1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 10 09 Revised Updated and renumbered 1990 06 29 C01031537 Revised paras 3.3/3.4 G. Lane EAO/R. Graham NAAO 1989 02 01 SM/ER3160TC Released N. Riley Printed copies are uncontrolled Page 1 of 3 Copyright
2、2002, Ford Global Technologies, Inc. CAST IRON - LOW ALLOY, CHILLED CAMSHAFT WSD-M1A304-A1 CAST IRON - LOW ALLOY, CHILLED CAMSHAFT WSD-M1A304-A2 1. SCOPE The material defined by this specification is a low alloy cast iron suitable for mechanically chilled components. 2. APPLICATION This specificatio
3、n was released originally for material used for camshafts produced by mechanically chilling cams in a shell mold or green sand casting process. Camshafts to this specification approach optimum grey iron machinability in non-mechanically chilled areas. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PR
4、ODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION (Weight Percent) A1 A2 Carbon 3.1 - 3.9 3.1 - 3.9 Silicon 1.5 - 2.5 1.5 - 2.5 Manganese 0.6 - 0.9 0.6 - 0.9 Phosphorus 0.2 m
5、ax 0.2 max Sulphur 0.15 max 0.15 max Chromium 0.35 max 0.35 max Molybdenum 0.15 max 0.8 max Copper 0.2 max 1.0 max ENGINEERING MATERIAL SPECIFICATION WSD-M1A304-A1/A2 Page 2 of 3 Copyright 2002, Ford Global Technologies, Inc. Composition shall be selected generally from within the above range in ord
6、er to meet microstructural, chill depth, chill distribution, machinability and strength requirements. Molybdenum and/or copper may be added to increase matrix hardness without significant increase in carbide content, which would be more detrimental to machining. Specific composition limits and found
7、ry practice to meet performance and manufacturing requirements will form part of an agreed Control Plan for each component. 3.3 MECHANICAL PROPERTIES 3.3.1 Ultimate Tensile Strength (UTS) (ASTM E 8M/ISO 6892) A1 A2 Standard Test Bar, min, MPa 220 230 or Diabolo Test Bar, min, MPa 230 245 (DIN 50109)
8、 Ultimate Tensile Strength should be determined on separately cast test bar. Where practical, test bars machined from components should also exceed the minimum limits. If component UTS is considered a requirement, tensile bar location and ultimate strength requirement shall be specified on the Engin
9、eering drawing. 3.3.2 Hardness (unless otherwise stated on the Engineering drawing) (ASTM E 10/ISO 6506; ASTM E 18/ISO R 80) Finished Camshaft Only (Surface) A1 A2 Cams and Eccentrics HRC 45 min* 45 min* Bearing Journals HB 190-241 235-285 Note: Correction factors for surface curvature are applicabl
10、e on the above HRC values. *Applicable to all chill areas designated on the Engineering drawing. For large volume survey on castings, agreement may be reached between foundry and manufacturing on the position of checking bearing hardness, providing the finished component hardness is met. This agreem
11、ent is to be part of the control plan. ENGINEERING MATERIAL SPECIFICATION WSD-M1A304-A1/A2 Page 3 of 3 Copyright 2002, Ford Global Technologies, Inc. 3.4 MICROSTRUCTURE (Finished Camshaft) 3.4.1 Cam The cam contact surface (within designated chill zone) shall consist of 40% minimum (by area) acicula
12、r carbide, measured at 200 to 250x magnification, representing near eutectic volumes in a matrix of fine lamellar pearlite. Fine isolated interdendritic graphite aggregates are permissible at the nose surface provided the level does not exceed an average of 1% when viewed at 100X on 10 adjacent fiel
13、ds. 3.4.2 Eccentric A similar microstructure to that described above, for cam contact surface, is required at the complete contact surface peripherey. 3.4.3 Bearing The structure of the bearings shall be Type VII flake graphite predominantly distribution A, size 4 (ASTM A 247) and fine lamellar pear
14、lite. Isolated carbides are permitted if discontinuous and mainly globular in form. Note: Carbide content may be assessed using ASTM E562, WSD-M99A4-A or acceptable Image Analysis techniques. In cases of dispute, the referee method of assessment is to be ASTM E562. 3.5 CLEANLINESS The finished component shall be free of loose sand, oxide and scale.
