1、AEROSPACE MATERIAL SPECIFICATION AMS7848 REV. D Issued 1964-01 Reaffirmed 2010-05 Revised 2015-01 Superseding AMS7848C Tantalum Alloy, Bars and Rods 90Ta - 10W (Composition similar to UNS R05255) RATIONALE AMS7848D is a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specif
2、ication covers a tantalum alloy in the form of bars and rods up through 3.5 inches (88.9 mm), inclusive. 1.2 Application Primarily for parts requiring exposure to ultra-high temperatures. Applications in oxidizing atmospheres necessitate a protective coating. 2. APPLICABLE DOCUMENTS The issue of the
3、 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 subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no super
4、seding document has been specified, the last published issue of that document shall apply. 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. AMS2261 Tolerances
5、, Nickel, Nickel Alloy, and Cobalt Alloy Bars, Rods, and Wire AMS2809 Identification, Titanium and Titanium Alloy Wrought Products _ 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 i
6、s entirely voluntary, and its applicability and suitability for any particular use, 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 ca
7、ncelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International 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, wi
8、thout 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: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, p
9、lease visit http:/www.sae.org/technical/standards/AMS7848D SAE INTERNATIONAL AMS7848D Page 2 of 5 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 Metalli
10、c Materials ASTM E384 Knoop and Vickers Hardness of Materials 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the following percentages by weight shown in Table 1; metallic elements shall be determined spectrochemically, carbon shall be determined conductometrically, oxygen shall be deter
11、mined by the inert gas or vacuum fusion method, nitrogen shall be determined by the Kjeldahl Method or by vacuum fusion, and hydrogen shall be determined by the vacuum fusion or vacuum extraction method: Table 1 - Composition Element min max Tungsten 8.50 11.00 Columbium - 0.10 Molybdenum - 0.030 Ni
12、ckel - 0.010 Iron - 0.010 Carbon - 0.005 Oxygen - 0.010 (100 ppm) Nitrogen - 0.005 ( 50 ppm) Hydrogen - 0.001 ( 10 ppm) Tantalum remainder 3.2 Condition Fully annealed. 3.3 Properties The product shall conform to the following requirements: 3.3.1 Tensile Properties Shall be as specified in Table 2,
13、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 and 0.05 inch/inch/minute (0.05 mm/mm/minute) and maintained wi
14、thin a tolerance of 0.02 inch/inch/minute (0.02 mm/mm/minute) above the yield strain to fracture. Table 2A Inch/pound units Nominal Diameter or Distance Between Parallel Sides Inches Tensile Strength ksi, min Yield Strength at 0.2% Offset ksi, minimum Elongation in 2 Inches or 4D %, minimum Up to 2.
15、000, excl 75 65 15 2.000 to 3.500, incl 70 60 15 SAE INTERNATIONAL AMS7848D Page 3 of 5 Table 2B SI units Nominal Diameter or Distance Between Parallel Sides Millimeters Tensile Strength MPa, min Yield Strength at 0.2% Offset MPa, minimum Elongation in 50.8 mm or 4D %, minimum Up to 50.80, excl 517
16、448 15 50.80 to 88.90, incl 483 414 15 3.3.1.1 Mechanical property requirements for product outside the size range covered by Table 2 shall be agreed upon between purchaser and producer. 3.3.2 Hardness Should be not higher than 235 HV30, or equivalent, determined in accordance with ASTM E384, but th
17、e product shall not be rejected on the basis of hardness if the tensile property requirements are met. 3.4 Quality The product, as received by purchaser, shall be uniform in quality, condition sound, and free from the foreign materials and from imperfections detrimental to usage of the product. 3.5
18、Tolerances Shall conform to all applicable requirements of AMS2261. 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 ri
19、ght to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests Tests for all technical requirements are acceptance tests and shall be performed on each heat or lot as applicable. 4.3 Sampling and Testi
20、ng 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 Composition One sample from each heat, except that for carbon, oxygen, nitrogen, and hydrogen determinations one sample from each lot. 4.3.2 Tensile
21、Property and Hardness Requirements One sample from each lot. SAE INTERNATIONAL AMS7848D Page 4 of 5 4.4 Reports 4.4.1 The producer of the product shall furnish with each shipment a report showing the results of tests for composition of each heat, the results of tests on each lot to determine conform
22、ance to the carbon, oxygen, nitrogen, and hydrogen requirements and for tensile property and hardness requirements, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, lot number, AMS7848D, size, and quantity. 4.4.2 When the
23、 product is outside the range covered by Table 2, 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 specified requirements, disposition of the product may be based on the results of testing three additional spe
24、cimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the product represented and no additional testing shall be permitted. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Identificat
25、ion Shall be in accordance with AMS2809. 5.2 Packaging 5.2.1 Product shall be packed in wooden boxes, or other suitable protective containers of 2000 pounds (907 kg) maximum lifts, to prevent damage to surfaces during shipping and handling. 5.2.2 Product shall be prepared for shipment in accordance
26、with commercial 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 al
27、l quotations 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 A change bar (l) located in the left margin is for the convenience of the user in locating areas wh
28、ere technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in docum
29、ents that contain editorial changes only. 8.2 Terms used in AMS are clarified in ARP1917. 8.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the
30、primary units and are presented only for information. SAE INTERNATIONAL AMS7848D Page 5 of 5 8.4 Purchase document should specify not less than the following: AMS7848D Form and size or part number of product desired Quantity of product desired Property and acceptance requirements from the cognizant engineering organization applicable to sizes outside the size ranges listed in 1.1. PREPARED BY AMS COMMITTEE “G“
