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/AMS4935L AEROSPACE MATERIAL SPECIFICATION AMS4935 REV. L Issued 1959-06 Revised 2017-09 Superse
5、ding AMS4935K Titanium Alloy Extrusions and Flash Welded Rings 6Al - 4V Annealed Beta Processed (Composition similar to UNS R56400) RATIONALE AMS4935L results from a Five-Year Review and update of this specification that adds ASTM E2994 (3.1), revises cooling rate after stress relief (3.4.3), and ad
6、ds reporting (4.4.3) and identification (5.1) requirements for material outside specification limits. 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of extruded bars and shapes, flash welded rings 3.000 inches (76.20 mm) and under in nominal diameter or least distance betwe
7、en parallel sides, and stock for flash welded rings. 1.2 Application These products have been used typically for parts that do not require heat treatment but require high mechanical properties in the annealed condition and for which processing above the beta transus is permissible, but usage is not
8、limited to such applications. This alloy exhibits high strength-to-weight ratios up to 750 F (399 C). 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 supplier may work to a
9、 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 International, 400 Commonwe
10、alth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2245 Tolerances Titanium and Titanium Alloy Extruded Bars, Rods, and Shapes AMS2249 Chemical Check Analysis Limits Titanium and Titanium Alloys AMS2750 Pyrometry SAE INT
11、ERNATIONAL AMS4935L Page 2 of 7 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 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor
12、 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 E539 Analysis of Titanium Alloys by X-Ray Fluorescence Spectrometry ASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by Iner
13、t 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 ASTM E2371 Analysis of Titanium and Titanium Alloys by Direct
14、 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 weight s
15、hown 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 E539, ASTM E2371, or ASTM E2994. Other analytical methods may be used if acceptable to the
16、purchaser. Table 1 - Composition Element Min Max Aluminum Vanadium Iron Oxygen Carbon Nitrogen Hydrogen Yttrium (3.1.1) Other Elements, each (3.1.1) Other Elements, total (3.1.1) Titanium 5.50 3.50 - - - - - - - - remainder 6.75 4.50 0.30 0.20 0.10 0.05 0.0125 0.005 0.10 0.40 (500 ppm) (125 ppm) ( 5
17、0 ppm) 3.1.1 Determination not required for routine acceptance. 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2249. SAE INTERNATIONAL AMS4935L Page 3 of 7 3.2 Melting Practice Alloy shall be multiple melted. The first melt shall be made by vacuum consumable
18、 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 remelting (VAR) practice. Alloy additions are not permitted in the final melting cycle. 3.2.1 The atmosphere for nonconsumable elect
19、rode melting shall be vacuum or shall be inert gas at a 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 and Shapes Extruded, annea
20、led, straightened, and descaled. Cut plate shall not be supplied in lieu of bar. 3.3.2 Flash Welded Rings Shall not be supplied unless specified or permitted on purchasers part drawing. When specified, rings shall be manufactured in accordance with AMS7498 and annealed. 3.3.3 Stock for Flash Welded
21、Rings As ordered by the flash welded ring manufacturer. 3.4 Annealing Product shall be annealed as follows: Pyrometry shall be in accordance with AMS2750. 3.4.1 Flash Welded Rings Flash welded rings shall be annealed by heating to a temperature within the range 1300 to 1400 F (704 to 760 C), holding
22、 at the selected temperature within 25 F (14 C) for a time commensurate with section thickness and the heating equipment and procedure used, and cooling at a rate that will produce product meeting the requirements of 3.5. 3.4.2 Bars and Shapes (Extrusions) Bars and shapes shall be annealed in accord
23、ance with 3.4.2.1 or 3.4.2.2. 3.4.2.1 Bars and shapes shall be annealed by heating to a temperature within the range 1300 to 1400 F (704 to 760 C), holding at the selected temperature within 25 F (14 C) for a time commensurate with section thickness and the heating equipment and procedure used, and
24、cooling at a rate that will produce product meeting the requirements of 3.5. 3.4.2.2 Alternate Processing Method when permitted by the Cognizant Engineering Organization (see 8.5) After cooling from the extrusion process, bars and shapes may be hot stretch straightened by heating to within an operat
25、ing range of 1150 to 1250 F (620 to 677 C) for a time commensurate with section thickness and the heating equipment and procedure used and cooling at a rate that will produce product meeting the requirements of 3.5. 3.4.3 Straightening Straightening may be performed in conjunction with annealing. If
26、 any straightening or stretching operations are performed on extrusions below 1050 F (566 C), the extrusions shall be stress relieved by heating to a temperature within the range 1050 to 1200 F (566 to 649 C), holding at the selected temperature within 25 F (14 C) for 1 to 2 hours, and cooling at a
27、rate that will produce product meeting the requirements of 3.5. SAE INTERNATIONAL AMS4935L Page 4 of 7 3.4.4 Bars, shapes, and flash welded rings shall be descaled by wet or dry abrasive blasting, by chemical procedures, or by other methods approved by purchaser. 3.5 Properties The product shall con
28、form to the following requirements: 3.5.1 Bars, shapes, and flash welded rings. 3.5.1.1 Tensile Properties Product, 3.000 inches (76.20 mm) and under in nominal diameter or least distance between parallel sides, shall have the properties shown in Table 2, determined in accordance with ASTM E8/E8M on
29、 specimens as in 4.3.1.2 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 tensile properties Property Value Tensile Strength 130 ksi (896
30、 MPa) Yield Strength at 0.2% Offset 120 ksi (827 MPa) Elongation in 2 Inches (50.8 mm) or 4D Longitudinal Long-Transverse 10% 8% Reduction of Area Longitudinal Long-Transverse 20% 15% 3.5.1.1.1 Tensile property requirements apply in both the longitudinal and transverse directions, but testing in the
31、 transverse direction need be done only on product that a specimen not less than 2.50 inches (63.5 mm) in length can be taken. Tests in the transverse direction are not required on product tested in the longitudinal direction. 3.5.1.1.2 Mechanical property requirements for product outside of the ran
32、ge covered by 1.1 shall be agreed upon between purchaser and producer. 3.5.1.2 Compressive Properties Bar and shapes shall show a longitudinal compressive yield strength equal to or greater than the specified yield strength in tension. 3.5.1.3 Surface Contamination Except as permitted by 3.5.1.3.1 a
33、nd 3.5.1.3.2, the product shall be free of any oxygen-rich layer, such as alpha case (see 8.2), or other surface contamination, determined by microscopic examination at not lower than 400X minimum magnification or by other method agreed upon by purchaser and producer. 3.5.1.3.1 An oxygen-rich layer
34、not greater than 0.001 inch (0.025 mm) in depth will be permitted on extrusions other than round. 3.5.1.3.2 When permitted by purchaser, extrusions and flash welded rings to be machined all over may have an oxygen-rich layer provided such layer is removable within the machining allowance. 3.5.1.4 Mi
35、crostructure Shall be uniform and essentially that structure resulting from beta processing. Microstructure shall not be cause for rejection unless standards have been agreed upon by purchaser and producer. SAE INTERNATIONAL AMS4935L Page 5 of 7 3.5.2 Stock for Flash Welded Rings A sample of stock h
36、eat treated 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 uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the product. 3.7 Tolerances Extrusions shall conform
37、 to all applicable requirements of AMS2245. 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 per
38、form 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 performed on each heat or lot as applicable: 4.2.1.1 Composition (3.1) of each
39、 heat and hydrogen content of each lot. 4.2.1.2 Tensile properties (3.5.1.1), surface contamination (3.5.1.3), and microstructure (3.5.1.4) of each lot of extrusions and flash welded rings. 4.2.1.3 Tolerances (3.7) of extrusions. 4.2.2 Periodic Tests The following requirements are periodic tests and
40、 shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.2.3 Compressive properties (3.5.1.2) of extrusions. 4.3 Sampling and Testing Shall be as follows: A lot shall be all product of the same nominal size from the same heat, processed at
41、the same time, and annealed in the same heat treat batch, 4.3.1 Acceptance Tests 4.3.1.1 Composition One sample from each heat, except that for hydrogen determinations, one sample from each lot obtained after thermal and chemical processing is completed. 4.3.1.2 Tensile Properties and Surface Contam
42、ination At least one sample from each lot. SAE INTERNATIONAL AMS4935L Page 6 of 7 4.3.1.3 Microstructure One or more microstructures from each lot. 4.3.2 For Periodic Tests As acceptable to purchaser. 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report showing the producer ident
43、ity, country where the metal was melted (i.e., final melt in the case of metal processed by multiple melting operations), results of tests for composition of each heat and for the hydrogen content and tensile properties of each lot and stating that the product conforms to the other technical require
44、ments. This report shall include the purchase order number, lot number, AMS4935L, product form and size or part number, specific annealing treatment used, 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. 4.4.3 When ma
45、terial produced to this specification is beyond the sizes allowed in the scope or tables, or other exceptions are taken to the technical requirements listed in Section 3, (see 5.1) the report shall contain a statement “This material is certified as AMS4935L(EXC) because of the following exceptions:“
46、 and the specific exceptions shall be listed. 4.5 Resampling and Retesting If any specimen used in the above tests fails to meet the specified requirements, disposition of the product may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure
47、of any retest specimen to meet the specified requirements shall be cause for rejection of the product represented. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Identification When technical exceptions are taken (see 4.4.3), the material shall be marked with AMS4935L(EXC).
48、5.1.1 Bars and Shapes Shall be 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 applicab
49、le 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 and when acknowledging purchase orders. 7. REJECTIONS Product not conforming to this specification, or to modifications authorize
