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/AMS7857CAEROSPACEMATERIAL SPECIFICATIONAMS7857REV. CIssued 1980-04Revised 2013-05Reaffirmed 2017-01Superseding AMS7857BColumbium (Niobium) Al
5、loy Bars, Rods, and Extrusions10Hf - 1.0Ti, Recrystallization Annealed(Composition similar to UNS R04295)RATIONALEAMS7857C 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 bars, rods, and extrusion
6、s.1.2 ApplicationThis material has 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 DOCUMENTSThe issue of the following documents in effect
7、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 superseding document has been specif
8、ied, the last published issue of 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.AMS2809 Identification, Titanium and Titanium Alloy
9、 Wrought Products2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959Tel: 610-832-9585, www.astm.org.ASTM E 3 Preparation of Metallographic SpecimensASTM E 8 / E 8M Tension Testing of Metallic MaterialsASTM E 18 Rockwell Hardn
10、ess and Rockwell Superficial Hardness of Metallic MaterialsASTM E 112 Determining Average Grain SizeASTM E 384 Knoop and Vickers Hardness of MaterialsASTM E 2626 Spectrometric Analysis of Reactive and Refractory Metals3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the following percentages
11、 by weight shown in Table 1. Metallic elements shall be determined by spectrochemical methods in accordance with ASTM E 2626, carbon shall be determined by the combustion method using an infrared detection system; oxygen, nitrogen and hydrogen shall be determined by the inert gas fusion technique, a
12、ndcolumbium 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 - 0.50 0.03Tantalum - 0.50 0.05Carbon - 0.015 NoneOxygen - 0.0225 (225 ppm) NoneNitrogen - 0.015 (1
13、50 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 applicable only to purchaser verification testing; producers test results shall conform to min and
14、 max limits of Table 1.3.2 Melting PracticeAlloy shall be multiple melted under vacuum, using electron beam or consumable electrode practice.3.3 ConditionHot or cold finished, descaled, and recrystallization annealed.SAE INTERNATIONAL AMS7857C Page 2 of 7_3.4 PropertiesThe product shall conform to t
15、he following requirements:3.4.1 Average Grain SizeShall be as shown in Table 2, determined by comparison of a polished and etched specimen with the chart in ASTM E 112. TABLE 2 GRAIN SIZENominal Diameter or Least Distance Between Parallel Sides Average Grain SizeInches MillimetersUp to 2.0, incl Up
16、to 51, incl 5 or finerOver 2.0 to 4.0, incl Over 51 to 102, incl 4 or finerOver 4.0 Over 102 3 or finer3.4.2 Tensile PropertiesShall be as shown in Table 3, determined in accordance with ASTM E 8 / E 8M:TABLE 3 MINIMUM TENSILE PROPERTIESProperty ValueTensile Strength 54 ksi (372 MPa)Yield Strength a
17、t 0.2% Offset 35.0 ksi (241 MPa)Elongation in 4D 15%Reduction of Area 30%3.4.3 HardnessShall be not higher than 95 HRB, or equivalent (See 8.3), determined in accordance with ASTM E 18, but the product shall not be rejected on the basis of hardness if the tensile property requirements are met on a s
18、pecimen with similar nonconforming hardness.3.4.4 MicrostructureShall 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.3.4.4.2 S
19、urface ContaminationProduct shall be free from surface contamination; a difference in hardness of 50 or more points HK100, 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 construed as evidence of su
20、rface contamination.3.4.4.3 RecrystallizationProduct shall exhibit not less than 95% recrystallization.3.5 QualityThe 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.SAE IN
21、TERNATIONAL AMS7857C Page 3 of 7_3.5.1 Surfaces of product shall be visually free from oxide or other contamination. Pits, scratches, or gouges are acceptable provided they are not deeper than 0.005 inch (0.13 mm) or 3% of the product thickness, whichever is less. Surface imperfections may be remove
22、d and the affected area blended smoothly into adjacent surfaces provided the tolerances of 3.6 are met.3.6 TolerancesShall be as follows:3.6.1 Round Bars and RodsShall be as shown in Table 4.TABLE 4A DIAMETER TOLERANCES, ROUND BARS AND RODS, INCH/POUND UNITSNominal DiameterInchesTolerance, InchplusT
23、olerance, InchminusOut of RoundInch0.62 to 0.281, incl 0.002 0.002 0.004Over 0.281 to 0.422, incl 0.010 0.005 0.008Over 0.422 to 0.625, incl 0.010 0.005 0.012Over 0.625 to 0.875, incl 0.015 0.005 0.015Over 0.875 to 1.000, incl 0.020 0.005 0.015Over 1.000 to 1.375, incl 0.020 0.010 0.018Over 1.375 to
24、 1.500, incl 0.020 0.015 0.020Over 1.500 to 1.625, incl 0.025 0.015 0.020Over 1.625 to 2.000, incl 0.030 0.020 0.025Over 2.000 to 2.500, incl 0.032 0.032 0.025Over 2.500 to 3.250, incl 0.032 0.032 0.027Over 3.250 to 3.500, incl 0.045 0.045 0.040TABLE 4B DIAMETER TOLERANCES, ROUND BARS AND RODS, SI U
25、NITSNominal DiameterMillimetersTolerance, mmplusTolerance, mmminusOut of Roundmm1.57 to 7.14, incl 0.05 0.05 0.10Over 7.14 to 10.72, incl 0.25 0.13 0.20Over 10.72 to 15.88, incl 0.25 0.13 0.30Over 15.88 to 22.22, incl 0.38 0.13 0.38Over 22.22 to 25.40, incl 0.51 0.13 0.38Over 25.40 to 34.92, incl 0.
26、51 0.25 0.46Over 34.92 to 38.10, incl 0.51 0.38 0.51Over 38.10 to 41.28, incl 0.64 0.38 0.51Over 41.28 to 50.80, incl 0.76 0.51 0.64Over 50.80 to 63.50, incl 0.81 0.81 0.64Over 63.50 to 82.55, incl 0.81 0.81 0.69Over 82.55 to 88.90, incl 1.14 1.14 1.023.6.2 Square and Rectangular Bars and Rods3.6.2.
27、1 ThicknessShall be as shown in Table 5.SAE INTERNATIONAL AMS7857C Page 4 of 7_TABLE 5 THICKNESS TOLERANCES, SQUARE AND RECTANGULAR BARSNominal Thickness (T)InchesNominal Thickness (T)MillimetersTolerancePlus and MinusInchTolerancePlus and MinusMillimeters0.187 to 0.500, incl 4.75 to 12.70, incl 0.1
28、0T 0.10TOver 0.500 Over 12.70 0.062 1.573.6.2.2 WidthShall be +10%, -0.3.6.3 ExtrusionsShall be as agreed upon by purchaser and vendor.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe vendor of the product shall supply all samples for vendors tests and shall be responsible for the
29、 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 TestsAll technical requirements are acceptance tests and shall be performed on each
30、heat or lot as applicable.4.3 Sampling and TestingShall be not less than the following; a lot shall be all product of one size and configuration from a single heat of alloy processed at one time and presented for vendors inspection at one time:4.3.1 CompositionOne specimen from each heat.4.3.2 Tensi
31、le PropertiesTwo specimens from each lot. Specimens shall be taken with the axis parallel to the direction of rolling or extruding.4.3.3 HardnessTwo specimens from each lot. Hardness may be determined on the tensile specimens.4.3.4 Grain SizeOne specimen from each lot.4.3.5 MicrostructureTwo specime
32、ns from each lot.SAE INTERNATIONAL AMS7857C Page 5 of 7_4.4 ReportsThe vendor of the product shall furnish with each shipment a report showing the results of tests for the composition of each heat, and for the tensile properties and average grain size of each lot, and stating that the product confor
33、ms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS7857C, 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 b
34、e based 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 r
35、eported.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
36、 the 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. REJECTIONSProduct not conforming to this specification, or to modifications authorized by
37、purchaser, will be subject to rejection.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) symbol to the left of the document titl
38、e 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 are primary; dimensions and properties in SI units are show
39、n as the approximate equivalents of the primary units and are presented only for information.8.3 Hardness conversion tables for metals are presented in ASTM E 140.8.4 Terms used in AMS are clarified in ARP1917.SAE INTERNATIONAL AMS7857C Page 6 of 7_8.5 Purchase documents should specify not less than the following:AMS7857CProduct form and size of product desiredQuantity of product desired.PREPARED BY COMMITTEE “G“SAE INTERNATIONAL AMS7857C Page 7 of 7_
