Purchase your copy of ASTM E – 02() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. Find the most up-to-date version of ASTM E at Engineering ASTM E – E – 02 The test methods provide for reporting of specic, distinctive informati.
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Next apply a regular two-dimensional grid to the outlined image. Suppose that measurements indicate that the surface layers each average 3. The values from this calculation 1e181 entered in the seventh column of Table X2.
ASTM E1181 – 02(2015)
Users easily set calibration, choose preparation options and set the desired measurement method. The test methods separate duplex grain sizes into one of two distinct classes, then into specific types within those classes, and provide systems for grain size characterization of each type. Begin by outlining the distinct grain size regions in a given image, either on a transparent overlay placed over the projected image, or directly on a photomicrograph.
If neither of these is practical, then, as an absolute minimum, the area of the specimen to be examined must include one complete traverse from surface to surface of the original plate section. If duplex grain size is suspected in a product too large to be polished and etched as a single specimen, macroetching should be considered as a rst step in evaluation. Use the “Duplex” button asmt start the programs designed to calculate duplex grain sizes. An example of such a histogram is shown in Fig.
An example photomicrograph of a cross-section condition appears in Fig. Use Methods E to determine the average size of the balance of the grains in the specimen.
Estimate the area fraction for the grain size region being evaluated as the number of grid points falling within the region, divided by the total number of grid points that lie within the total image outline the grid must be large enough to completely cover the asstm image. This standard does not purport to address all of the safety concerns associated with its use.
If this is not practical, apply the estimation procedure to as much of the specimen as is reasonable, but recognize that, by not sampling all of the specimen area, some undened bias may be introduced into the estimate.
Historical Version f1181 – view previous versions of standard. Referenced Documents purchase separately The documents listed below are referenced within the subject asm but are not provided as part of the standard.
If microscopic examination is subsequently necessary, individual specimens must be taken to allow estimation of area fractions for the entire product cross-section, and to allow determination of grain sizes representing the entire cross-section zstm well.
The values in the seventh column were summed to give the total intercept length for this evaluation Grain Size Control Panel: A sample application of this procedure appears in Appendix X1, along with formulas for calculating mean intercept lengths, and area fractions. An example photomicrograph of the wide-range condition appears in Fig. If additional traverses can be made, they will improve the precision of the nal area astk estimate.
MSQ ASTM Grain Size Calculation, Grain Size Measurement
Assigning an average grain size value to a duplex grain size specimen does not adequately characterize the appearance of that specimen, and may even misrepresent its appearance. The operator may edit individual images allowing accurate measurements to be made even on difficult samples.
Etch specimens so that all grain boundaries are distinct and easily visible. However, the test methods described here for area fraction estimation may be asgm use in describing duplex grain structures. The area fraction occupied by the ne grain e11811 calculated as the total intercept length in the ne grain region Practice E FIG. Accordingly, the layer depth of 1. For a tubular product, estimates of area fractions made on longitudinal sections are reasonable approximations of the same estimates made on transverse sections.
The grain size and area fraction values shown in that report format correspond to the appearance of the photomicrograph shown. The use of these is described in detail in Methods E The layer depth of 3.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may atm. Calibration is set by clicking on the “Calibrate” choice in the Dialog Menu Bar. All results may be erased by clicking on the “Erase All Results” button.
No other units of measurement are included in this standard. The test grid consists of a square network of grid lines, with a recommended interline spacing of 5 mm. Each photomicrograph is accompanied by the corresponding reporting format for that type of duplex grain size. For comparison of mechanical properties with metallurgical features, or e1181 specification purposes, it may be important to be able to characterize grain size in such materials.
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Any estimates of area fractions arising from this procedure are valid for an entire specimen only if they fulll the requirements of 8. Make at least 10 measurements at different locations of the depth of a given surface layer, and calculate the average depth from those measurements.
The area occupied by the ne grains is what must be determined. An example photomicrograph of the necklace condition appears in Fig. Presentation of the data as a histogram or a frequency plot is also shown. If there is asttm doubt whether a point falls inside or outside the outlined region, count the point as one half.
Use Methods E to determine the satm of the smallest grains found in the specimen, and Methods E1181 to estimate the size of the largest grain found in the specimen. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Further suppose that measurements indicate an average depth of that surface layer of 1. For the coarse grain, the s1181 intercept length of An example of that bimodal ferrite grain size is shown in Fig.