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 2014 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:/www.sae.org/technical/standards/AMS2759/11 AEROSPACE MATERIAL SPECIFICATION AMS2759/11 Issued 2005-04 Reaffirmed
5、2014-04 Stress Relief of Steel Parts RATIONALE AMS2759/11 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE: 1.1 Purpose: This specification, in conjunction with the general requirements for steel heat treatment in AMS 2759, establishes requirements for thermal stress reli
6、ef treatments of parts manufactured from the following materials: a. Carbon and Low Alloy Steels b. Tool Steels c. Precipitation Hardening, Corrosion-Resistant and Maraging Steels d. Austenitic Corrosion-Resistant Steels e. Martensitic Corrosion-Resistant Steels 1.2 Application: Stress relief of par
7、ts is performed to reduce residual stresses and thereby improve dimensional stability, decrease warpage during machining, and facilitate subsequent forming operations. It is also performed prior to plating or other chemical processing to prevent cracking during processing. 2. APPLICABLE DOCUMENTS Th
8、e issue of the 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 canceled
9、 and no superseding document has been specified, the last published issue of that document shall apply. 2.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or www.sae.org AMS 2759 Heat Treatment of Steel Parts SAE INTERNATIONAL AMS2759/11 Page 2 of 5 3. TECHNI
10、CAL REQUIREMENTS 3.1 Equipment: Shall conform to AMS 2759. Temperature uniformity of furnaces shall be 25 F (14 C). 3.2 Heating Environment: Use of carbon or ammonia containing atmospheres for stress relieving austenitic stainless steels at 1650 F (899 C), Cycle 1 (see Table 1), is prohibited. 3.3 P
11、eened and Strain Hardened Parts: Unless specified otherwise, parts made from strain hardened material and parts that have been intentionally cold worked, strain hardened, or peened shall not be stress relieved in accordance with 3.4. 3.4 Stress Relieving: When other than pre-plate, or pre-chemical p
12、rocessing stress relieving is specified by a drawing, specification, fabrication outline or purchase order, parts shall be stress relieved by soaking at the temperature specified in Table 1 for the time specified in Table 2. Cooling rate after soaking shall be equivalent to still air cool or slower
13、except as follows: 3.4.1 Parts made from austenitic corrosion-resistant steels, other than 321, 347, any other stabilized grade, 304L, 316L, and any other low carbon grade, after soaking at 1650 F (899 C) (Cycle 1, See Table 1), shall be quenched in water or in another medium which tests have shown
14、to provide sufficiently rapid cooling to preclude carbide precipitation. Alternatively, to minimize warpage, thin parts, not thicker than 0.25 inches (6.35 mm) (minimum dimension of the heaviest section), may be cooled at a rate equivalent to still air cool. 3.5 Pre-Plate Stress Relieving (in Prepar
15、ation for Chemical Processing): Is mandatory for parts which have been both (1) heat treated to 40 HRC or higher (see 8.3), or 180 KSI or higher, and, (2) ground or cold worked (e.g., formed or straightened) after heat treatment. The processor should determine whether the preceding conditions exist
16、(See 8.5). Stress relieving procedure shall conform to 3.5.1 or 3.5.2 or 3.5.3 as applicable. 3.5.1 Parts tempered or aged at 400 F (204 C) or higher: Shall be stress relieved at 375 F (191 C) for four hours minimum. 3.5.2 Parts tempered below 400 F (204 C): Shall be stress relieved at 275 F (135 C)
17、 for five hours minimum (See 8.2). SAE INTERNATIONAL AMS2759/11 Page 3 of 5 3.5.3 Alternative Pre-Plate Stress Relieving: (Not applicable to (1) peened and intentionally cold worked parts, (2) parts made from strained hardened material, as well as (3) parts tempered below 400 F (204 C.) Pre-plate st
18、ress relieving may be performed by soaking at the temperature specified in Table 1 for the time specified in Table 2 provided parts are inspected to ensure dimensional integrity. 3.6 Records: Records shall be in accordance with AMS 2759. 4. QUALITY ASSURANCE PROVISIONS: 4.1 Reports: Processors repor
19、ts shall include the stress relieving time and temperature and shall state that stress relief was performed in accordance with this specification. 5. PREPARATION FOR DELIVERY: See AMS 2759. 6. ACKNOWLEDGMENT: See AMS 2759. 7. REJECTION: See AMS 2759. 8. NOTES: 8.1 Hardness conversion tables for meta
20、ls are presented in ASTM E 140. 8.2 Carburized parts and parts made from alloys such as 52100 and 440C are frequently tempered at temperatures below 375 F (190 C), thus requiring lower stress relief temperatures. 8.3 Terms used in AMS are clarified in ARP1917. 8.4 Dimensions and properties in inch/p
21、ound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as approximate equivalents of the primary units and are presented only for information. 8.5 Purchase documents should specify not less than the following: AMS 2759/11
22、Cycle 1 or Cycle 2 when stress relieving austenitic corrosion-resistant steel If a bright or scale-free surface is required. SAE INTERNATIONAL AMS2759/11 Page 4 of 5 8.5.1 Purchaser should provide the processor with the following information: Alloy Tempering temperature, if below 400 F (205 C) Minim
23、um specified hardness or strength Whether parts were ground, formed, shot peened, cold worked, strain hardened, or straightened after heat treatment. Whether parts were subsequently stress relieved, and if so, the time and temperature used. 8.6 Key Words: Stress relief, steel parts 8.7 Rationale: Th
24、is is a new slash number to AMS 2759 to cover the stress relief of steel parts. PREPARED UNDER THE JUSRISDICTION OF AMS COMMITTEE “E“ AND AMEC SAE INTERNATIONAL AMS2759/11 Page 5 of 5 TABLE 1 Stress Relieving Temperature Alloy Condition Temperature F (C) Carbon & Low Alloy Steels Annealed or Normali
25、zed 1150 to 1225 F (621 to 663 C)Quenched and Tempered 50 F (28 C) below tempering temperature Nitrided 800 F (427 C) Tool Steels Unhardened 1150 to 1225 F (621 to 663 C)Quenched and Tempered 50 F (28 C) below tempering temperature Nitrided 800 F (427 C) Precipitation Hardening Corrosion-Resistant a
26、nd Maraging Steels Age Hardened 100 F (56 C) below aging temperature Austenitic Corrosion-Resistant Steels (300 series) Cycle 1 (see 3.4.1)(1,3) Cycle 2(2,3)All 1650 F (899 C) 700 F (371 C) Martensitic Corrosion-Resistant Steels (400 series) Unhardened 1300 F (705 C) Quenched and Tempered 50 F (28 C
27、) below tempering temperature(1)Cycle 1 provides maximum stress relief, improvement in stress-corrosion resistance and facilitation of subsequent forming operations. It is not intended for dimensional stabilization. (2) Cycle 2 may be used when it is impractical to use the Cycle 1, or after Cycle 1,
28、 or without Cycle 1, to improve dimensional stability. (3)If no cycle is specified, Cycle 1 shall be used. TABLE 2 Soaking Time for Stress Relieving Stress Relieving Temperature F (C) Sensor Type Part Thickness(1)Inch (mm) Minimum Soaking Time(2,3)Hour Up to 650 F (343 C) Working Up to 1.0 in (25.4
29、mm) 2 Over 650 F (343 C) 1 Up to 650 F (343 C) Working Over 1.0 in (25.4 mm) (4) Over 650 F (343 C) (4) Up to 650 F (343 C) Load Up to 1.0 in (25.4 mm) 1 Over 650 F (343 C) 0.5 Up to 650 F (343 C) Load Over 1.0 in (25.4 mm) (4) Over 650 F (343 C) (4) (1)Thickness is the minimum dimension of the heaviest section. (2)The maximum soaking time shall be 2 times the minimum. (3)Soaking time starts when all temperature sensors are within 25 F (14 C) of the specified temperature. (4)The minimum time shall be increased by 0.5 hour for each 0.5 inch (12.7 mm) of thickness over 1 inch (25.4 mm).
