 degrees of parallel to the grain flow. 3.5.1.1.3 Yield strength and reduction of area requirements do not apply to product under 0.125 inch (3.18 mm) in nominal diameter or least distance between parallel sides. 3.5.1.1.4 Table 2 properties are limited to product with a maximum cros
28、s-sectional area of 32 square inches (204.5 cm2). 3.5.1.1.5 Maximum yield strength shall not exceed the minimum yield strength by more than 25 ksi. Table 2 - Minimum tensile properties (see 8.2) Nominal Diameter or Least Distance Between Parallel Sides Inch (mm) Tensile Strength ksi (MPa) Yield Stre
29、ngth At 0.2% Offset ksi (MPa) (3.5.1.1.5) Elongation in 2 Inches (50.8 mm) or 4D, % (3.5.1.1.6) Reduction of Area % (3.5.1.1.6) Up to 1.50 ( 38.10), incl. 148 (1020) 137 (994) 10 20 Over 1.50 ( 38.10) to 3.00 ( 76.20), incl. 143 ( 986) 131 (903) 10 20 Over 3.00 ( 76.20) to 4.00 (101.60), incl. 137 (
30、 944) 129 (889) 10 8 20 15 3.5.1.1.6 Values in brackets apply to the short transverse direction for short transverse dimensions of 3.00 inches (76.2 mm) or greater. 3.5.1.1.7 Mechanical property requirements for product outside the size range covered by 3.5.1.1.4 and Table 2 shall be agreed upon bet
31、ween 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 continuous
32、 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 AMS6936B Page 5 of 8 3.5.1.3 Surface Contamination Ex
33、cept 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 microscopic examination at not lower than 400X magnification or by other method agreed upon by purchaser and producer. 3.5.1.3.1 When permit
34、ted 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 materials and from inter
35、nal 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 the stock after h
36、eat 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 imperfections detriment
37、al 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 or stricter requirements of AMS2631. Product over 1.500 inches (38.10 mm) in nominal
38、thickness, diameter or least distance between parallel sides shall meet Class A or stricter requirements of AMS2631. 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. This requirement be
39、comes effective September 1, 2016. 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 the right to sample and to perform any
40、confirmatory testing deemed necessary to ensure that the product conforms to the 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. 4.2.1.1 Composition (3.1) of each heat
41、. 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 of bars and forgings. 4.2.1.3 Ultrasonic quality (3.6.1) of each bar, forging, or forging stock. SAE INTERNATIONAL AMS6936B Page 6 of 8
42、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 a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be in accord
43、ance 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 4.3.1.1 Composition At least one sample from each heat, except that for hydrogen determinations, one sample from each lot obtained after all
44、 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 samples from each lot of forgings shall be as agreed upon by purchaser and producer. 4.3.1.3 A specimen at least 0.5 inch (12.7 mm) long by
45、full cross-section from each end of the bars selected for sampling shall be macrostructurally examined for conformance to the quality requirements. Unless otherwise specified, macrostructural examination shall be performed in accordance with AMS2643. The number of bars selected for examination shall
46、 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 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 eac
47、h shipment a report showing producer identity and 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 composition of each heat and for the hydrogen content, tensile properties, microstructure, and surface co
48、ntamination of each lot, ultrasonic quality, and state that the product conforms to the other technical requirements. The report shall include the purchase order number, heat and lot numbers, AMS6936B, product form and mill produced size (and part number, if applicable), specific annealing treatment
49、 used, and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall also be included. 4.4.2 Report the nominal metallurgically worked cross sectional size and the cut size, if different (See 3.3.1). SAE INTERNATIONAL AMS6936B Page 7 of 8 4.4.3 When the product size is outside the range covered by 3.5.1.1.4 and Table 2, the report shall contain a statement to that effect. 4