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/AMS4939C AEROSPACE MATERIAL SPECIFICATION AMS4939 REV. C Issued 2003-04 Revised 2017-03 Superse
5、ding AMS4939B Titanium Alloy Sheet, Strip, and Plate 3Al - 8V - 6Cr - 4Mo - 4Zr Solution Heat Treated (Composition similar to UNS R58640) RATIONALE AMS4939C results from a Five-Year Review and update of this specification that includes the addition of ASTM E2994 (3.1), removal of sample size allowan
6、ce for hydrogen of Table 1 (covered by ASTM E1447), requires agreement on mechanical property values for material outside specification ranges (3.5.3), recognizes that stricter ultrasonic testing meets requirement (3.6.1, 8.6), the addition of AS6279 (3.8), and revises Reporting (4.4) and Resampling
7、 (4.5). 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of sheet, strip, and plate through 4.000 inches (101.60 mm) nominal thickness. 1.2 Application This material has been used typically for parts to be formed or machined in the solution heat treated condition and subseque
8、ntly precipitation heat treated requiring high strength-to-weight ratio and stability up to 550 F (288 C) in the precipitation heat treated condition, but usage is not limited to such applications. 1.3 Certain processing procedures and service conditions may cause these products to become subject to
9、 stress-corrosion cracking; ARP982 recommends practices to minimize such conditions. SAE INTERNATIONAL AMS4939 C Page 2 of 8 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
10、 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 Available from SAE Inte
11、rnational, 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. AMS2242 Tolerances Corrosion and Heat Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Sheet, Strip, and Plate AMS2249 Chemical Check Analys
12、is Limits Titanium and Titanium Alloys AMS2368 Sampling and Testing of Wrought Titanium Raw Material Except Forgings and Forging Stock AMS2631 Ultrasonic Inspection Titanium and Titanium Alloy Bar, Billet and Plate AMS2750 Pyrometry AMS2809 Identification Titanium and Titanium Alloy Wrought Products
13、 ARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS1814 Terminology for Titanium Microstructures AS4194 Sheet and Strip Surface Finish Nomenclature AS6279 Standard Practice for Production, Distribut
14、ion, 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 A480/A480M General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet,
15、and Strip ASTM E8/E8M Tension Testing of Metallic Materials ASTM E290 Bend Testing of Material for Ductility ASTM E384 Microindentation Hardness of Materials ASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by Inert Gas Fusion ASTM E1447 Determination of Hydrogen in Ti
16、tanium and Titanium Alloys by the Inert Gas Fusion Thermal Conductivity/Infrared Detection Method SAE INTERNATIONAL AMS4939 C Page 3 of 8 ASTM E1941 Determination of Carbon in Refractory and Reactive Metals and Their Alloys by Combustion Analysis ASTM E2371 Analysis of Titanium and Titanium Alloys b
17、y 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 Atomic Emission Spectrometry 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by
18、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 with ASTM E1409, and other elements in accordance with ASTM E2371 or ASTM E2994. Other analytical methods may be used if acceptable to the purc
19、haser. Table 1 - Composition Min Max Vanadium 7.50 8.50 Chromium 5.50 6.50 Molybdenum 3.50 4.50 Zirconium 3.50 4.50 Aluminum 3.00 4.00 Iron - 0.30 Oxygen - 0.12 Carbon - 0.05 Nitrogen - 0.03 Hydrogen - 0.020 (200 ppm) Yttrium (3.1.1) - 0.005 ( 50 ppm) Other Elements, each (3.1.1) - 0.15 Other Elemen
20、ts, 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 AMS2249. 3.2 Melting Practice Alloy shall be multiple melted. The first melt shall be made by vacuum consumable e
21、lectrode, nonconsumable electrode, electron beam cold hearth, or plasma 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 VAR melt. 3.2.1 The atmosphere for non-consumabl
22、e electrode melting shall be vacuum or shall be argon and/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-cooled copper. SAE INTERNATIONAL AMS4939 C Page 4 of 8 3.3 Condition The product shall be supplie
23、d in the following condition: 3.3.1 Sheet and Strip Hot rolled, with or without subsequent cold reduction, solution heat treated, descaled, and leveled, having a surface appearance comparable to a commercial corrosion-resistant steel No. 2D finish (see 8.2). 3.3.2 Plate Hot rolled, solution heated,
24、and flattened, having a surface appearance comparable to a commercial corrosion-resistant steel No. 1 finish (see 8.2). Plate product shall be produced using standard industry practices designed strictly for the production of plate stock to the procured thickness. Bar, billet, forgings, or forging s
25、tock shall not be supplied in lieu of plate. 3.4 Heat Treatment The product shall be solution heat treated by heating to a temperature within the range 1450 to 1700 F (788 to 927 C), holding at the selected temperature within 25 F (14 C) for a time commensurate with product thickness and the heating
26、 equipment and procedure used, and cooling at a rate that will produce product meeting the requirements of 3.5. Pyrometry shall be in accordance with AMS2750. 3.5 Properties The product shall conform to the following requirements: 3.5.1 As Solution Heat Treated 3.5.1.1 Tensile Properties Shall be as
27、 specified in Table 2, determined in accordance with ASTM E8/E8M with the rate of strain set at 0.005 in/in/min (0.005 mm/mm/min) and maintained within a tolerance of 0.002 in/in/min (0.002 mm/mm/min) through the 0.2% offset yield strain. Table 2 Table 2A - Minimum tensile properties, inch/pound uni
28、ts (see 8.3) Nominal Thickness Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 Inches or 4D % Up to 0.029, incl 125 120 (3.5.1.1.1) 6 Over 0.029 to 0.1874, incl 125 120 (3.5.1.1.1) 8 Over 0.1874 to 1.999, incl 125 120 10 (8) (3.5.1.1.2) Over 1.999 to 4.000, incl 120 115
29、 8 (6) (3.5.1.1.2) Table 2B - Minimum tensile properties, SI units (see 8.3) Nominal Thickness Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 50.8 mm or 4D % Up to 0.74, incl 862 827 (3.5.1.1.1) 6 Over 0.74 to 4.76, incl 862 827 (3.5.1.1.1) 8 Over 4.76 to 50.77, inc
30、l 862 827 10 (8) (3.5.1.1.2) Over 50.77 to 101.60, incl 827 793 8 (6) (3.5.1.1.2) SAE INTERNATIONAL AMS4939 C Page 5 of 8 3.5.1.1.1 Yield strength value is a maximum for this size in the Solution Treated Condition. 3.5.1.1.2 Elongation value in parentheses applies in the transverse direction only. 3
31、.5.1.2 Bending Product under 0.1875 inch (4.762 mm) in nominal thickness shall have a test sample prepared nominally 0.750 inch (19.06 mm) in width with its axis of bending parallel to the direction of rolling. The sample shall be bend tested in conformance with the guided bend test defined in ASTM
32、E290 through an angle of 105. The test fixture supports shall have a contact radius 0.010 minimum, and the plunger shall have a radius equal to the bend factor shown in Table 3 times the nominal thickness. Examination of the bent sample shall not show evidence of cracking when examined at 15 to 25X
33、magnification. Table 3 - Bend factor Nominal Thickness Inch Nominal Thickness Millimeters Bend Factor Up to 0.070, incl Over 0.070 to 0.1875, excl Up to 1.78, incl Over 1.78 to 4.762, excl 3 3.5 3.5.1.3 Surface Contamination The product shall be free of any oxygen-rich layer, such as alpha case, or
34、other surface contamination, determined as in any one of the following: 3.5.1.3.1, 3.5.1.3.2, 3.5.1.3.3, or other method acceptable to purchaser. 3.5.1.3.1 The bend test of 3.5.1.2. 3.5.1.3.2 Microscopic examination at 400X minimum. 3.5.1.3.3 Hardness difference; a surface hardness more than 40 poin
35、ts higher than the subsurface hardness, determined in accordance with ASTM E384 on the Knoop scale using a 200 g load, being evidence of unacceptable surface contamination. 3.5.2 Response to Precipitation Heat Treatment Product shall conform to the following requirements after being precipitation he
36、at treated by heating within the range 875 to 1150 F (468 to 621 C), holding at the selected temperature within 15 F (8 C) for 2 to 30 hours. Precipitation heat treatment shall precede final machining of specimens. 3.5.2.1 Tensile Properties Shall be as shown in Table 4, determined in accordance wit
37、h 3.5.1.1. SAE INTERNATIONAL AMS4939 C Page 6 of 8 Table 4 Table 4A - Minimum tensile properties, inch/pound units (see 8.3) Nominal Thickness Inches Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 2 Inches or 4D % Up to 0.1874, incl 180 170 6 Over 0.1874 to 1.999, incl 180 170
38、8 Over 1.999 to 4.000, incl 170 160 6 (4) (3.5.2.1.1) Table 4B - Minimum tensile properties, SI units (see 8.3) Nominal Thickness Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 50.8 mm or 4D % Up to 4.76, incl 1241 1172 6 Over 4.76 to 50.77, incl 1241 1172 8 Over 50
39、.77 to 101.60, incl 1172 1103 6 (4) (3.5.2.1.1) 3.5.2.1.1 Elongation value in parentheses applies in the transverse direction only. 3.5.3 Mechanical property requirements for product outside the size range covered by 1.1 shall be agreed upon between purchaser and producer. 3.6 Quality The product, a
40、s received by purchaser, shall be uniform in quality and condition, sound, and free from “oil cans” (see 8.4.1) of depth in excess of the flatness tolerances, ripples, and foreign materials and from imperfections detrimental to usage of the product. 3.6.1 When specified, plate 0.500 inches (12.70 mm
41、) and over in nominal thickness shall be ultrasonically inspected in accordance with AMS2631 and shall meet the quality standards agreed upon between the purchaser and supplier (see 8.6). 3.7 Tolerances Shall conform to all applicable requirements of AMS2242. 3.8 Production, distribution, and procur
42、ement 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 producers tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to
43、perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests All technical requirements are acceptance tests and shall be performed on each heat or lot as applicable. SAE INTERNATIONAL AMS4939 C Page 7 of 8 4.3 Sampling
44、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 in the same heat treatment batch. 4.3.1 Composition One sample from each heat, except that for hydrogen determinations one sample f
45、rom each lot obtained after thermal and chemical processing is completed. 4.3.2 Tensile Properties, Bending, Microstructure, Surface Contamination and Tensile Properties after Precipitation Hardening At least one sample from each lot. 4.3.2.1 Specimens for tensile tests of widths 9 inches (229 mm) a
46、nd over shall be taken in both the longitudinal and transverse directions; for widths under 9 inches (229 mm), specimens shall be taken in the longitudinal direction. 4.3.2.2 Bend Specimens Whenever possible, the specimen shall be long enough to permit two separate bends so that each surface is test
47、ed in tension. Alternately two specimens from adjacent locations may be used. 4.3.2.3 Ultrasonic Quality When specified, each plate required by 3.6.1 (see 8.6). 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report showing producer identity, country where the metal was melted (i.e
48、., 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, tensile and bending properties, and surface contamination of each lot, ultrasonic quality of each plate when required, and state that the prod
49、uct conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS4939C, product form, size, specific aging treatment used to develop precipitation hardened properties, and quantity. 4.4.2 When the product size is outside the range covered by 1.1, the report shall contain a statement to that effect. 4.5 Resampling and Retesting Sh
