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/AMS4976K AEROSPACE MATERIAL SPECIFICATION AMS4976 REV. K Issued 1968-05 Revised 2017-07 Superse
5、ding AMS4976J Titanium Alloy, Forgings 6.0Al - 2.0Sn - 4.0Zr - 2.0Mo - 08Si Solution and Precipitation Heat Treated (Composition similar to UNS R54620) RATIONALE AMS4976K results from a Five-Year Review and update of this specification that includes the addition of ASTM E2994 (3.1), removal of sampl
6、e 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 forgings 3.000 inches (76.20 mm) and under in nominal diameter or least distance between parallel sides and 9 in2(58 cm2) and under in cross-sectional area an
7、d forging stock of any size (see 8.5). 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 procedures and service conditions may
8、 cause these forgings 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. T
9、he 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 AMS4976K Page 2 of 7 2.1
10、 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. AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS2750 Pyrometry AMS2808 Identificatio
11、n, Forgings ARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS1814 Terminology for Titanium Microstructures AS6279 Industry Standard Practices for Production, Distribution, and Procurement of Metal
12、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 E8/E8M Tension Testing of Metallic Materials ASTM E21 Elevated Temperature Tension Tests of Metallic Materials ASTM E139 Conduc
13、ting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials ASTM E292 Conducting Time-for-Rupture Notch Tension Tests of 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 Ti
14、tanium 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 Alloys by Direct Current Plasma and Inductively Coupled Plasm
15、a Atomic 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 weight shown in Table 1; carbon shall be determined in accorda
16、nce 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 purchaser. SAE INTERNATIONAL AMS4976K Page 3 of 7 Table 1 - Compos
17、ition 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) 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 0.00
18、5 0.10 0.30 (500 ppm) (125 ppm) ( 50 ppm) 3.1.1 Hydrogen content of forgings may be as high as 0.0150 (150 ppm). 3.1.2 Determination not required for routine acceptance. 3.1.3 Check Analysis Composition variations shall meet the applicable requirements of AMS2249; no variation over maximum will be p
19、ermitted for yttrium. 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 subsequent melt or melts shall be made using vacuum arc remeltin
20、g (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. 3.2.2 The electrode tip for nonconsumable electrode melting
21、shall be water-cooled copper. 3.3 Condition The product shall be supplied in the following condition: 3.3.1 Forgings Solution and precipitation heat treated, and descaled. 3.3.2 Forging Stock As ordered by the forging manufacturer. 3.4 Heat Treatment Forgings shall be solution heat treated by heatin
22、g 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 an air cool or faster and precipitation heat treated by heating to 1100 F 15 (593 C
23、8), holding at heat for 8 hours 0.25 hour, and cooling in air. Pyrometry shall be in accordance with AMS2750. SAE INTERNATIONAL AMS4976K Page 4 of 7 3.5 Properties The product shall conform to the following requirements: 3.5.1 Forgings Forgings 3.000 inches (76.20 mm) and under in nominal diameter o
24、r least distance between parallel sides and 9 in2(58 cm2) and under in cross-sectional area shall conform to the following requirements: 3.5.1.1 Tensile Properties Shall be as follows, determined on specimens having a gage diameter not less than 0.250 inch (6.35 mm). 3.5.1.1.1 At Room Temperature Sh
25、all be as specified 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. Table 2 - Minimum room temperatu
26、re tensile properties Property Value Tensile Strength Yield Strength at 0.2% Offset Elongation in 4D Reduction of Area 130 ksi (896 MPa) 120 ksi (827 MPa) 10% 25% 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 (482
27、C 6), held at heat for 20 to 30 minutes before testing, and tested at 900 F 10 F (482 C 6) using strain rates as specified in 3.5.1.1.1: Table 3 - Minimum elevated temperature tensile properties Property Value Tensile Strength Yield Strength at 0.2% Offset Elongation in 4D Reduction of Area 90 ksi (
28、621 MPa) 70 ksi (483 MPa) 15% 30% 3.5.1.1.3 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 C) An unnotched tensile specimen, maintained at 950 F 3 (510 C 2) while an axial
29、stress of 35.0 ksi (241 MPa) is applied continuously, shall not exceed 0.1% plastic strain in 35 hours. Gage dimensions of specimens and techniques used to measure creep shall be as agreed upon by purchaser and producer. Test shall be conducted in accordance with ASTM E139. 3.5.1.3 Microstructure Sh
30、all 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 Equiaxed and/or elongated primary alpha in a transformed beta matrix with no continuous network of alpha at prior beta grain boundaries. SAE INTERNATIO
31、NAL AMS4976K Page 5 of 7 3.5.1.3.2 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. 3.5.1.4 Surface Contamination Except as specified in 3.5.1.4.1, forgings shall be free of any ox
32、ygen-rich layer (see 8.2), such as alpha case, or other surface contamination, determined by microscopic examination at not lower than 400X magnification or other method acceptable to purchaser. 3.5.1.4.1 When permitted by purchaser, forgings to be machined all over may have an oxygen-rich layer pro
33、vided 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 and heat treated as in 3.4, specimens taken from the heat-treated coupon shall conform to the requirements of 3.5.1.1 and 3.5.1.2. If specimens taken fro
34、m the stock after heat treatment as in 3.4 conform to the requirements of 3.5.1.1 and 3.5.1.2, 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 a
35、nd from imperfections detrimental to usage of the product. 3.7 Production, distribution, and procurement of metal stock shall comply with AS6279. This requirement becomes effective October 1, 2015. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall su
36、pply 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 confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Ac
37、ceptance 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. 4.2.1.2 Hydrogen content (3.1), tensile properties (3.5.1.1.1 and 3.5.1.1.2), creep properties (3.5.1.2), microstructure (3.5.1.3), and sur
38、face contamination (3.5.1.4) of each lot of forgings. 4.2.2 Periodic Tests Ability of forging stock (3.5.2) to develop required properties is a periodic test and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser: SAE INTERNATIONAL AMS497
39、6K Page 6 of 7 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 and solution and precipitation heat treated in the same heat treat batch. 4.3.1 For Acceptance Tests 4.3.1.1 Compositio
40、n One sample from each heat, except that for hydrogen determinations one sample from each lot obtained after thermal and chemical processing has been completed. 4.3.1.2 Tensile Properties One specimen from a forging from each lot taken from a section having maximum thickness and a specimen from a se
41、ction having minimum thickness which will provide a standard specimen with gage diameter not less than 0.250 inch (6.35 mm). 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., final melt in the case of metal p
42、rocessed by multiple melting operations), the results of tests for composition of each heat and for the hydrogen content, tensile properties, and creep properties of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order numb
43、er, heat and lot numbers, AMS4976K, specific heat treatment used, quantity, and size or part number (if applicable) and the melt source and size of stock used to make the forgings. 4.4.2 Report the nominal metallurgically worked cross sectional size and the cut size, if different. 4.4.3 When the pro
44、duct size is outside the size range covered by 1.1, the report shall contain a statement to that effect. 4.4.4 The producer of forging stock shall furnish with each shipment a report showing producer identity, country where the metal was melted (i.e., final melt in the case of metal processed by mul
45、tiple melting operations) and the results of tests for composition of each heat and for the hydrogen content of each lot. The report shall include the purchase order number, heat number, AMS4976K, size, and quantity. 4.5 Resampling and Retesting If any specimen used in the above tests fails to meet
46、the specified 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
47、 tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Identification 5.1.1 Forgings In accordance with AMS2808. 5.1.2 Forging Stock As agreed upon by purchaser and producer. SAE INTERNATIONAL AMS4976K Page 7 of 7 5.2 Packaging The product shall be prepared for shipment in accordance with commerc
48、ial 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. 6. ACKNOWLEDGMENT A producer shall include this specification number and its revision letter in all quotations
49、 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 where technical revisions, not editorial changes, have been made to the previous issu
