1、_ 6$(7HFKQLFDO6WDQGDUGV%RDUG5XOHVSURYLGHWKDW7KLVUHSRUWLVSX EOLVKHGE6$(WRDGYDQFHWKHVWDWHRIWHFKQLFDODQGHQJL neering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any partLFXODUXVHLQFOXGLQJDQSDWHQWLQIULQJHPHQWDULVLQJWKHUHIURPLVWKHVROH UHVSRQVLELOLWRIW
2、KHXVHU 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 2016 SAE International All rights reserved. No part of this publication may be reproduced, stored in
3、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: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email:
4、 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/AMS4921N AEROSPACE MATERIAL SPECIFICATION AMS4921 REV. N Issued 1952-11 Revised 2016-07 Superseding AMS4921M Titanium Bar
5、s, Wire, Forgings, and Rings Commercially Pure 70 ksi (483 MPa) Yield Strength (Composition similar to UNS R50700) RATIONALE AMS4921N results from a Five Year Review and update of this specification that removes of sample size allowance for hydrogen (covered by ASTM E1447), requires agreement on mec
6、hanical property values for material outside specification ranges (3.5.1.1.5), the addition of AS6279 (3.8), added AMS2368 to sampling (4.3) and revises reporting (4.4). 1. SCOPE 1.1 Form This specification covers one grade of commercially-pure titanium in the form of bars, wire, forgings, flash wel
7、ded rings, up to 4.000 inches (101.60 mm), inclusive, in nominal diameter or least distance between parallel sides, and stock for forging or flash welded rings. 1.2 Application These products have been used typically for parts requiring high corrosion resistance and moderate strength up to 400 F (20
8、4 C), and oxidation resistance up to 600 F (316 C), but usage is not limited to such applications. 1.3 Classification 1.3.1 Melting Practice Product covered by this specification is classified by melting practice as follows: Type 1 - Multiple melted with at least one of the melting cycles under vacu
9、um. Type 2 - Electron beam cold hearth or plasma arc cold heath melted. 1.3.1.1 Unless a specific type is ordered, either type may be supplied. SAE INTERNATIONAL AMS4921N Page 2 of 8 1.3.2 Ultrasonic Inspection Product covered by this specification is classified by test requirements as follows: Clas
10、s 1 - Ultrasonic inspection is not required. Class 2 - Product shall be ultrasonically inspected (see 3.6.2). 1.3.2.1 Class 1 may be provided unless Class 2 is specified. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this spe
11、cification 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
12、. 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, Titanium, and Titanium Alloy Bars a
13、nd Wire AMS2249 Chemical Check Analysis 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 AMS2808 Identification Forging
14、s AMS2809 Identification Titanium and Titanium Alloy Wrought Products AMS7498 Rings, Flash Welded Titanium and Titanium Alloys ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS6279 Standard Practice for Production, Distribution, and Procurement of Metal Stock 2.2 ASTM Publica
15、tions 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 Inert Gas Fusion AST
16、M 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 Alloys by
17、 Direct Current Plasma and Inductively Coupled Plasma Atomic Emission Spectrometry SAE INTERNATIONAL AMS4921N 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 accor
18、dance with ASTM E1447, oxygen 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. Table 1 - Composition Element min max Iron - 0.50 Oxygen - 0.40 Carbon - 0.08 Nitrogen - 0.05 (500 ppm) Hyd
19、rogen - 0.0125 (125 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 Analysis Composition variations shall meet the applicable requirements of AMS2249. 3.2 Melting Practice 3.2.1 Type
20、 1 Alloy shall be multiple melted. Melting cycle(s) prior to the final melting cycle shall be made using vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice(s). The final melting cycle shall be made under vacuum using vacuum arc
21、 remelting (VAR) practice with no alloy additions. 3.2.1.1 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. 3.2.1.2 The electrode tip for nonconsumable electrode melting shall be water-coole
22、d copper. 3.2.2 Type 2 Alloy shall be single cold hearth melted. Either electron beam cold hearth or plasma arc cold hearth melting may be used. 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 de
23、scaled. A machined or ground surface is permitted unless prohibited by purchaser. The product shall be produced using standard industry practices for the production of bar to the procured thickness/diameter. Cut plate shall not be substituted for bar. 3.3.2 Wire Cold drawn, annealed, and descaled. S
24、AE INTERNATIONAL AMS4921N Page 4 of 8 3.3.3 Forgings and Flash Welded Rings Annealed and descaled. 3.3.4 Flash welded rings shall not be supplied unless specified or permitted on purchasers part drawing. When supplied, the rings shall be manufactured in accordance with AMS7498. 3.3.5 Stock for Forgi
25、ng or Flash Welded Rings As ordered by the forging or flash welded ring manufacturer. 3.4 Annealing Bars 3.4.1 Annealing Bars, wire, forgings, and flash welded rings shall be annealed by heating to a temperature within the range 1200 to 1475 F (649 to 802 C), holding at the selected temperature with
26、in 25 F (14 C) for not less than 1 hour, and cooling at a rate which 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 Bars, Wire, Forgings, and Flash Welded Rings 3.5.1.1
27、 Tensile Properties Shall be as shown in Table 2 for product up to 4.000 inches (101.60 mm), inclusive, in nominal diameter or least distance between parallel sides, 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 wi
28、thin 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 (see 8.2) Property Value Tensile Strength 80 ksi (552 MPa) Yield Strength at 0.2% Offset 70 ksi (483 MPa) Elongation in 4D Longitudinal 15% Long-Transverse 12% S
29、hort-Transverse 10% Reduction of Area Longitudinal 30% Long-Transverse 25% Short-Transverse - 3.5.1.1.1 Tensile and yield strength requirements apply to both longitudinal and transverse directions. 3.5.1.1.2 Specimens for the longitudinal requirements of Table 2 shall be taken with the axis of the s
30、pecimen within 15 degrees of parallel to the grain flow and to specimens taken in the radial direction and in the tangential direction at the rim of disc-type forgings. 3.5.1.1.3 Transverse tensile properties apply only to product that a test specimen not less than 2.50 inches (63.5 mm) in length ca
31、n be taken but are not required for round, square, and hexagonal bar over 3 inches (76.2 mm). Transverse specimens shall be only in the short transverse direction for rectangles and forgings when the short transverse dimension is over 3.000 inches (76.2 mm). 3.5.1.1.4 Yield strength and reduction of
32、 area requirements do not apply to wire under 0.125 inch (3.18 mm) in diameter. SAE INTERNATIONAL AMS4921N Page 5 of 8 3.5.1.1.5 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 Surface Contamination Excep
33、t as specified in 3.5.1.2.1 and 3.5.1.2.2, the product shall be free of any oxygen-rich layer such as alpha case, or other surface contamination, determined by microscopic examination at not lower than 400 X magnifications or by other method acceptable to purchaser. 3.5.1.2.1 An oxygen-rich layer (s
34、ee 8.3) not greater than 0.001 inch (0.025 mm) in depth will be permitted on bars other than rounds. 3.5.1.2.2 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 for
35、ging or flash welded ring. 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 heat treatment as in 3.4 conform to the requ
36、irements of 3.5.1.1, 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 3.4 shall conform to the requirements of 3.5.1.1. 3.6 Quality The product, as received by purchaser, shall be unifo
37、rm 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 flash-line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grai
38、n flow. 3.6.2 Ultrasonic Inspection When Class 2 material is specified, bar, rod, or forging stock 0.500 to 1.500 inches (12.70 to 38.10 mm) inclusive in nominal thickness, diameter or least distance between parallel sides shall be ultrasonically inspected in accordance with AMS2631 and shall meet C
39、lass A1 requirements of AMS2631. When Class 2 material is specified, bar, rod, or forging stock over 1.500 inch (38.10 mm) in nominal thickness, diameter or least distance between parallel sides shall be ultrasonically inspected in accordance with AMS2631 and shall meet Class A requirements of AMS26
40、31. 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 requirement becomes effective January 1, 2018. SAE INTERNATIONAL AMS4921N Page 6 of 8 4. QUALITY ASSURANCE PROVISIONS
41、4.1 Responsibility for Inspection The producer of the product shall supply all samples for producers test 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 con
42、forms 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. 4.2.1.2 Hydrogen content (3.1), tensile properties (3.5.1.1), and surf
43、ace contamination (3.5.1.2) of each lot of bars, wire, forgings, and flash welded rings. 4.2.1.3 Ultrasonic quality of each piece as required for Class 2 product (3.6.2). 4.2.1.4 Tolerances (3.7) of bars and wire. 4.2.2 Periodic Tests Tests to determine ability of forging stock (3.5.2) and stock for
44、 flash welded rings (3.5.3) to develop required properties and for 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 and Testing Shall be in accordance AMS2368 and t
45、he following; a lot shall be all product of the same nominal size from the same heat processed at the same time and annealed as a heat treat batch. 4.3.1 For Acceptance Tests 4.3.1.1 Composition One sample from each heat, except that for hydrogen determinations one sample from each lot obtained afte
46、r thermal and chemical processing is completed. 4.3.1.2 Tensile Properties At least one sample from bars, wire, and flash welded rings from each lot. One longitudinal sample and, where applicable, one transverse sample shall be taken from a section having maximum thickness from each lot of forgings.
47、 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 Surface Contamination At least one sample from each lot. SAE INTERNATIONAL AMS4921N Page 7 of 8 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report show
48、ing producer identity, country where the metal was melted (i.e., 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 properties, microstructure, and surface contamination of each lot, ultrasonic quality of each bar, rod and forging stock when Class 2 is specified and required, and stating that the product conforms to the other
