SAE AMS 4975N-2017 Titanium Alloy Bars Wire and Rings 6 0Al - 2 0Sn - 4 0Zr - 2 0Mo - 0 08Si Solution and Precipitation Heat Treated (UNS R54620).pdf

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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/AMS4975N AEROSPACE MATERIAL SPECIFICATION AMS4975 REV. N Issued 1960-05 Revised 2017-07 Superse

5、ding AMS4975M Titanium Alloy, Bars, Wire, and Rings 6.0Al - 2.0Sn - 4.0Zr - 2.0Mo - 0.08Si Solution and Precipitation Heat Treated (Composition similar to UNS R54620) RATIONALE AMS4975N results from a Five-Year Review and update of this specification that adds ASTM E2994 (3.1) and removal of sample

6、size allowance for hydrogen of Table 1 (covered by ASTM E1447). 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of bars, wire, flash welded rings 3.00 inches (76.2 mm) and under in nominal diameter or least distance between parallel sides and 16 in2(103 cm2) and under in cro

7、ss-sectional area and stock of any size for flash welded rings (see 8.4). 1.2 Application These products have been used typically for parts requiring high strength and toughness and good creep resistance up to 1000 F (538 C), but usage is not limited to such applications. 1.2.1 Certain processing pr

8、ocedures 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 of the purchase order forms a part of this specificatio

9、n 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 last published issue of that document shall apply. SAE INT

10、ERNATIONAL AMS4975N 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 +1 724-776-4970 (outside USA), www.sae.org. AMS2241 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titan

11、ium, and Titanium Alloy Bars and Wire AMS2249 Chemical Check Analysis Limits Titanium and Titanium Alloys AMS2750 Pyrometry AMS2809 Identification Titanium and Titanium Alloy Wrought Products AMS7498 Rings, Flash Welded Titanium and Titanium Alloys ARP982 Minimizing Stress-Corrosion Cracking in Wrou

12、ght Titanium Alloy Products ARP1917 Clarification of Terms Used in Aerospace Metals Specifications 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, West Conshohocken, P

13、A 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM E8/E8M Tension Testing of Metallic Materials ASTM E21 Elevated Temperature Tension Tests of Metallic Materials ASTM E139 Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials ASTM E1409 Determination of Oxygen and Nitrogen

14、 in Titanium and Titanium Alloys by Inert Gas Fusion 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

15、s ASTM E2371 Analysis of Titanium and Titanium Alloys by 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 SAE INTERNATIONAL AMS49

16、75N Page 3 of 8 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 and nitrogen in accordance with ASTM E1409, and other elements in accordance

17、 with ASTM E2371 or ASTM E2994. Other analytical methods may be used if acceptable to the purchaser. Table 1 - Composition Element Min Max Aluminum Zirconium Molybdenum Tin Silicon Oxygen Iron Carbon Nitrogen Hydrogen (3.1.1) Yttrium (3.1.2) Other Elements, each (3.1.2) Other Elements, total (3.1.2)

18、 Titanium 5.50 3.60 1.80 1.80 0.06 - - - - - - - - remainder 6.50 4.40 2.20 2.20 0.10 0.15 0.10 0.05 0.05 0.0125 0.005 0.10 0.30 (500 ppm) (125 ppm) ( 50 ppm) 3.1.1 Hydrogen content of rings may be as high as 0.0150 (150 ppm). 3.1.2 Determination not required for routine acceptance. 3.1.3 Check Anal

19、ysis 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 subsequ

20、ent melt or melts shall be made using vacuum arc remelting (VAR) practice. Alloy additions are not permitted in the final VAR melt. 3.2.1 The atmosphere for nonconsumable 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

21、.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, solution and precipitation heat treated, and descaled. The product shall b

22、e 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. SAE INTERNATIONAL AMS4975N Page 4 of 8 3.3.2 Wire Cold drawn, solution and precipitation heat treated, and

23、 descaled. 3.3.3 Flash Welded Rings Solution and precipitation heat treated and, when so specified, descaled. 3.3.3.1 Flash welded rings, when supplied, shall be manufactured in accordance with AMS7498. 3.3.4 Stock for Flash Welded Rings As ordered by the flash welded ring manufacturer. 3.4 Heat Tre

24、atment Bars, wire, and flash welded rings shall be solution heat treated by heating to a temperature 25 to 50 F (14 to 28 C) below the beta transus, determined on each heat of alloy, holding at the selected temperature within 15 F (8 C) for 60 minutes 5 minutes, and cooling at a rate equivalent to a

25、n air cool or faster and precipitation heat treated by heating to 1100 F 15 F (593 C 8 C), holding at heat for 8 hours 0.25 hour, and cooling in air. Pyrometry shall be in accordance with AMS2750. 3.5 Properties The product shall conform to the following requirements: 3.5.1 Bars, Wire, and Flash Wel

26、ded Rings Product 3.000 inches (76.20 mm) and under in nominal diameter or least distance between parallel sides and 16 in2(103 cm2) and under in cross-sectional area shall conform to the following requirements: 3.5.1.1 Tensile Properties Shall be as follows, determined in either the longitudinal or

27、 transverse direction except that testing in the transverse direction applies only to product from which a tensile specimen not less than 2.50 inches (63.5 mm) in length can be obtained. 3.5.1.1.1 At Room Temperature Shall be as specified in Table 2, determined in accordance with ASTM E8/E8M with th

28、e 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 - Minimum tensile properties Property Value Tensile Strength Yield Strength at 0.2% Offset Elongation in

29、4D Reduction of Area 130 ksi (896 MPa) 120 ksi (827 MPa) 10% 25% SAE INTERNATIONAL AMS4975N Page 5 of 8 3.5.1.1.2 At 900 F (482 C) Shall be as specified in Table 3, determined in accordance with ASTM E21 on specimens heated to 900 F 10 F (482 C 6 C), held at heat for 20 to 30 minutes before testing,

30、 and tested at 900 F 10 F (482 C 6 C) using strain rates as specified in 3.5.1.1.1. Table 3 - Minimum tensile properties Property Value Tensile Strength Yield Strength at 0.2% Offset Elongation in 4D Reduction of Area 90 ksi (621 MPa) 70 ksi (483 MPa) 15% 35% 3.5.1.1.3 Yield strength and reduction o

31、f area requirements of 3.5.1.1.1 and 3.5.1.1.2 do not apply to wire under 0.125 inch (3.18 mm) in nominal diameter. 3.5.1.1.4 Mechanical property requirements for product outside the size range covered by 1.1 shall be agreed upon between purchaser and producer. 3.5.1.2 Creep Properties at 950 F (510

32、 C) An unnotched tensile specimen, maintained at 950 F 3 F (510 C 2 C) while an axial stress of 35.0 ksi (241 MPa) is applied continuously, shall not exceed 0.1% plastic strain in less than 35 hours. Test shall be conducted in accordance with ASTM E139. 3.5.1.3 Microstructure Shall be that structure

33、 resulting from processing within the alpha-beta phase field. Microstructure shall conform to 3.5.1.3.1. 3.5.1.3.1 Equiaxed and/or elongated primary alpha in a transformed beta matrix with no continuous network of alpha at prior beta grain boundaries. 3.5.1.4 Surface Contamination The product, excep

34、t as specified in 3.5.1.4.1, shall be free of 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 When permitted by purchaser, flash welded rings to

35、 be machined all over may have an oxygen-rich layer provided such layer is removable within the machining allowance for the part. 3.5.2 Stock for Flash Welded Rings When a sample of stock is heat treated as in 3.4, specimens taken from the sample coupons shall conform to the requirements of 3.5.1.1

36、and 3.5.1.2. 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. 3.7 Tolerances Bars and wire shall conform to all applicable requirements of AMS2241. SAE INTE

37、RNATIONAL AMS4975N Page 6 of 8 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 supply all samples for producers tests and shall be responsible for the performanc

38、e 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 Acceptance Tests The following requirements are acceptance tests and shall be perf

39、ormed 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 Room-temperature tensile properties (3.5.1.1.1), creep properties (3.5.1.2), microstructure (3.5.1.3), and surface contamination (3.5.1.4) of each lot of bars, wire, and rings. 4

40、.2.1.3 Tolerances (3.7) of bars and wire. 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 Tensile properties at 900 F (482 C) (3.5.1.1.2) of bars, wire, an

41、d rings. 4.2.2.2 Ability of stock for flash welded rings to develop required properties (3.5.2). 4.3 Sampling 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: 4.3.1 For Acceptance Tests 4.3.1.1 C

42、omposition One sample from each heat; 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 samples from bars, wire, and flash welded rings from each lot. 4.3.1.2.1 Specimens from flash welded ri

43、ngs shall be cut from parent metal not including the weld-heat-affected zone. 4.3.1.3 Other Requirements One sample from each lot. SAE INTERNATIONAL AMS4975N Page 7 of 8 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report showing producer identity, country where the metal was me

44、lted (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, and creep properties of each lot, and, when performed, to the periodic test requirements and state that the b

45、ars, wire, and flash welded rings conform to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS4975N, product form and mill produced size (and/or part number, if applicable), specific heat treatment used, and quantity. The producer of sto

46、ck for flash welded rings shall furnish with each shipment a report showing the results of tests for chemical composition of each heat and for the hydrogen content of each lot. The report shall include the purchase order number, heat number, AMS4975N, size, and quantity. 4.4.2 Report the nominal met

47、allurgically worked cross sectional size and the cut size, if different (see 3.3.1). 4.4.3 When the product size is outside the size range covered by 1.1, the report shall contain a statement to that effect. 4.5 Resampling and Retesting If any specimen used in the above tests fails to meet the speci

48、fied requirements, disposition of the product may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the product represented. Results of all tests sh

49、all be reported. 5. PREPARATION FOR DELIVERY 5.1 Identification 5.1.1 Bars and Wire In accordance with AMS2809 as applicable. 5.1.2 Flash Welded Rings and Stock for Flash Welded Rings As agreed upon by purchaser and producer. 5.2 Packaging The product shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations per