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.

Author: Kam Arashikree
Country: Chad
Language: English (Spanish)
Genre: Software
Published (Last): 20 July 2016
Pages: 314
PDF File Size: 7.56 Mb
ePub File Size: 17.50 Mb
ISBN: 232-7-26567-372-4
Downloads: 73143
Price: Free* [*Free Regsitration Required]
Uploader: Jugrel

The best possible sequence of specimen preparation and etching should be used before relying upon video techniques to further e3182 the image prior to detection.

If an excessively high number of grains are present in the image, measurement precision will be impaired. The measurement area is the sum of the grain interior and grain boundaries between these grains, Ati. Note that of the three principle planes, that is, A?

Prior to automatic image analysis, the grain boundaries should be thinned and the etch pitting must be removed. However, the presence of an equiaxed grain structure in a wrought specimen can only be determined by examination of a plane of polish parallel to the deformation axis.

Measure the area of this grain, Amax, by selecting it with a light pen, ashm, or track ball. Anisotropy indexes for the two perpendicular test orientations on the transverse and planar surfaces revealed values of 0.

With an inverted-type microscope, simply place the specimen face down on the stage plate and hold it in place with the stage clamps. Precision and Bias The simplest is to?

A substantial percentage of the grain boundaries are not visible and the annealing twins are revealed. Intercept and Intersection Counts. However, no corrections are made to the size of the original e182 area and its relationship to the area of the grains included in the measurement is unknown.


ASTM E1382 – 97(2015)

This specimen can be easily measured with a digitizing tablet but substantial image editing would be required for automatic image analysis. For manual stage movement, move the x- and y-stage controls without looking at the image. Prior to analysis, center the light source as described in the operating instructions for the microscope and adjust the? Methods based on the mean intercept length or the number of grain boundary intersections per unit length are directly related to the grain boundary surface area per unit volume, SV.

If the anisotropy index, or other descriptions of the grain shape, was determined see Annex A1report the value s for the plane or planes, or directions evaluated. The grains of interest are detected as described in Easily measured with a digitizing tablet; some image editing would be required for automatic image analysis.

Lis determined using Eq 7. The measurement area, Ati, is then determined by combining the grain boundary and grain interior images, if the number of grains per unit area is to be determined. Reference 1 provides guidance for development of prior-austenite grain boundaries.

When working with a new alloy composition or a new etchant, it may be helpful to measure the grain size as a function of etch time, or other experimental conditions, to develop a reliable practice 10 that agrees with manual determination of the grain size in accordance with Test Methods E A number in parentheses indicates the year of last reapproval.

Such a computation is easy to perform if the data can be read into a spreadsheet type computer program. This ideal range may not always be achievable depending upon the available magni? A values for the? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.


NOTE 2—There are other procedures for dealing with grains that intersect the test area border. These equations measured parameters: Permission rights to photocopy the standard may also be secured from the ASTM website www. A third approach is to transfer the microstructural image, test grid image and cursor image to a television monitor. 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.

ASTM E()_图文_百度文库

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

Calculate the grain size number based on the mean of the measurements using Table 2 or the equations sstm Table 3.

Scratches from grinding, or from polishing with abrasives larger than about 1-? Individual Chord Intercept Lengths.

The grain boundaries should be fully and uniformly delineated. The grain boundaries are reasonably well delineated. Grains ast, the test area border must be deleted see Table 1. There may be other methods or alternate procedures that can produce acceptable results but they must be carefully evaluated before use see It is assumed that when a number of?

Fix each micrograph to the tablet r1382, for example using masking tape, to prevent movement during analysis.

Author: admin