1、_SAE Technical Standards Board Rules SURYLGHWKDW7KLVUHSRUWLVSXEOLVKHGE6$(WRDGYDQFHWKHVWDWHRI WHFKQLFDODQGHQJLQHHULQJVFLHQFHV7KHXVHRIWKLVUH port is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising WKHUHIURPLVWKHVROHUHVSRQVLELO
2、LWRIWKHXVHUSAE 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 InternationalAll rights reserved. No part of this publication may be reproduced, stored i
3、n 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: 724-776-0790Email: C
4、ustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on thisTechnical Report, please visithttp:/standards.sae.org/AMS7852CAEROSPACEMATERIAL SPECIFICATIONAMS7852REV. CIssued 1980-04Revised 2013-05Reaffirmed 2017-01Superseding AMS7852BColumbium (Niobium) Al
5、loy Sheet, Strip, and Plate,10Hf - 1.0Ti(Composition Similar to UNS R04295)RATIONALEAMS7852C has been reaffirmed to comply with the SAE five-year review policy.1. SCOPE1.1 FormThis specification covers a columbium (niobium) alloy in the form of sheet, strip, and plate.1.2 ApplicationThis material ha
6、s been used typically for parts requiring exposure at ultra-high temperatures, but usage is not limited to such applications. Applications in oxidizing atmospheres necessitate a protective coating.2. APPLICABLE DOCUMENTS: The issue of the following documents in effect on the date of the purchase ord
7、er 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 superseding document has been specified, the last published issue o
8、f that document shall apply.2.1 SAE PublicationsAvailable 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.AMS2242 Tolerances, Corrosion and Heat Resistant Steel, Iron Alloy, Titanium, and
9、 Titanium Alloy Sheet, Strip, and PlateAMS2809 Identification, Titanium and Titanium Alloy Wrought Products2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM E 3 Preparation of Metallogr
10、aphic SpecimensASTM E 8 / E 8M Tension Testing of Metallic MaterialsASTM E 112 Determining Average Grain SizeASTM E 290 Bend Testing Material for DuctilityASTM E 384 Knoop and Vickers Hardness of MaterialsASTM E 2626 Spectrometric Analysis of Reactive and Refractory Metals 3. TECHNICAL REQUIREMENTS3
11、.1 CompositionShall conform to the percentages by weight shown in Table 1. Metallic elements shall be determined by spectrochemical methods in accordance with ASTM E 2626 or by other analytical methods acceptable to purchaser, carbon shall be determined by the combustion method using an infrared det
12、ection system; oxygen, nitrogen and hydrogen shall be determined by the inert gas fusion technique and columbium shall be determined by difference.TABLE 1 COMPOSITIONElement min maxCheck Analysis (3.1.2)Under min or over maxHafnium 9.00 11.00 0.15Titanium 0.70 1.30 0.07Zirconium - 0.70 0.05Tungsten
13、- 0.50 0.03Tantalum - 0.50 0.05Carbon - 0.015 NoneOxygen - 0.0225 (225 ppm) NoneNitrogen - 0.015 (150 ppm) NoneHydrogen - 0.0015 ( 15 ppm) NoneOther Elements, total (3.1.1) - 0.30 NoneColumbium (Niobium) remainder3.1.1 Determination not required for routine acceptance.3.1.2 Check analysis limits are
14、 applicable only to purchaser verification testing; producers test results shall conform to min and max limits of Table 1.3.2 Melting PracticeAlloy shall be multiple vacuum melted using electron beam or consumable electrode practice.3.3 ConditionCold rolled or hot-cold rolled, descaled, and recrysta
15、llized.SAE INTERNATIONAL AMS7852C Page 2 of 6_3.4 PropertiesThe product shall conform to the following requirements:3.4.1 Average Grain SizeShall be as follows, determined by comparison of a polished and etched specimen with the chart in ASTM E 112:3.4.1.1 Sheet and Strip Under 0.160 Inch (4.06 mm)
16、in Nominal ThicknessPredominantly 5 or finer .3.4.1.2 Product 0.160 to 0.750 Inch (4.06 to 19.05 mm) Inclusive in Nominal ThicknessPredominantly 3 or finer .3.4.2 Tensile Properties: Shall be as shown in Table 2, determined in accordance with ASTM E 8 / E 8M.TABLE 2A MINIMUM TENSILE PROPERTIES, INCH
17、/POUND UNITSNominal Thickness, InchesTensile Strength, ksiYield Strength at 0.2% Offset, ksiElongation in 1 inch, %Up to 0.125, incl 54 40.0 20Over 0.125 54 38.0 20TABLE 2B - MINIMUM TENSILE PROPERTIES, SI UNITSNominal Thickness, MillimetersTensile Strength, MPaYield Strength at 0.2% Offset, MPaElon
18、gation in 25.4 mm, %Up to 3.18, incl 372 276 20Over 3.18 372 262 203.4.3 BendingProduct shall have a test sample prepared nominally 0.750 inch (19.06 mm) in width with axis of bending parallel to the direction of rolling. The sample shall be bend tested in conformance with the guided bend test defin
19、ed in ASTM E 290 at 64 to 84 F (18 to 29 C) through an angle of 105 degrees with the speed of bending not less than 1.0 inch (25 mm) per minute. The test fixture supports shall have a minimum contact radius of 0.010 inch (0.25 mm) and the plunger shall have a radius equal to the bend factor shown in
20、 Table 3 times the nominal thickness. The bent sample shall not show evidence of cracking when examined at 15 to 25X magnification.TABLE 3 - BEND FACTORNominal Thickness, Inch Nominal Thickness, Millimeters Bend FactorUp to 0.060, incl Up to 1.52, incl 0.5Over 0.060 Over 1.52 1.03.4.4 Microstructure
21、Shall be as follows, determined at 100X magnification on specimens prepared in accordance with ASTM E 3:3.4.4.1 SegregationProduct shall be free from evidence of unalloyed elements and from segregation of alloying constituents.SAE INTERNATIONAL AMS7852C Page 3 of 6_3.4.4.2 Surface ContaminationProdu
22、ct shall be free from surface contamination; a difference in hardness of 50 points or more 100HK, determined in accordance with ASTM E 384, between the center of the specimen and a point 0.0015 inch (0.038 mm) from any as-supplied surface shall be evidence of surface contamination.3.4.4.3 Recrystall
23、izationProduct shall show recrystallization to the extent specified in Table 4:TABLE 4 - MINIMUM RECRYSTALLIZATIONNominal ThicknessInchesNominal ThicknessMillimeters Recrystallization, %Up to 0.150, incl Up to 3.81, incl 95Over 0.150 to 0.250, incl Over 3.81 to 6.35, incl 90Over 0.250 to 1.000, incl
24、 Over 6.35 to 25.40, incl 853.5 QualityThe product, as received by purchaser, shall be uniform in quality, condition, sound, and free from foreign materials and from imperfections detrimental to usage of the product.3.5.1 Surfaces shall be visually free from oxide or other contamination and shall ha
25、ve a surface appearance comparable to a commercial corrosion-resistant steel No. 1 finish (See 8.4). Additional standards for acceptance shall be as agreed upon by purchaser and vendor (See 8.5).3.5.2 Pits, scratches, or gouges are acceptable if they are not deeper than 0.005 inch (0.13 mm) or 3% of
26、 the product thickness, whichever is less. Surface imperfections may be removed and the affected area blended smoothly into adjacent surfaces provided the tolerances of 3.6 are maintained.3.5.3 Burr height on any edge shall not exceed 5% of the nominal thickness.3.6 TolerancesShall conform to all ap
27、plicable requirements of AMS2242.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionsThe vendor of the product shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirm
28、atory testing deemed necessary to ensure that the product conforms to specified requirements.4.2 Classification of TestsAll technical requirements are acceptance tests and shall be performed on each lot.4.3 Sampling and TestingShall be in accordance with the following: a lot shall be all product of
29、the same nominal thickness from the same heat of alloy processed at the same time and presented for vendors inspection at one time:4.3.1 Tensile PropertiesNot less than two specimens from each lot.SAE INTERNATIONAL AMS7852C Page 4 of 6_4.3.1.1 Specimens for tensile tests of widths 9 inches (229 mm)
30、and over shall be taken with the axis of the specimen perpendicular to the direction of rolling; for widths under 9 inches (229 mm), specimens shall be taken with the axis parallel to the direction of rolling.4.3.2 BendingNot less than one specimen from each lot.4.3.3 MicrostructureNot less than two
31、 specimens from each lot.4.4 ReportsThe vendor of the product shall furnish with each shipment a report showing the results of tests for chemical composition of each heat and for tensile properties, bending, average grain size, and microstructure of each lot, and stating that the product conforms to
32、 the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS7852C, product form, size, and quantity.4.5 Resampling and RetestingIf any specimen used in the above tests fails to meet the specified requirements, disposition of the product may be bas
33、ed on the results of testing two 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 and no additional testing shall be permitted. Results of all tests shall be report
34、ed.5. PREPARATION FOR DELIVERY5.1 IdentificationShall be in accordance with AMS2809.5.2 PackagingThe product shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the
35、product to ensure carrier acceptance and safe delivery.6. ACKNOWLEDGMENTA vendor shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONSProducts not conforming to this specification, or to modifications authorized by purc
36、haser, will be subject to rejection.SAE INTERNATIONAL AMS7852C Page 5 of 6_8. NOTES8.1 A change bar (|) 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 issue of this document. An (R) symb
37、ol to the left of the document title indicates a complete revision of the document, including technical revision. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.8.2 Dimensions and properties in inch/pound units and the Fahrenheit tempe
38、ratures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information.8.3 Terms used in AMS are clarified in ARP 1917.8.4 Commercial corrosion-resistant steel finishes are defined in ASTM A480/A480M or AS4194.8.5 Purchase documents should specify not less than the following:AMS7852CProduct form and size of product desiredQuantity of product desiredAcceptance standards for surface appearance (See 3.5.1).PREPARED BY COMMITTEE “G“SAE INTERNATIONAL AMS7852C Page 6 of 6_
