1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2012 03 06 N Status No replacement or usage G. Weber, NA 2003 10 16 Revised Para 3.0 inserted; para 3.1, 3.8 and 4 deleted 1989 09 12 NE01E10000474054 Release J. C. Webster NAAO, N. Riley EAO Controlled document at www.MATS Copyright 2
2、012, Ford Global Technologies, Inc. Page 1 of 2 SINTERED IRON - CHROMIUM, MANGANESE, NICKEL, ALLOY WSE-M10A91-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a sintered and heat treated chromium manganese nickel steel. 2. APPLICATION This specification was rele
3、ased originally for exhaust valve seat inserts 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 Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSIT
4、ION (weight %) (ASTM A 751/ASTM E 1019/ASTM A 484) Total Carbon 1.50 - 2.00 Combined Carbon 1.40 - 2.00 Chromium 4.00 - 6.50 Manganese 1.00 - 2.70 Copper 2.50 - 4.00 Nickel 1.60 - 2.40 Molybdenum 0.30 - 0.45 Magnesium 0.10 - 0.20 Sulfur 0.03 - 0.06 Nitrogen 0.05 - 0.15 Other 2.0 max Iron Balance 3.3
5、 DENSITY, g/cm3 6.7 min (ISO 2738/ASTM B 328) 3.4 HARDNESS 95 - 110 HRB 3.4.1 Apparent Hardness (ASTM E 18/ISO 4498, average of minimum of five readings made on flat surface of lower face) ENGINEERING MATERIAL SPECIFICATION WSE-M10A91-A Copyright 2012, Ford Global Technologies, Inc. Page 2 of 2 3.4.
6、2 Micro Hardness (ASTM E 384, 50 g load, average of minimum of five readings taken on a traverse perpendicular to the seat face to a depth of 1.5 mm) Alloy carbide phase 450 - 850 Knoop Martensitic phase 300 - 700 Knoop 3.5 MICROSTRUCTURE (ASTM E 3/ASTM E 562) The microstructure shall consist of an
7、austenitic alloy with a uniform distribution of carbide phase, manganese sulphide particles, and an inorganic solid lubricant in a tempered martensitic matrix. The austenitic alloy with carbide phase shall constitute 20% to 40% of the area of any radial cross section. The area fraction of inorganic
8、solid lubricant shall constitute 2.0% to 4.0% of any radial cross section. Internal voids shall not exceed 0.25 mm in any dimension when cross sections are examined in the unetched condition. 3.7 SURFACE CONDITION Surfaces shall be free of scale and rust. Nicks, cracks, 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.
