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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication ma
3、y 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: 724-776-4970 (outside USA)
4、Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org AMS 2431/4C AEROSPACE MATERIAL SPECIFICATION Issued APR 1988 Revised MAY 2007 Superseding AMS 2431/4B Peening Media (AWS) Conditioned Stainless Steel Cut Wire Shot RATIONALE This revision adds Cut Wire Shot sizes 80, 96, and
5、116; Figures 1, 2 and 3 were changed. 1. SCOPE 1.1 Purpose The complete requirements for procuring the product shall consist of this document and the latest issue of the basic specification, AMS 2431. 1.2 Application Conditioned stainless steel cut wire shot conforming to this specification is inten
6、ded for use in peening metal surfaces to impart compressive stresses to these surfaces thereby increasing resistance to fatigue and stress-corrosion cracking. Generally, conditioned stainless steel cut wire shot is used on parts where ferrous contamination is undesirable and a media of high durabili
7、ty is required. 2. APPLICABLE DOCUMENTS See AMS 2431. 3. TECHNICAL REQUIREMENTS 3.1 Conditioned stainless steel cut wire shot shall conform to AMS 2431 and the requirements specified herein. 3.2 Composition shall conform to the percentages by weight shown in paragraph 5.2 of SAE J441 (For reference
8、only, see Table 1), and shall be determined in accordance with ASTM E 353. TABLE 1 - COMPOSITION Element min max Carbon Manganese Silicon Phosphorus Sulfur Chromium Nickel - - - - - 17.00 8.00 0.15 2.00 1.00 0.0450.03020.00 10.50 SAE AMS 2431/4C - 2 - 3.3 Hardness shall be 45 HRC minimum, or equival
9、ent, measured in accordance with ASTM E 384 using a 500 gram minimum load for not less than 90% of the readings. Hardness testing shall be performed after the shot has been conditioned for shape. 3.4 Wire Quality Shot shall be manufactured from wire that is free from shear cracks and laps and shall
10、not contain excessive seams or burrs. 3.5 Weight Fifty pieces of the conditioned media shall conform to Table 3; 100 pieces of the media shall conform to Table 4. 3.6 Contamination Shot shall be clean and free of dirt, grit, oil, or grease. 3.7 Quality Requirements Shot shall conform to 3.7.1, 3.7.2
11、, 3.7.3, and 3.7.4, determined in accordance with 3.9.2. 3.7.1 Shape shall be predominantly spherical as a result of conditioning or rounding. 3.7.2 Acceptable Shapes Shapes conforming to Figure 1 shall be in accordance with Table 2. 3.7.3 MargInal Shapes Shapes conforming to Figure 2 are permissibl
12、e to the extent specified in Table 2. 3.7.4 Unacceptable Shapes Shapes conforming to Figure 3 are permissible to the extent specified in Table 2. 3.7.5 Conditioning is accomplished by impacting the as-cut wire cylinders against a hardened target until a predominantly round shape (See Figure 1) has b
13、een obtained. TABLE 2 - SHAPE REQUIREMENTS Shot Size Area per Field Square Inch (mm2) Number of Fields Viewed Number of Marginal Particles All Fields max(1) Number of Unacceptable Particles All Fieldsmax(2) AWS 116 1(645) 3 7 2 AWS 96 1(645) 2 7 2 AWS 80 1(645) 2 10 2 AWS 62 1 (645) 9 63 2 AWS 54 1
14、(645) 7 66 2 AWS 47 1 (645) 5 68 2 AWS 41 1 (645) 4 70 2 AWS 35 0.25 (161) 14 67 2 AWS 32 0.25 (161) 12 60 2 AWS 28 0.25 (161) 7 67 2 AWS 23 0.25 (161) 5 70 2 AWS 20 0.25 (161) 4 76 2 AWS 17 0.0625 (40) 11 70 2 AWS 14 0.0625 (40) 6 60 2 AWS 12 0.0625 (40) 5 68 2 Notes: (1) Maximum number of marginal
15、 shapes is approximately 3% of the total number of particles viewed. (2) Maximum number of unacceptable shapes is approximately 0.1% of the total number of particles viewed. SAE AMS 2431/4C - 3 - 3.8 Size shall conform to the requirements of Table 3 and Table 4, determined in accordance with 3.9.1.
16、TABLE 3 - SIZE REQUIREMENTS Shot Size Wire Diameter Inch Wire Diameter Millimeters Weight of 50 Pieces Grams AWS 116 0.116 0.002 2.946 0.05 5.77 to 7.05 AWS 96 0.096 0.002 2.438 0.05 3.45 to 4.25 AWS 80 0.080 0.002 2.032 0.05 2.09 to 2.55 AWS 62 0.0625 0.002 1.588 0.05 0.98 to 1.20 AWS 54 0.054 0.00
17、2 1.37 0.05 0.65 to 0.79 AWS 47 0.047 0.002 1.19 0.05 0.43 to 0.52 AWS 41 0.041 0.002 1.04 0.05 0.28 to 0.35 AWS 35 0.035 0.001 0.89 0.025 0.18 to 0.22 AWS 32 0.032 0.001 0.81 0.025 0.12 to 0.16 AWS 28 0.028 0.001 0.71 0.025 0.09 to 0.11 AWS 23 0.023 0.001 0.58 0.025 0.045 to 0.060 AWS 20 0.020 0.00
18、1 0.51 0.025 0.035 to 0.045 TABLE 4 - SIZE REQUIREMENTS Shot Size Wire Diameter Inch Wire Diameter Millimeter Weight of 100 Pieces Gram AWS 17 0.017 0.001 0.43 0.025 0.040 to 0.055 AWS 14 0.014 0.001 0.36 0.025 0.015 to 0.030 AWS 12 0.012 0.001 0.30 0.025 0.010 to 0.020 3.9 Test Methods and Procedur
19、es 3.9.1 Size The size of shot shall be determined by the use of a wire with a diameter as specified in Table 3. Fifty pieces of the conditioned media shall meet the weight requirements as shown in Table 3. One hundred pieces of the conditioned media shall meet the weight requirements of Table 4. 3.
20、9.2 Shape Visual evaluation, at a minimum magnification of 10X for sizes CW 23 and larger and a minimum magnification of 30X for sizes finer than CW 23, shall be performed using the areas and number of fields specified in Table 2 for each respective shot size. 4. QUALITY ASSURANCE PROVISIONS See AMS
21、 2431 and the following: 4.1 Sampling and Testing Two samples of approximately 800 grams each shall be selected from separate containers chosen at random from each lot. Each sample shall be split to test quantities as follows: 4.1.1 Composition Not less than two samples from each lot shall be evalua
22、ted. 4.1.2 Hardness Not less than 20 microhardness readings shall be made from each sample with no more than one impression on any one shot. SAE AMS 2431/4C - 4 - 4.1.2.1 Samples for microhardness testing shall be prepared by encapsulating a representative sample of each lot in a plastic mount and p
23、olishing down to nominal half spheres. 4.1.3 Size Two representative samples of not less than 100 grams each shall be used for size evaluation. 4.1.3.1 Alternative methods for size evaluation are permitted provided that they can be correlated to the weight method and are acceptable to purchaser. 4.1
24、.4 Shape A representative sample shall consist of a number of shot, in one layer, which completely fills the areas specified in Table 2. The number of areas, or fields, viewed at 10X or 30X (See 3.9.2) evaluated for each shot size shall be as indicated in Table 2. 4.1.4.1 Alternative methods of insp
25、ection for shape are permitted provided that they can be correlated to the optical method and are acceptable to purchaser. 5. PREPARATION FOR DELIVERY See AMS 2431 and the following: 5.1 Packaging and Identification Steel shot shall be packaged in 40 to 55 pound (18 to 25 kg) units in plastic coated bags or pails. 6. ACKNOWLEDGMENT See AMS 2431. 7. REJECTIONS See AMS 2431. 8. NOTES See AMS 2431. PREPARED BY AMS COMMITTEE “B” SAE AMS 2431/4C - 5 - FIGURE 1 - ACCEPTABLE SHAPES FIGURE 2 - MARGINAL SHAPES FIGURE 3 - UNACCEPTABLE SHAPE
