GMKOREA EDS-T-7109-2006 Method of Decarburized Depth Measurement for Steel (VERSION 3).pdf
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1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards METHODSOFDECARBURIZEDDEPTHMEASUREMENTFORSTEEL EDS-T-7109 ISSUED DATE: 1990. 11. 13 REVISED DATE: 2006. 06. 19 VERSION: 3 EDS-T-7109METHODSOFDECARBURIZEDDEPTHMEASUREMENTFORSTEEL PAGE: 1/3 ISSUED DATE: 1990. 11. 13 REVI
2、SED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 1. PURPOSE This standard aims at evaluating the product quality by measuring decarburized depth which affects severely mechanical properties of steels, especially fatigue strength. 2. SCOPE This standard specifies the method of decarburiz
3、ed depth measurement for steel. 3. DEFINITIONS 3.1. Decarburized layer The surface layer of steel where the carbon content is reduced by hot working or heat treating. 3.2. Total decarburized depth Distance from the surface of the decarburized layer to the position where the difference in chemical or
4、 physical properties between the decarburized layer and the core material is no longer determinable. Remark: Chemical properties shall be determined by the microscopic structure and physical properties from the hardness. 3.3. Ferrite decarburized depth Distance from the surface of steel to the posit
5、ion where is exclusively made of ferrite formed by decarburization. 3.4. Decarburized depth specified by residual carbon ratio Distance from the surface to the position where the residual carbon ratio, i.e. the residual carbon content per carbon content of the core material, has a specified value. 3
6、.5. Practical decarburized depth Distance from the surface to the position where practically permissible hardness has been obtained. 4. CLASSIFICATION OF MEASURING METHODS 4.1. Measuring method by microscope Method of measuring decarburized depth by microscope on the section of the test piece after
7、etched. This method shall, in general, be applicable mainly for as cast, as forged, or as rolled, normalized or annealed state. 4.2. Measuring method by hardness test This method shall be applicable mainly for as quenched and quenched-tempered state. Method of measuring the decarburized depth by the
8、 hardness test along the cross sectional plane of the test piece. EDS-T-7109METHODSOFDECARBURIZEDDEPTHMEASUREMENTFORSTEEL PAGE: 2/3 ISSUED DATE: 1990. 11. 13 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 5. MEASURING METHOD BY MICROSCOPE 5.1. Test piece shall be cut at right angl
9、e to the surface and the plane shall be finished by polishing for testing. Care shall be taken in cutting and polishing that these processes may not blunt the edges of the test plane. 5.2. After etching the test plane by an appropriate method for the specific steel, the decarburized depth shall be d
10、etermined under the microscope through the measurement of the decarburized state which shall be decided from the area ratio of ferrite, pearlite or carbide. 5.3. The magnification of the microscope shall range from 100 to 500 and the decarburized depth shall be measured by employing an eye-piece wit
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