1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 03 25 N-STATUS Replaced by WSS-M10A69-C1 G. Weber, FNA 2003 10 14 Revised Para 3.0 inserted; para 3.1, 3.8 and 4 deleted 1988 10 20 Released NE01E10000474026, was ESE-M10A69-A Printed copies are uncontrolled Copyright 2009, Ford Global Te
2、chnologies, Inc. Page 1 of 3 SINTERED CARBON STEEL, HOT FORMED WSE-M10A69-B 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 for connecting rods and caps. 3. R
3、EQUIREMENTS 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 Carbon 0.40 - 0.55 Copper 1.8 - 2.2 Manganese 0
4、30 - 0.50 Phosphorus 0.04 max Sulphur 0.15 max Silicon 0.03 max Chromium 0.09 max Nickel 0.10 max Oxygen 0.050 max Iron 96.4 min 3.3 DENSITY, min 7.80 g/cm3(ASTM B 311 or Ford approved method) 3.3.1 For in-process (IP) testing, the “method“ and “frequency“ of testing shall be specified in the Suppl
5、ier Control Plan, and agreed upon between Ford and the supplier. The component location designated for sampling shall be described in the Engineering Specification. 3.4 HARDNESS, ROCKWELL G 76.0 - 88.5 (ASTM E 18) ENGINEERING MATERIAL SPECIFICATIONWSE-M10A69-B Printed copies are uncontrolled Copyrig
6、ht 2009, Ford Global Technologies, Inc. Page 2 of 3 3.5 MICROSTRUCTURE The part shall have a microstructure consisting of lamellar pearlite and ferrite. Ferrite 50% max Complete Decarburization 0.02 mm max (viewed at 200X) Total Decarburization 0.25 mm max (viewed at 200X) Macro porosity Not permitt
7、ed (viewed at 10X) Surface oxide penetration 0.25 mm max (ASTM B 797) (viewed at 100X) Inclusion length 0.25 mm max (ASTM B 796) (viewed at 100X) 3.5.1 For in-process (IP) testing, test a full cross section as defined by the Engineering Specification. 3.5.2 The sample shall be prepared for metallogr
8、aphic analysis using automated grinding and polishing equipment through 1 micron in accordance with the appropriate sections of ASTM E 3. 3.5.3 The sample shall be etched in accordance with ASTM E 407 using 4% Picral for approximately 30 - 40 seconds. The sample shall be rinsed in water, then ethano
9、l and force air dried. 3.5.4 Ferrite content is to be quantitatively determined in the specified section measuring a minimum of one million square microns to obtain a reasonable % Relative Accuracy (% RA). One of the following methods is to be used: (a) Automatic or semiautomatic image analysis syst
10、em capable of accumulating field measurement data. (b) ASTM E 562 “Determining Volume Fraction by Systematic Manual Point Count“ or equivalent point count method. 3.5.5 Decarburization. The depth of decarburization shall be measured at 200X using a calibrated eyepiece micrometer. The area to be exam
11、ined shall be the inside surface of the top of the two ribs on the supplier logo side of the specimen. The worst field shall be measured. ENGINEERING MATERIAL SPECIFICATIONWSE-M10A69-B Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, Inc. Page 3 of 3 3.6 MICROCLEANLINESSS 3.
12、6.1 Sampling. A part shall be obtained from the pilot forgings which are made before the blend is accepted for production. A section shall be cut from the bolt hole area of the crank end to obtain a surface approximately 12 mm long in the direction of forging and full section perpendicular to the di
13、rection of forging. 3.6.2 Preparation of Specimen. The specimen shall be austenitized and quenched in water to obtain maximum retention of inclusions. The specimen shall be polished to obtain a surface parallel to the forging direction for evaluation. It is important that the inclusions not be pitte
14、d, drafted or obscured. Applicable sections of ASTM Method E3 - Preparation of Metallographic Specimens and E-768 Preparing and Evaluating Specimens for Automatic Inclusion Assessment of Steel are recommended. The specimen shall be examined in the as-polished condition without etching. 3.6.3 Examina
15、tion of Specimens. Using the image analysis system software program for inclusion analysis, measure along the centerline of the polished face in a direction parallel to the forging direction. Measurement shall begin approximately 0.5 mm from the top surface of the rod. Magnification shall be 100X an
16、d a minimum of 6 million square microns shall be surveyed. 3.6.4 Results. The mean inclusion length shall be recorded. If the maximum length exceeds 250 microns the material may be re-blended and retested. 3.7 FATIGUE STRENGTH See ES Specification 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 The constituents used to produce this alloy contain several residual elements. The maximum level of residual elements in the powder shall be defined in the Control Plan.
