FORD FLTM EU-BA 053-1-2000 MICROSCOPICAL METHOD OF MEASURING DECARBURIZATION ON SPRING STEELS.pdf
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1、 FORD LABORATORY TEST METHOD EU-BA 053-01 Date Action Revisions 2000 08 22 Revised Editorial no technical change A. Cockman 2000 05 22 Editorial no technical change A. Cockma n 1993 01 04 Printed copies are uncontrolled Page 1 of 3 Copyright 2000, Ford Global Technologies, Inc. MICROSCOPICAL METHOD
2、OF MEASURING DECARBURIZATION ON SPRING STEELS Application This method is used to determine the depth of decarburization in hardened and tempered spring steels. Chemicals and Apparatus Required 1. Normal metallographic cutting, mo unting, grinding and polishing equipment necessary to take samples fro
3、m the springs and prepare the surface for microscopical examination. 2. 2 % solution of nitric acid in alcohol, or other suitable etching reagent. 3. A microscope capable of magnifying at X100 and being able to be used to make measurements at this magnification. Conditioning and Test Conditions All
4、test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/ - 2 C and 50 +/ - 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. Definitions Complete Decarburization A virtually complet
5、e loss of carbon from the surface layer. (See “Microscopical Method“ for the practical met hod of depth determination. Partial Decarburization Any measurable loss of carbon content less than complete, with respect to the carbon level of the base material. Total Decarburization The sum of both the co
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