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    STP504

    Practical Applications of Quantitative Metallography

    Published: 0


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    Abstract

    An improved procedure based on the intercept method of measuring the grain size of single-phase microstructures has been developed that provides a quantitative description of the grain size yet is fast. The procedure combines the statistical advantage of using large numbers with the advantage of interpreting the data as a normal distribution, as verified by the chi square test. Application of the procedure to ferritic microstructures representative of best and worst case conditions indicates that accuracies on the order of 3 percent at a 95 percent confidence level can be achieved. In addition, the procedure is sensitive enough to distinguish a randomly mixed duplex grain structure. The measurements associated with a two-phase microstructure can be more precisely quantified through determination of volume fractions using a Pp measurement based on the use of an appropriate grid network, the coefficient of variation statistic, and the Poisson distribution. The analysis is demonstrated for an a priori system for which the percent accuracy and confidence level can be specified for the volume fraction measurement simply from calculation of the average value for Pp.

    Keywords:

    metallography, microstructure, grain structure, grain size, quantitative analysis, statistical analysis, normal density functions, chi square test, ferrite


    Author Information:

    Abrams, H
    Research Engineer, Homer Research Laboratories, Bethlehem Steel Corporation, Bethlehem, Pa.


    Committee/Subcommittee: E04.14

    DOI: 10.1520/STP36848S