1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2012 03 06 N Status No usage or replacement G. Weber, NA 2003 10 16 Revised Para 3.0 inserted; para 3.1, 3.9 and 4 deleted 1990 06 28 NE01E10000474-072 Released J. C. Webster, NAAO; N. Riley, EAO Controlled document at www.MATS Copyrig
2、ht 2012, Ford Global Technologies, Inc. Page 1 of 3 SINTERED NICKEL-MOLYBDENUM STEEL, HOT FORMED WSE-M10A92-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a hot formed sintered steel. 2. APPLICATION This specification was released originally for material used
3、for camshaft lobes. 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 (After Hot Forming), % by Weight (ASTM A 751/SAE J409) C
4、arbon 0.75 - 0.85 Manganese 0.25 max Phosphorus 0.02 max Sulfur 0.03 max Silicon 0.03 max Chromium 0.10 max Nickel 1.75 - 2.00 Molybdenum 0.50 - 0.60 Copper 0.15 max Oxygen (ppm) 400 max Iron Balance No copper addition permitted. 3.3 DENSITY, After Heat Treatment, min 7.76 g/cm3 (ASTM B 311) 3.4 HAR
5、DNESS 630 - 732 HK (ASTM E 384, 500 grams-force at 0.15 - 0.30 mm below the surface) 3.5 MICROSTRUCTURE The microstructure of the hardened and tempered cam lobes shall consist of tempered martensite with a maximum of 15% retained austenite as determined by X-ray diffraction. When examined at 800X -
6、1000X, discontinuous carbide buildup shall not exceed 0.065 mm. A solid carbide layer or continuous network is not permitted. ENGINEERING MATERIAL SPECIFICATION WSE-M10A92-A Copyright 2012, Ford Global Technologies, Inc. Page 2 of 3 3.5.1 Total Decarburization, max 0.13 mm Total decarburization is d
7、efined as complete plus partial decarburization - Where: . Complete decarburization refers to Nil carbon. . Partial decarburization refers to between Nil and the core carbon. 3.6 SURFACE FINGER & INTERPARTICLE OXIDES, max 0.13 mm (ASTM B 797) 3.7 IRON CONTAMINATION, max 2% (ASTM B 795) 3.8 MICROCLEA
8、NLINESS 3.8.1 Sampling A part shall be obtained from production forgings. A section shall be cut through the “nose“ region of the cam so that an area of 0.25 - 0.40 mm below the surface at 1.30 mm below the top and bottom shall be the area to be evaluated (See Figure 1). ENGINEERING MATERIAL SPECIFI
9、CATION WSE-M10A92-A Copyright 2012, Ford Global Technologies, Inc. Page 3 of 3 3.8.2 Preparation of Specimen The specimen shall be polished to obtain a parallel surface. It is important that the inclusions not be pitted, drafted or obscured. Applicable sections of ASTM E 3 - “Preparation of Metallog
10、raphic Specimens“ and ASTM E 768 - “Preparation of Evaluating Specimens for Automatic Inclusion Assessment of Steel“ are recommended. The specimen shall be examined in the as-polished condition without etching. 3.8.3 Examination of Specimen Using an image analysis system and a software program for inclusion analysis, measure Area B. Magnification will be mutually agreed upon between producer and vendor and shall be with a magnification range of 100 X to 150 X. A minimum of 15 fields shall be examined. 3.8.4 Results The total porosity and non-metallic inclusions of Area B shall not exceed 2%.
