1、AEROSPACE MATERIAL SPECIFICATION AMS4950 REV. D Issued 1996-08 Revised 2015-01 Superseding AMS4950C Titanium Alloy, Bars, Wire, Forgings, and Rings 6.0Al - 4.0V Solution Heat Treated and Aged Modified Strength (Composition similar to UNS R56400) RATIONALE AMS4950D results from a Five Year Review and
2、 update of this specification that includes the removal of sample size allowance for hydrogen of Table 1 (covered by ASTM E1447), removal of the higher allowance of hydrogen for forgings, requires agreement on mechanical property values for material outside specification ranges (3.5.1.1.4 and 8.6),
3、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, wire, forgings, and flash welded rings 4.000 inches (101.60 mm) and under in nominal diameter or least distance between parallel sides and of stock f
4、or forging or flash welded rings of any size (See 8.6). 1.2 Application These products have been used typically for parts which are machined after being solution heat treated and aged, and are suitable for parts requiring high strength-to-weight ratios at or near room temperature, but usage is not l
5、imited 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 conditions. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date
6、 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 referenced document has been cancelled and no superseding document has been specified, the la
7、st published issue of that document shall apply. _ 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
8、, including any patent infringement arising therefrom, 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 Int
9、ernational All rights reserved. No part of this publication 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
10、-7323 (inside USA and Canada) Tel: +1 724-776-4970 (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/AMS4950D SAE INTERNATIONAL AMS49
11、50D Page 2 of 8 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA, www.sae.org. AMS2241 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titanium, and Titanium Al
12、loy Bars and Wire AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys 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
13、Cracking in Wrought Titanium Alloy Products AS6279 Industry Standard Practices for 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
14、. ASTM E3 Preparation of Metallographic Specimens ASTM E8 / E8M Tension Testing of Metallic Materials ASTM E399 Plane-Strain Fracture Toughness of Metallic Materials ASTM E539 Analysis of Titanium Alloys by X-Ray Fluorescence Spectrometry ASTM E1409 Determination of Oxygen and Nitrogen in Titanium a
15、nd 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 Reactive Metals and Their Alloys by Combustion Analysi
16、s 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 shall be determined in accordance with ASTM E1941,
17、hydrogen in accordance with ASTM E1447, oxygen and nitrogen in accordance with ASTM E1409, and other elements in accordance with ASTM E539 or ASTM E2371. Other analytical methods may be used if acceptable to the purchaser. SAE INTERNATIONAL AMS4950D Page 3 of 8 Table 1 - Composition Element min max
18、Aluminum 5.50 6.75 Vanadium 3.50 4.50 Iron - 0.30 Oxygen - 0.20 Carbon - 0.08 Nitrogen - 0.05 (500 ppm) Hydrogen - 0.0125 (125 ppm) Yttrium (3.1.2) - 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 routi
19、ne acceptance. 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2249; no variation over maximum shall be permitted for yttrium. 3.2 Melting Practice Alloy shall be multiple melted. The first melt shall be made by vacuum consumable electrode, nonconsumable elec
20、trode, 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 melt cycle. 3.2.1 The atmosphere for nonconsumable electrode melting shall b
21、e 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. 3.3 Condition The product shall be supplied in the following condition: 3.3.1 Bars Hot finished with or witho
22、ut subsequent cold reduction, solution heat treated, aged, and descaled. 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 cut from plate. 3.3.2 Wire Cold dr
23、awn, solution heat treated, aged, and descaled. 3.3.3 Forgings and Flash Welded Rings Solution heat treated, aged, and descaled. 3.3.3.1 Flash welded rings shall not be supplied unless specified or permitted on purchasers part drawing. When supplied, rings shall be manufactured in accordance with AM
24、S7498. 3.3.4 Stock for Forging or Flash Welded Rings As ordered by the forging or flash welded ring manufacturer. SAE INTERNATIONAL AMS4950D Page 4 of 8 3.4 Heat Treatment Bars, wire, forgings, and flash welded rings shall be solution heat treated by heating in a suitable atmosphere to 1750 F 25 (95
25、4 C 14), holding at heat for 1 to 2 hours, and quenching in agitated water, and aged by heating to a temperature within the range 900 to 1150 F (482 to 621 C), holding at the selected temperature within 15 F (8 C) for 4 to 8 hours, and cooling in air. Pyrometry shall be in accordance with AMS2750. 3
26、.5 Properties The product shall conform to the following requirements: 3.5.1 Bars, Wire, Forgings, and Flash Welded Rings 3.5.1.1 Tensile Properties Shall be as shown in Table 2 for round, square, and hexagonal bars, forgings, and flash welded rings, determined in accordance with ASTM E8 / E8M with
27、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 both the longitudinal and transverse directions, but tests in
28、the transverse direction are not required on product tested in the longitudinal direction. Transverse tensile properties of Table 2 apply only to product from which a test specimen not less than 2.50 inches (63.5 mm) in length can be obtained. 3.5.1.1.2 Tensile properties for rectangles shall be as
29、agreed upon by purchaser and producer. 3.5.1.1.3 Yield strength and reduction of area requirements do not apply to wire under 0.125 inch (3.18 mm) in nominal diameter. Table 2A - Minimum tensile properties, inch/pound units Nominal Diameter or Least Distance Between Parallel Sides Inches Tensile Str
30、ength ksi Yield Strength at 0.2% Offset ksi Elongation1in 2 Inches or 4D % L Elongation1in 2 Inches or 4D % T Reduction of Area % L Up to 0.500, incl 165 155 10 - 20 Over 0.500 to 0.625, incl 158 144 10 - 20 Over 0.625 to 1.000, incl 150 137 10 - 20 Over 1.000 to 1.500, incl 145 129 10 - 20 Over 1.5
31、00 to 2.000, incl 140 129 10 - 20 Over 2.000 to 3.000, incl 135 125 10 8 20 Over 3.000 to 4.000, incl 130 120 10 6 20 1Minimum elongation shall be 8%, longitudinal, and 6%, transverse, for all size forgings. SAE INTERNATIONAL AMS4950D Page 5 of 8 Table 2B - Minimum tensile properties, SL units Nomin
32、al Diameter or Least Distance Between Parallel Sides Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset Mpa Elongation1in 50.8 mm or 4D % L Elongation1in 50.8 mm or 4D % T Reduction of Area % L Up to 12.70, incl 1138 1069 10 - 20 Over 12.70 to 15.88, incl 1089 993 10 - 20 Over 15.88 to 2
33、5.40, incl 1034 945 10 - 20 Over 25.40 to 38.10, incl 1000 889 10 - 20 Over 38.10 to 50.80, incl 965 889 10 - 20 Over 50.80 to 76.20, incl 931 862 10 8 20 Over 76.20 to 101.60, incl 896 827 10 6 20 1Minimum elongation shall be 8%, longitudinal, and 6%, transverse, for all size forgings. 3.5.1.1.4 Me
34、chanical property requirements for product outside the size range covered by Table 2 shall be agreed upon between purchaser and producer. 3.5.1.2 Fracture Toughness Properties When specified (See 8.6), the product shall be subjected to fracture toughness testing. Method of test, specimen orientation
35、 and standards for acceptance shall be as agreed upon by purchaser and producer. Recommended method of test is ASTM E399. 3.5.1.3 Microstructure Shall be that structure resulting from processing within the alpha-beta phase field. Microstructure shall conform to 3.5.1.3.1 or 3.5.1.3.2. 3.5.1.3.1 Equi
36、axed and/or elongated primary alpha in a transformed beta matrix with no continuous network of alpha at prior beta grain boundaries. 3.5.1.3.2 Primary alpha in an aged transformed beta matrix. 3.5.1.4 Surface Contamination Except as specified in 3.5.1.4.1 and 3.5.1.4.2, the product shall be free of
37、any oxygen-rich layer, such as alpha case, or other surface contamination, determined by microscopic examination at not lower than 400X magnification or by other method acceptable to purchaser. 3.5.1.4.1 An oxygen-rich layer (See 8.2) not greater than 0.001 inch (0.025 mm) in depth will be permitted
38、 on bars other than rounds. 3.5.1.4.2 When 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 on the forging or flash welded ring. 3.5.2 Forging Stock When a sample of stock is
39、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, 3.5.1.2 when specified, 3.5.1.3, and 3.5.1.4. If specimens taken from the stock after heat treatment as in 3.4 conform to the requirements of 3.5.1.1, 3.5.1.
40、2 when specified, 3.5.1.3, and 3.5.1.4, the tests shall be accepted as equivalent to tests of a forged coupon. 3.5.3 Stock for Flash Welded Rings Specimens taken from the stock after heat treatment as in 3.3 shall conform to the requirements of 3.5.1.1, 3.5.1.2 when specified, 3.5.1.3, and 3.5.1.4.
41、SAE INTERNATIONAL AMS4950D Page 6 of 8 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 which contain flas
42、h-line 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 requiremen
43、t becomes effective June 01, 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 specified tests. Purchaser reserves the right to sample and to perform any
44、 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. 4.2.1.1 Composition (3.1) of each heat. 4
45、.2.1.2 Hydrogen content (3.1), tensile properties (3.5.1.1), fracture toughness (3.5.1.2) when specified, microstructure (3.5.1.3), and surface contamination (3.5.1.4) of each lot of bars, wire, forgings, and flash welded rings. 4.2.1.3 Tolerances (3.7) of each lot of bars and wire. 4.2.2 Periodic T
46、ests Ability of forging stock (3.5.2) and stock for flash welded rings (3.5.3) to develop required properties, and grain flow of die forgings (3.6.1) 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
47、and Testing Shall be in accordance with 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 treated and aged in the same heat treat batch. 4.3.1 For Acceptance Tests 4.3.1.1 Composition One sample from each heat, except t
48、hat for hydrogen determination one sample from each lot obtained after thermal and chemical processing has been completed. 4.3.1.2 Tensile Properties One or more sample(s) from bars, wire, and flash welded rings from each lot. One longitudinal specimen from a forging from each lot from a section hav
49、ing maximum thickness and from a section having minimum thickness. SAE INTERNATIONAL AMS4950D Page 7 of 8 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 Other Requirements One or more specimens from each lot for microstructure and surface contamination shall be prepared in accordance with ASTM E3. Machined or centerless ground bar
