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/AMS2375E AEROSPACE MATERIAL SPECIFICATION AMS2375 REV. E Issued 1969-05 Reaffirmed 2007-06 Revi
5、sed 2017-07 Superseding AMS2375D Control of Forgings Requiring First Article Approval RATIONALE AMS2375E results from a Five-Year Review and update of this specification that requires hardness surveys and testing (3.2.3.2 and 3.2.3.4) per specifications. 1. SCOPE 1.1 Purpose This specification cover
6、s procedures for obtaining first-article (preproduction) approval of forgings and the controls to be exercised in producing subsequent production forgings. 1.2 Application This procedure has been used typically for forgings which require preproduction approval and where assurance is required that pr
7、oduction lots are of essentially the same metallurgical quality and are produced by the same basic procedures as the forging originally qualified. 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
8、 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 apply. 2.1 SAE Publications A
9、vailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. ARP1917 Clarification of Terms Used in Aerospace Metals Specifications SAE INTERNATIONAL AMS2375E Page 2 of 6 2.2 ASTM Publicat
10、ions 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 A370 Mechanical Testing of Steel Products ASTM E3 Preparation of Metallographic Specimens ASTM E8/E8M Tension Testing of Metallic Materials ASTM E10 B
11、rinell Hardness of Metallic Materials ASTM E18 Rockwell Hardness of Metallic Materials 3. TECHNICAL REQUIREMENTS 3.1 Forging Stock 3.1.1 The forging producer shall determine that the forging stock conforms to the applicable material specification and will yield acceptable forgings. Tests which are c
12、haracteristic of a heat or lot, and that are conducted by the forging stock producer, need not be repeated by the forging producer provided the results of such tests have been supplied by the forging stock producer. 3.1.2 When specified, forging stock shall be procured from sources approved by purch
13、aser of the forgings. 3.2 Preproduction Forgings 3.2.1 Procedure The forging producer shall produce and heat treat to final condition one or more preproduction forgings and shall test a forging or sections thereof to determine conformance to all requirements of the material specification, the drawin
14、g, and any additional requirements specified by purchaser. The preproduction forgings shall be made by the same practices to be used on production forgings and, unless otherwise specified, may be produced as part of the initial production run. A duplicate preproduction forging or the remaining secti
15、on of such forgings shall be submitted to purchaser for confirmatory testing, when requested. 3.2.1.1 When forgings are to be supplied in other than the final heat treated condition, the test forging(s) shall be heat treated to the final heat treated condition of the part. If the as-forged section s
16、ize is too large to achieve proper heat treatment response, the forging, or a section thereof, shall be machined to a configuration of the same equivalent round as that of the heaviest section of the heat treat configuration. 3.2.1.1.1 If the final heat treated condition of the forgings requires a t
17、ensile strength of 200 ksi (1379 MPa) or higher, and the forgings are supplied in a different condition, the producer may excise oversize test coupons from such forgings. Such coupons shall be given the final heat treatment prior to machining to specimen size for testing. 3.2.2 Specimen Locations Th
18、e location(s) of coupons that are to be taken for mechanical property tests and the sections for grain flow examination shall be as specified by purchaser. The forging producer shall perform the required tests on specimens from these locations. If locations are not specified, the forging producer sh
19、all select representative areas for testing and, when required, shall obtain concurrence of purchaser. Mechanical property test specimens shall be taken in the transverse direction whenever practicable unless only longitudinal properties are specified in the material specification. SAE INTERNATIONAL
20、 AMS2375E Page 3 of 6 3.2.3 Properties 3.2.3.1 Grain Flow A representative forging shall be sectioned as indicated on the drawing and the sections suitably etched to show the grain flow. Photographs showing the grain flow pattern shall be made of each section and the photographs shall be identified
21、to indicate the corresponding sections in the forging. The grain flow shall conform to the requirements of the drawing and good forging practice consistent with the part shape, without reentrant flow lines. When the specified alloy is not conducive to good grain flow determination, a substitute allo
22、y or melting practice showing good grain flow and having equivalent forgability shall be substituted and so indicated in the test report. 3.2.3.2 Hardness Hardness surveys in accordance with ASTM A370 for steels or ASTM E10 or ASTM E18 for all metals shall be made across the heaviest section of test
23、 forgings, unless otherwise specified. 3.2.3.3 Microstructure Sections shall be taken from the fully heat-treated forging at the center of the heaviest usable section and at the surface of the heaviest and thinnest sections and prepared for metallographic examination in accordance with ASTM E3. Ther
24、e shall not be any detrimental microstructural abnormalities related to improper forging or heat treating practice or to forging stock quality. Photographs of the microstructures shall be submitted to purchaser and any abnormal microstructural conditions identified. 3.2.3.4 Mechanical Properties Tes
25、t specimens from the representative forging(s) shall be tested in accordance with ASTM A370 for steels or ASTM E8/E8M for all metals and shall meet the specified mechanical properties for the part in the final heat treated condition. 3.3 Process Control Factors Process control factors (see 4.4.2.1),
26、 established for producing forgings of each part number, shall be submitted with the results of tests on the preproduction forging(s); when permitted by purchaser, the process control factors need not be submitted with the test results, but shall be kept on file for review by purchaser. 3.4 Producti
27、on Forgings Shall be produced using the same operations, practices, and process control factors used on the approved preproduction forging(s) (see 4.2.2.1.2). 3.4.1 Production forgings shall not be shipped until the forging producer has received written approval of the preproduction forging(s), unle
28、ss preshipment approval is waived by purchaser. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of forgings 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 pe
29、rform any confirmatory testing deemed necessary to ensure that the forgings conform to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Tests of forging stock and forgings to determine conformance to applicable requirements of the material specification (3.2.1) and to any a
30、dditional requirements specified by purchaser are acceptance tests and shall be performed on each heat or lot, as applicable. Such tests of forging stock shall be performed prior to use of a new heat or lot for production forgings. SAE INTERNATIONAL AMS2375E Page 4 of 6 4.2.2 Preproduction Tests Tes
31、ts of preproduction forgings to determine conformance to all applicable technical requirements of the material specification, to requirements for grain flow (3.2.3.1), hardness (3.2.3.2), microstructure (3.2.3.3), and mechanical properties (3.2.3.4), and to any additional requirements specified by p
32、urchaser are preproduction tests and shall be conducted under the following circumstances: 4.2.2.1 The first production of a new forging. 4.2.2.1.1 At any time, a change is made in forging design or in process control factors (4.4.2). 4.2.2.1.2 Forger shall obtain purchasers concurrence on changes t
33、hat are deemed not to affect preproduction test results. 4.3 Sampling and Testing Shall be as follows; a lot shall be all forgings of the same part number or configuration, opposite hands being considered one configuration, produced from the same heat of forging stock, heated and forged in the same
34、manner, and heat treated in a continuous furnace or in a series of batch-type furnace operations with no change in furnace settings or interruption of power. 4.3.1 For Acceptance Tests As specified on forging drawing, material specification, or quality assurance specification. For forgings supplied
35、in the final heat treat condition, one forging from each lot shall be subjected to destructive testing. On forgings that contain a test prolongation, each prolongation shall be tested unless a sampling plan is agreed upon by purchaser and producer. Each prolongation, and the forging it represents, s
36、hall be given a serial number for identification. 4.3.2 For Preproduction Tests As specified in Section 3, tests shall be performed on the first production of a new forging by a producer and following any change in configuration or forging design. 4.4 Approval 4.4.1 Preproduction forgings and the fo
37、rging procedure shall be approved by purchaser before production forgings are supplied, unless preproduction approval is waived by purchaser. Neither the approval of preproduction forgings and procedures nor the waiver of preproduction approval shall relieve the forging producer of responsibility fo
38、r continued conformance to all requirements. 4.4.2 The forging producer shall establish for each part number or configuration parameters for process control factors that will produce forgings conforming to the requirements of this specification and the material specification. These control factors s
39、hall constitute the approved manufacturing procedures and shall be used for production forgings. If necessary to make any change in parameters for process control factors, the forging producer shall submit for reapproval a statement of the proposed changes and, when requested, perform preproduction
40、tests of revised forgings. Production forgings incorporating the revised operations shall not be shipped prior to receipt of reapproval unless prior approval is waived by purchaser. 4.4.2.1 Process control factors for producing forgings include, but are not limited to, the following: Type (ingot, bl
41、oom, billet, or bar), nominal size (cross-sectional area), shape, and nominal multiple-weight of forging stock; rounds and round-corner-squares of the same nominal cross-sectional area are considered the same shape Inspection and qualification of forging stock Processing sequence or number of operat
42、ions that would result in different cross-sectional structure, grain flow, or working of the metal Type of forging equipment (press, hammer, ring roll, etc.) SAE INTERNATIONAL AMS2375E Page 5 of 6 Description of die configuration, dimensions, and forging pressure Thermal parameters, including heatin
43、g of stock for forging, annealing, and heat treatment of forgings Stress relief procedures, when applicable Protective atmosphere and/or coatings Cleaning operations (e.g., chemical descaling, blasting) Inspection procedures. 4.4.2.1.1 Any of the above process control factors for which parameters ar
44、e considered proprietary by the producer may be assigned a code designation. Each variation in such factors shall be assigned a modified code designation. The producer shall maintain complete records of all proprietary processes and factors. 4.5 Records 4.5.1 Maintenance of Facilities Each forging p
45、roducer shall keep records demonstrating that the facilities used to produce, control, measure, and test forging stock and forgings during manufacture and inspection are properly maintained and are checked for accuracy at stated intervals against acceptable standards for accuracy. Records shall be m
46、aintained on file for not less than seven years, unless otherwise specified by purchaser. 4.5.2 Process Instructions For each forging part number or configuration, opposite hands being considered a single configuration, the forging producer shall prepare and maintain documented instructions defining
47、 the processing methods and routing in manufacturing and inspection cycles. 4.6 Surveillance Visits The forging producer shall, when requested, permit purchasers authorized personnel to survey all facilities and controls related to production of forgings and to review producers control of materials
48、and of chemical and metallurgical processing during production. 4.7 Reports The forging producer shall furnish with the preproduction forging(s) or sections thereof a report showing the results of tests to determine conformance to the technical requirements of this specification, the applicable mate
49、rial specification, and the drawing and shall include photographs of the grain flow and microstructures. The report shall also include the source of forging stock and physical location of the forging producer. 4.8 Resampling and Retesting If any specimen used in the above tests fails to meet specified requirements, disposition of the forgings shall be based on the resampling and retesting requirements of the applicable material specifi
