1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 10 09 Revised Updated and renumbered 1995 01 30 Activated Added A6 size 5 and finer. Type C is not permitted. Matrix: Fine grained tempered martensite or bainite with a uniform distribution of fine isol
2、ated carbide particles. A6 Graphite: Shall be predominently Type A and B flakes, size 5 to 8. Small amounts of Type D and E graphite are permissible but shall be held to a minimum. Matrix: Shall consist of an acicular structure and/or partially spheroidized pearlite. Free ferrite or massive carbides
3、 shall be held to a maximum of 5 % of any field viewed at 100x. The steadite constituent shall be uniformly distributed as non- massive particles. Chemical composition shall be secondary to microstructure and physical properties for acceptance or rejection. The castings shall be heat treated for a m
4、inimum of one hour at a temperature of between 580 and 630 C. The actual temperature shall be such that the hardness requirements are met. A7 Graphite: Shall consist of predominantly AFS types D/E with an inter-mixture of random forms A/B, size 5 and finer. Matrix: Shall be composed of close grained
5、 martensite. There shall be free ferrite present. Carbides, if present, shall be uniformly distributed, non-massive and shall not exceed 5 % of any field at 100 diameter magnification. Steadite shall be well distributed in a broken non-continuous network. ENGINEERING MATERIAL SPECIFICATION WSD-M1A30
6、1-A4/A7 Page 3 of 3 Copyright 2002, Ford Global Technologies, Inc. 3.5 TRANSVERSE STRENGTH, min Unless otherwise stated on the drawing A4 517 MPa A5 650 MPa A6 483 MPa A7 440 MPa The transverse strength shall be calculated as follows: 3 L (D/t-1) TS = _ (MPa) w t L = Load (newtons) applied by parall
7、el flat plates in a direction perpendicular to the axis of symmetry passing through the back of ring, sufficient to break the ring. D = Nominal ring diameter, mm. t = Radial wall thickness at the back of the ring, mm. w = Width at the back of the ring, mm. 4. GENERAL INFORMATION The information give
8、n below is provided for clarification and assistance in meeting the requirements of the specification. 4.1 MODULUS OF ELASTICITY, nominal (ISO 6621/2) WSD-M1A301-A4 110 - 145 GPa WSD-M1A301-A5 130 - 160 GPa WSD-M1A301-A6 96 - 124 GPa WSD-M1A301-A7 132 GPa min NOTE: The actual values of modulus are adjusted to match the individual requirements of each ring design.
