1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2004 10 19 RE-ACTIVATED Para 3.0 inserted; para 3.1 deleted R. Cooper 1996 10 03 INACTIVATED K. Thurgood 1987 10 28 SM/ER1250TC Released N. P. Riley, EAO Printed copies are uncontrolled Copyright 2004, Ford Global Technologies, LLC Page 1 of 3
2、 CARBIDE CONTENT, CHILL AND HARDENABLE CAST WSD-M99A4-A IRON MICROSTRUCTURES 1. SCOPE This document presents a series of photomicrographs of carbidic cast iron microstructures representing a range of carbide contents. 2. APPLICATION This specification was released to assist in the rapid assessment o
3、f specific carbide contents required by individual Engineering Materials Specifications for chill or hardenable cast irons such as camshafts and tappets. More comprehensive volume contents may be determined by accepted image analysis techniques. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTI
4、ON MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 METALLOGRAPHIC PREPARATION (ASTM A 247) Metallographic sections shall be taken from individual components representing the critical area as identified
5、by the relevant materials specification and component drawings. Preparation of the section shall be in accordance with good metallographic practice for example ASTM A 247. Structures are to be etched in Nital to give similar contrast to attached photomicrographs. 3.3 EXAMINATION PROCEDURE (ASTM E 2)
6、 Comparison shall be made between the prepared section and the photomicrographs contained in this specification. Viewing shall be in accordance with ASTM E 2 at a magnification of 100 times or in the case of vastly different sized carbides, the dendrite size may be adjusted to similar proportions by
7、 changing the magnification between 50 and 500 times. ENGINEERING MATERIAL SPECIFICATIONWSD-M99A4-A Printed copies are uncontrolled Copyright 2004, Ford Global Technologies, LLC Page 2 of 3 5% Carbide 10% Carbide 7% Carbide 15% Carbide ENGINEERING MATERIAL SPECIFICATIONWSD-M99A4-A Printed copies are uncontrolled Copyright 2004, Ford Global Technologies, LLC Page 3 of 3 25% Carbide 40% Carbide 30% Carbide 60% Carbide
