1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2014 02 12 N Status Replaced by WSS-M2A178-A3 G. Weber, NA 2003 09 22 Revised Para 3.0 inserted; para 3.1, 3.6, 3.7 and 4 deleted 1994 08 26 NE01E10127076137 Released P. Lee, G. Lane Copyright 2014, Ford Global Technologies, Inc. Page 1 of 3
2、ALUMINUM ALLOY, CASTING, THERMALLY TREATED WSE-M2A154-A1 CONDITION NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is an aluminum-silicon-magnesium casting alloy in the solution treated and artificially aged condition. 2. APPLICATION This specification was released
3、originally for materials used in the manufacture of engine cylinder heads. 3. REQUIREMENTS 3.0 STANDARD 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 (
4、Weight Percent) Silicon 6.5 - 7.5 Copper 0.20 max Iron 0.20 max Magnesium 0.25 - 0.45 Nickel 0.05 max Manganese 0.10 max Zinc 0.10 max Titanium 0.08 - 0.25 Chromium 0.01 max Strontium 0.002 - 0.05 Others 0.05 each max 0.5 total max Aluminum Balance Eutectic modification shall be achieved with stront
5、ium additions. The composition shall be selected from within the above range in order to meet castability, soundness, machinability consistency, microstructural and strength requirements. The specific composition limits and foundry practice to meet performance and manufacturing requirements will for
6、m part of the Control Plan for each individual component geometry, and supplier. ENGINEERING MATERIAL SPECIFICATION WSE-M2A154-A1 Copyright 2014, Ford Global Technologies, Inc. Page 2 of 3 3.3 QUALITY 3.3.1 General (ASTM E 155) The finished component must be free from laps, cold shuts, dross, sludge
7、, and shall have 1% eutectic segregation/depletion per microstructural evaluation. Gas holes/porosity and shrinkage porosity radiographic assessment levels, shall be according to methods of the above standard. Visual methods shall be as the following: 3.3.1.1 Critical Areas (Per Engineering Drawing)
8、 In a micrographic sample taken from the locations as described on the Engineering Drawing, the porosity area percent shall be determined visually by taking the average of 10 areas or fields to be specified in Suppliers Control Plan, and on Engineering Drawing, viewed at 100X. At least three of the
9、ten areas shall include near-surface areas. The average shall not be greater than 1.0%, and no single area shall exceed 1.5%. The individual pore size shall not exceed a 2500 square micrometre area with a max length of 70 micrometers, and no two pores shall be closer than 350 micrometers apart. 3.3.
10、1.2 Non-Critical Areas (All areas not designated as “critical“ per Engineering Drawing) Same as above except that the allowable porosity level shall be an average of 1.5% max, and no one area shall exceed 2%. The longest length of the individual pore size shall be less than 150 micrometers with no p
11、ore area larger than 5000 square micrometers. No two pores shall be closer than 300 micrometers apart. 3.3.2 Microstructure (DAS MEASUREMENT PER FLTM-TBD) The microstructure shall consist of primary alpha aluminum, alpha aluminum-silicon eutectic and intermetallic constituents. The silicon component
12、 of the eutectic shall be rounded which indicates modification. Needlelike aluminum intermetallics are not desired. 3.3.2.1 Critical Areas (Per Engineering Drawing) In critical areas the Dendrite Arm Spacing (DAS) shall be a maximum of 35 micrometers when computed as an average of 10 fields at 100X.
13、 The selected areas shall be specified in Supplier Control Plans and on Engineering Drawing. No single field shall exceed a DAS of 50 micrometre. The degree of modification shall be a Level 4 minimum. ENGINEERING MATERIAL SPECIFICATION WSE-M2A154-A1 Copyright 2014, Ford Global Technologies, Inc. Pag
14、e 3 of 3 3.3.2.2 Non-Critical Areas Same as above except that the DAS shall be a maximum of 60 micrometers when computed as an average of ten fields, and no single field shall exceed a DAS of 75 micrometers. The degree of modification shall be a Level 3 minimum. 3.4 MECHANICAL PROPERTIES (T6 Temper,
15、 Test Bars Machined from Components) Tensile and compression test samples shall be machined from the component casting in the designated location(s) per Engineering Drawing. Locations, frequency, and procedures of mechanical testing are outlined in the Engineering Specification and will form part of
16、 the agreed control plan. 3.4.1 Tensile Properties (ASTM B 557M) Deck Face Bolt Boss Tensile Strength, MPa, min 260 240 Yield Strength, MPa, min 200 180 (0.2% offset) Elongation, %, min 2.5 2.0 3.4.2 Compressive Properties, min (ASTM E 9) Yield Strength, MPa, min - 180 (0.2% offset) 3.4.3 Hardness H
17、B 10/500 85 120 All other locations (ASTM E 10/ISO 6506) must be within 10 pts. of deck face but not less than 80 min 3.5 HEAT TREATMENT Components will be subjected to heat treatment to achieve the required mechanical properties. The heat treatment process shall consist of solution heat treatment, water quench, and artificial aging. Exact times and temperatures to be used must be developed by casting supplier to achieve specified mechanical properties.
