ASTM EStandard Test Method for Determining Volume 1 95 % Con? dence Interval Multipliers No. of Fields n 5 6 7 8 9 10 11 12 13 ASTM Standard E, using an image analysis routine with Leica .. of Constructional Steel Research 64(11) doi: / ASTM E Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count. Front Cover. American Society for Testing and.
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Standard Test Method f A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Current edition approved April 10, Published June 10, Originally published as E — Last previous edition E — NOTE 1— Table 1 gives the appropriate multiplying factors t for any number of? Summary of Test Method 4. The average point fraction for n measured? This method is applicable only to bulk opaque planar sections viewed with re?
Thus, the method can be applied to any type of solid material from which adequate twodimensional sections can be prepared and observed. Two common types of grids circular or square array are shown in Fig.
Point counting measurements should be completed on adtm Repeated point count measurements on an individual micrograph is not allowed.
However, it should be recorded since it may have an effect upon the precision obtained. Diagrams of two possible grids, one with a circular pattern and one ast, a square pattern, which are recommended for use, are shown in Fig.
Table 2 provides guidelines for this selection.
The values in Table 2 do not correspond to theoretical constraints; but, by using these values, empirical observations asym shown that the method is optimized for a given precision.
The use of —point grid facilitates easy volume percent calculations. This can be achieved by using either a circular grid or a square grid placed at an angle to the microstructural periodicity.
This can be accomplished by moving the x and y stage mechanism a? The value of the multiplier, t, can be found in Table 1.
The equations for calculating these values are as follows: Table 3 gives a guide to the number of? If another method of?
These values were calculated under the assumption that the features have a random distribution upon the metallographic section. Improving the Volume Fraction Estimate This additional effort should reduce the con? A grand average can be calculated by taking the average of the set means in this case. If no sample heterogeneity is indicated that is, the con? In this case, more rigorous statistical signi?
This time estimate can probably be decreased to 15 min after some experience and familiarity with the point counting procedure and the microstructure analyzed are obtained. Precision and Bias 5 Guidelines are given in 7.
ASTM E562 – 11
Guidelines are given in Section 8. Guidelines are given in 9. The point grid, with four times the number of grid points, decreased?
Do not observe the image while translating to a new? To avoid bias, questionable points should be counted as one half. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
ASTM International – Standard References for ASTM E – 11
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