1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 02 2012 03 06 N Status No usage or replacement G. Weber, NA 2003 10 15 Revised Para 3.0 inserted; para 3.1, 3.7 and 4 deleted 1989 09 27 SM/ER8820TC Released W. Jones, N. Riley Controlled document at www.MATS Copyright 2012, Ford Global T
2、echnologies, Inc. Page 1 of 2 SINTERED IRON - MOLYBDENUM INFILTRATED WSD-M10A87-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a sintered molybdenum steel with copper infiltration. 2. APPLICATION This specification was released originally for intake valve seat
3、 inserts for internal combustion engines. Applications also may include exhaust valve seat for internal combustion engines. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Mater
4、ials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION (weight %) (ASTM A 751/ASTM E 1019/ASTM A 484) Total Carbon 0.9 1.3 Molybdenum 0.3 0.8 Copper 10.0 20.0 Others, max 2.0 Iron Remainder Specific composition limits, composition determination procedures, and processing route to meet performance and manuf
5、acturing requirements will form part of an agreed control plan for each component. 3.3 DENSITY, min 7.2 g/cm3 (ISO 2738/ASTM B 328) 3.4 APPARENT HARDNESS, (ASTM E 18) 95 - 110 HRB (ISO 4498) (values for guidance only) 250 - 400 HV5 3.5 MICROSTRUCTURE The microstructure shall consist of a pearlitic l
6、ow alloy steel matrix. Interconnected porosity shall be uniformly distributed throughout and be substantially filled with copper alloy. Molybdenum rich zones shall be present at the original particle boundaries with iron carbide in the form of a grain boundary network. Intergranular oxide film is no
7、t permitted. ENGINEERING MATERIAL SPECIFICATION WSD-M10A87-A Copyright 2012, Ford Global Technologies, Inc. Page 2 of 2 Phase identification and distribution will be controlled by reference to photomicrographs representing structures of seats for which approval is originally given. These photomicrog
8、raphs will form part of the agreed control plan. 3.6 SURFACE CONDITION Surfaces shall be free of scale and rust. Nicks, intrusions, burrs and depressions shall not exceed 0.25 mm in any direction. Visual inspection is to be performed under white light without the aid of magnification. 5. GENERAL INF
9、ORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 RADIAL CRUSHING STRENGTH A valve seat blank shall be loaded in a compressive manner between parallel plattens, axis of load direction to be centrally through the t
10、est piece diameter. Load application shall be at a uniformly progressive rate avoiding any form of shock or impact loading, 2 - 10 mm/minute. The radial crushing strength shall be computed from the cross sectional area of the test piece and load to fracture. Rupture strength K = D + d P - x - D - d s where D = outside diameter; d = inner diameter; P = load to breakage; s = cross section area Typical strength 1030 MPa NOTE: Attention shall be taken of test piece cross section profile, thin or irregular section may give lower values than a uniform section.
