1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2003 09 12 Revised Para 3.0 inserted; para 3.1, 3.7 and 4 deleted 1993 09 29 C10338491 Released R. Cooper, EAO; P. Lee, NAAO Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 1 of 2 ALUMINUM, SILICON COPPER MA
2、GNESIUM ALLOYS WSD-M2A137-B1 WSD-M2A137-B2 WSD-M2A137-B3 WSD-M2A137-B4 WSD-M2A137-B5 1. SCOPE The materials defined by these specifications are a series of high silicon aluminum alloys suitable for gravity die casting, which contain copper, nickel and magnesium to enhance elevated temperature proper
3、ties. 2. APPLICATION These specifications were released originally for materials used for automotive pistons. Mechanical properties at elevated temperature and wear resistance increase through the grades to B4 and B5, which are recommended for the most arduous applications. 3. REQUIREMENTS 3.0 STAND
4、ARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION (Weight %) B1 B2 B3 B4 B5 Silicon 8.5-10.5 11-13 11-13 14.8-18.0 17-19 Copper 2.0-4.0 0.7-1.5 0.7-1.5
5、 1.9-3.6 0.8-1.5 Iron 0.8 max 0.8 max 0.8 max 0.85 max* 0.8 max Magnesium 0.5-1.5 0.8-1.5 0.8-1.5 0.5-1.0 0.8-1.3 Nickel 1.0 max 0.7-1.3 0.7-1.3 0.35-0.8 1.3 max Manganese* 0.5 max 0.5 max 0.5 max 0.45 max 0.2 max Zinc 1.0 max 0.5 max 0.5 max 0.90 max 0.2 max Titanium 0.25 max 0.25 max 0.25 max 0.20
6、 max 0.25 maxChromium - - - 0.10 - Others each 0.1 max 0.1 max 0.1 max 0.1 max 0.1 max Total others 0.5 max 0.5 max 0.5 max 0.5 max 0.5 maxSodium/ 0.5 max 0.5 max 0.5 max 0.5 max 0.5 max Strontium (Total) Phosphorus * * * * * Aluminum Balance Balance Balance Balance Balance * High performance piston
7、s may require lower iron; iron content must be balanced by Mn content, 2:1 respectively. * Manganese content shall not be less than one-half the iron content. * Primary silicon refinement 0.0025 - 0.005% typical ENGINEERING MATERIAL SPECIFICATIONWSD-M2A137-B1/B5Printed copies are uncontrolled Copyri
8、ght 2003, Ford Global Technologies, Inc. Page 2 of 2 Supplied composition shall fall within the above ranges, and limits will be defined as part of the control plan. The control plan will also include modification, refining elements and processing detail. 3.3 MECHANICAL PROPERTIES (Cast Test Bars) R
9、oom Temperature 3.3.1 Tensile Strength, min B1 & B5 180 MPa (ASTM E 8/ E 8M) B2, B3, & B4 200 MPa Note: Cast test bars shall be processed and coded in a manner comparable to the casting they represent. 3.3.2 Hardness (500 Kg load, 10 mm ball) 90 - 130 HB (ASTM E 10) 3.4 MECHANICAL PROPERTIES (Finish
10、ed Components) Room Temperature 3.4.1 Tensile Strength, min 180 MPa Test bars machined from any location. The engineering drawing may designate a higher value for test bars from specified locations. 3.4.2 Hardness 90 - 130 HB (ASTM E 10) Rockwell F or Rockwell B measurements may be used on the finis
11、hed component in lieu of Brinell readings where section thickness precludes using Brinell impressions. Hardness measurement locations shall be specified on the Engineering Drawing. 3.5 MICROSTRUCTURE (ASTM E 3) B1 and B2: Aluminum rich dendrites in an aluminum silicon eutectic matrix, containing uni
12、formly distributed intermetallic compounds. B3, B4 and B5: Primary silicon crystallites in a acicular aluminum silicon matrix, containing uniformly distributed intermetallic compounds. Silicon particles must be randomly distributed and generally 10 to 50 micrometres in diameter, with no dimension to
13、 exceed 100 micrometres. High performance pistons may require finer silicon particle size. Surface depletion of primary silicon crystals should be kept to a minimum. 3.6 HEAT TREATMENT (T5 or T6) Cool from an elevated temperature casting process or solution heat treatment and then artificially age t
14、o improve mechanical properties or dimensional stability or both. Age for minimum 4 hours, typically 8 - 12 hours at temperatures selected between 195 - 240 C. Maintain selected ageing temperature to +/- 5 C. Specific heating/cooling and ageing practice or any deviation to the above shall form part of the component control plan.
