ASTM E1382 PDF
ASTM E() – Standard Test Methods for Determining Average Grain Size Using Semiautomati. Purchase your copy of ASTM E – 97() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. The ASTM Designation: E–97 requires five hundred data points for a given sample and this analysis is time-consuming and tedious for the.
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If directed test lines were used on one, two or three planes, determine the mean of the measurements and any desired anisotropy ratios. For manual stage movement, move the x- e11382 y-stage controls without looking at the image. The grain boundaries astk reasonably well delineated. Graphical data may be produced with either a printer or plotter, as desired. For such specimens, semiautomatic digitizing tablet measurements are preferred. Calibration and Standardization The cementite grain boundary?
Then, make enlargements of the grain structure images using the same enlarger setting.
A third approach is to transfer the microstructural image, test grid image and cursor image to a television xstm. Tape the grid corners to the micrograph or tablet surface to prevent movement during measurement. Digital correction methods for nonuniform illumination may be used subsequently; however, these methods should not be used in lieu of proper microscope alignment and adjustment. Fix each micrograph to the tablet surface, for example using masking tape, to prevent movement during analysis.
A values for the? Similar results can be obtained using alkaline sodium picrate, boiling or electrolytically. L, or the mean lineal intercept intersections per unit length, P length,?
Measure the entire area of the largest observed grain section. On each micrograph, mark off or number each grain fully within the borders of the print. The mean lineal intercept length,?
ASTM E1382 – 97(2015)
This value is equivalent to the mean lineal intercept length,? For counting grain boundary intersections or grains intercepted, a circular test grid, such as described in Test Methods E, may be used.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. In general, the same recommendations as in Test Methods E apply, that is, use a test circle or three concentric circles with a total line length of mm. L value is converted grain size was found to be Summary of Test Method. Automatic Image Analysis The number of intersections of the grain boundaries by the scan lines is determined.
The easiest method is the measurement of intercept lengths of straight test lines in the phase of interest, as described in paragraph 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. Grain contrast 1 and tint etchants 1,2 are very effective because they generally provide full delineation of the grain structure. These measurements are made for a large number of grains, or all of the grains in a given area, within a microscopical?
The mean lineal intercept length of the phase of interest,? L data and Eq A1. The standard deviations for the measurements on each speci? Ap ; or, determine the average grain area on each? Enlargements are easiest to use.
A data and Eq A1. Reference 1 provides guidance for development of prior-austenite grain boundaries.
Alternatively, a greater number of micrographs can be made and analyzed. It should be recognized that slight differences in grain size ratings may be obtained using different methods because different aspects of the grain structure are being assessed. Delete all grains intersecting the test area border asm the image so that partial chord lengths within these grains are not measured. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.