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 theref
2、rom, 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 2014 SAE InternationalAll rights reserved. No part of this publi
3、cation 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: +1 724-776-4970 (outs
4、ide USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS5940DAEROSPACE MATERIAL SPECIFICATIONAMS5940 REV. DIssued 1996-09Revised 2014-05Superseding
5、 AMS5940CAlloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings34Co - 3.0Cr - 28Ni - 3.0Cb(Nb) - 5.5Al - 0.008B - 25.5FeMultiple Melted, High Temperature, Oxidation-Resistant, Low ExpansionSolution Heat Treated, Precipitation-Hardenable(Composition similar to UNS R30783)RATIONALEAMS5940D rev
6、ises Condition (3.3.1.2), Reports (4.4), and is a Five Year Review and update of this specification.1. SCOPE1.1 FormThis specification covers a cobalt-nickel-iron alloy in the form of bars, forgings, flash welded rings, and stock for forging, flash welded rings, or heading.1.2 ApplicationThese produ
7、cts have been used typically for parts requiring a combination of high strength and low expansion properties up to 1300 F (704 C), but usage is not limited to such applications.2. APPLICABLE DOCUMENTSThe issue of the following documents in effect on the date of the purchase order forms a part of thi
8、s 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 of that document shall
9、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.AMS2261 Tolerances, Nickel, Nickel Alloy, and Cobalt Alloy Bars, Rods, and WireAMS2269 Chemical Check An
10、alysis Limits, Nickel, Nickel Alloys, and Cobalt AlloysAMS2371 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steels and Alloys, Wrought Products and Forging StockSAE INTERNATIONAL AMS5940D Page 2 of 9AMS2374 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant
11、Steel and Alloy ForgingsAMS2750 PyrometryAMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and AIIoysAMS2808 Identification, ForgingsAMS7490 Rings, Flash Welded, Corrosion and Heat-Resistant Austenitic Steels, Auste
12、nitic-Type Iron, Nickel, or Cobalt Alloys, or Precipitation-Hardenable Alloys2.2 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 8/E 8MTension Testing of Metallic MaterialsASTM E 18 Roc
13、kwell Hardness of Metallic MaterialsASTM E 21 Elevated Temperature Tension Tests of Metallic MaterialsASTM E 112 Determining Average Grain SizeASTM E 139 Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic MaterialsASTM E 228 Linear Thermal Expansion of Solid Materials with a Pushr
14、od DilatometerASTM E 292 Conducting Time-for-Rupture Notch Tension Tests of MaterialsASTM E 354 Chemical Analysis of High-Temperature, Electrical, Magnetic, and Other Similar Iron, Nickel, and Cobalt AlloysASTM E 1181 Characterizing Duplex Grain Sizes3. TECHNICAL REQUIREMENTS3.1 CompositionShall con
15、form to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 354, by spectrochemical methods, or by other analytical methods acceptable to purchaser.SAE INTERNATIONAL AMS5940D Page 3 of 9TABLE 1 - COMPOSITIONElement min maxCarbonManganeseSiliconPho
16、sphorusSulfurChromium NickelColumbium (Niobium)AluminumBoronIronTitaniumTantalumCopperCobalt-2.526.02.55.00.00324.0-remainder0.030.500.500.0150.0053.530.03.56.00.01227.00.400.050.503.1.1 Check AnalysisComposition variations shall meet the applicable requirements of AMS2269.3.2 Melting PracticeAlloy
17、shall be multiple melted using consumable electrode practice in the remelt cycle. If consumable electrode remelting is not performed in vacuum, electrodes which have been produced by vacuum induction melting shall be used for remelting.3.3 ConditionThe product shall be supplied in the following cond
18、ition:3.3.1 Bars, Forgings, and Flash Welded RingsSolution heat treated and descaled.3.3.1.1 Bars shall be hot finished; round bars shall be ground or turned.3.3.1.2 Bars shall not be cut from plate (Also see 4.4.2)3.3.1.3 Flash welded rings shall not be supplied unless specified or permitted on pur
19、chasers part drawing. When supplied, rings shall be manufactured in accordance with AMS7490.3.3.2 Stock for Forging, Flash Welded Rings, or HeadingAs ordered by the forging, flash welded ring, or heading manufacturer.3.4 Solution Heat TreatmentBars, forgings, and flash welded rings shall be solution
20、 heat treated by heating to a temperature within the range 2025 to 2050 F (1107 to 1121 C), holding at the selected temperature within 25 F (14 C) for a time commensurate with section thickness, and cooling at a rate equivalent to an air cool or faster (See 8.2).3.4.1 Pyrometry shall be in accordanc
21、e with AMS2750.SAE INTERNATIONAL AMS5940D Page 4 of 93.4.2 If forgings are not to be machined all over, heat treatment shall be performed in a suitable protective atmosphere or, when permitted by purchaser, a suitable protective coating may be applied to the forgings in lieu of using a protective at
22、mosphere.3.5 PropertiesThe product shall conform to the following requirements:3.5.1 Bars, Forgings, and Flash Welded Rings3.5.1.1 As Solution Heat Treated3.5.1.1.1 HardnessShall be not higher than 29 HRC, or equivalent (See 8.3), determined in accordance with ASTM E 18.3.5.1.1.2 Average Grain SizeS
23、hall be as follows, determined by the comparative method of ASTM E 112. In case of disagreement, the intercept (Heyn) procedure shall be used.3.5.1.1.2.1 Bars and flash welded rings under 9 square inches (58 cm2) in cross-sectional area shall exhibit average grain size of ASTM No. 5 or finer. Areas
24、of nonrecrystallized grains with an average grain size, determined by the intercept method, of ASTM No. 3 to 5 are permitted but shall not account for more than 20% of the cross-section.3.5.1.1.2.2 Bars and flash welded rings 9 to 50 square inches (58 to 323 cm2), inclusive, in cross-sectional area
25、and all forgings shall exhibit average grain size of ASTM No. 4 or finer. Areas of nonrecrystallized grains with an average grain size, determined by the intercept method, of ASTM No. 2 to 4 are permitted but shall not account for more than 20% of the cross-section.3.5.1.1.2.3 Limitations on duplex
26、grain structures as defined by ASTM E 1181 shall be as agreed upon by purchaser and vendor.3.5.1.2 Response to Heat TreatmentThe product shall have the following properties after being precipitation heat treated by heating to 1550 F 15 (843 C 8), holding at heat for 2 to 4 hours, cooling at a rate e
27、quivalent to an air cool to room temperature, heating to 1325 F 15 (718 C 8), holding at heat for 8 hours 0.5, cooling at a rate of approximately 100 F (56 C) degrees per hour to 1150 F 15 (621 C 8), holding at 1150 F 15 (621 C 8) for 8 hours 0.5, and cooling at a rate equivalent to an air cool (See
28、 8.2).3.5.1.2.1 Tensile Properties3.5.1.2.1.1 At Room TemperatureShall be as shown in Table 2, determined in accordance with ASTM E 8/E 8M.TABLE 2 - MINIMUM ROOM TEMPERATURE TENSILE PROPERTIESProperty ValueTensile StrengthYield Strength at 0.2% OffsetElongation in 4DReduction of Area160 ksi (1103 MP
29、a)105 ksi ( 724 MPa)12%20%SAE INTERNATIONAL AMS5940D Page 5 of 93.5.1.2.1.2 At 1200 F (649 C)Shall be as shown in Table 3, determined in accordance with ASTM E 21 on specimens heated to 1200 F 5 (649 C 3), held at heat for not less than 20 minutes before testing, and tested at 1200 F 5 (649 C 3).TAB
30、LE 3 - MINIMUM 1200 qF (649 qC) TENSILE PROPERTIESProperty ValueTensile StrengthYield Strength at 0.2% OffsetElongation in 4DReduction of Area130 ksi (896 MPa)90 ksi (621 MPa)15%25%3.5.1.2.2 HardnessShall be not lower than 27 HRC, or equivalent (See 8.3), determined in accordance with ASTM E 18. Pro
31、duct shall not be rejected on the basis of hardness if the tensile properties of 3.5.1.2.1.1 are acceptable, determined on product taken from the same sample as that with nonconforming hardness or from another sample with similar nonconforming hardness.3.5.1.2.3 Stress-Rupture Properties at 1200 F (
32、649 C)Shall be as follows; testing of notched specimens and of combination smooth-and-notched specimens shall be performed in accordance with ASTM E 292 and testing of smooth specimens shall be performed in accordance with ASTM E 139:3.5.1.2.3.1 A standard cylindrical combination smooth-and-notched
33、specimen conforming to ASTM E 292, maintained at 1200 F 3 (649 C 2) while a load sufficient to produce an initial axial stress of 85.0 ksi (586 MPa) or higher is applied continuously, shall not rupture in less than 23 hours. The test shall be continued to rupture without change of load. Rupture shal
34、l occur in the smooth section and elongation of this section after rupture, measured at room temperature, shall be not less than 8% in 4D for product 5.0 inches (127 mm) and under in nominal diameter or least distance between parallel sides and shall be reported for product over 5.0 inches (127 mm)
35、in nominal diameter and least distance between parallel sides.3.5.1.2.3.2 As an alternate procedure, separate smooth and notched specimens, machined from adjacent sections of the same piece, with gage sections conforming to the respective dimensions shown in ASTM E 292, may be tested individually un
36、der the conditions of 3.5.1.2.3.1. The smooth specimen shall not rupture in less than 23 hours and elongation after rupture, measure at room temperature, shall be as specified in 3.5.1.2.3.1. The notched specimen shall not rupture in less time than the companion smooth specimen but need not be teste
37、d to rupture.3.5.1.2.3.3 The tests of 3.5.1.2.3.1 and 3.5.1.2.3.2 may be conducted using incremental loading. In such case, the load required to produce an initial axial stress of 85.0 ksi (586 MPa) or higher shall be used to rupture or for 23 hours, whichever occurs first. After the 23 hours and at
38、 intervals of 8 hours minimum thereafter, the stress shall be increased in increments of 5.0 ksi (34.5 MPa). Time to rupture, rupture location, and elongation requirements shall be as specified in 3.5.1.2.3.1.3.5.1.2.4 Mean Coefficient of Linear Expansion: Shall not exceed 7.5 x 10-6inch/inch/qF (13
39、.5 x 10-6mm/mm/C) at 1200 F (649 C) using 77 F (25 C) as the reference temperature, determined in accordance with ASTM E 228.3.5.2 Forging StockWhen a sample of stock is forged to a test coupon and heat treated as in 3.4 and 3.5.1.2, specimens taken from the heat treated coupon shall conform to the
40、requirements of 3.5.1.2.1, 3.5.1.2.2, 3.5.1.2.3, and 3.5.1.2.4. If specimens taken from the stock after heat treatment as in 3.4 and 3.5.1.2 conform to the requirements of 3.5.1.2.1, 3.5.1.2.2, 3.5.1.2.3, and 3.5.1.2.4, the tests shall be accepted as equivalent to tests of a forged coupon.SAE INTERN
41、ATIONAL AMS5940D Page 6 of 93.5.3 Stock for Flash Welded Rings or HeadingSpecimens taken from the stock after heat treatment as in 3.4 and 3.5.1.2 shall conform to the requirements of 3.5.1.2.1, 3.5.1.2.2, 3.5.1.2.3, and 3.5.1.2.4.3.6 QualityThe product, as received by purchaser, shall be uniform in
42、 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 grain flow
43、.3.7 TolerancesBars shall conform to all applicable requirements of AMS2261.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe vendor of the product shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the
44、right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements.4.2 Classification of Tests4.2.1 Acceptance TestsTests for the following requirements are acceptance tests and shall be performed on each heat or lot as applicable:4
45、.2.1.1 Composition (3.1) and mean coefficient of linear expansion (3.5.1.2.4) of each heat.4.2.1.2 Hardness (3.5.1.1.1) and average grain size (3.5.1.1.2) of each lot of bars, forgings, and flash welded rings as solution heat treated.4.2.1.3 Room-temperature tensile properties (3.5.1.2.1.1), hardnes
46、s (3.5.1.2.2), and stress-rupture properties (3.5.1.2.3) of each lot of bars, forgings, and flash welded rings after precipitation heat treatment.4.2.1.4 Tolerances (3.7) of bars.4.2.2 Periodic TestsTests for the following requirements are periodic tests and shall be performed at a frequency selecte
47、d by the vendor unless frequency of testing is specified by purchaser:4.2.2.1 Tensile properties at 1200 F (649 C) (3.5.1.2.1.2) of bars, forgings, and flash welded rings after precipitation heat treatment.4.2.2.2 Ability of forging stock (3.5.2) and of stock for flash welded rings or heading (3.5.3
48、) to develop required properties.4.2.2.3 Grain flow (3.6.1) of die forgings.SAE INTERNATIONAL AMS5940D Page 7 of 94.3 Sampling and TestingShall be as follows:4.3.1 Bars, Flash Welded Rings, and Stock for Forging, Flash Welded Rings, or HeadingIn accordance with AMS2371.4.3.2 ForgingsIn accordance wi
49、th AMS2374.4.3.3 Specific location of specimens from forgings and flash welded rings shall be as agreed upon by purchaser and vendor.4.4 Reports4.4.1 The vendor of bars, forgings, and flash welded rings shall furnish with each shipment a report showing the vendors name and the country where the metal was melted (e.g., final melt in the case of metal processed
