Laboratorio De Fisica
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Publicado: 20 de junio de 2012
ASTM grain size number—the ASTM grain size number, G, was originally defined as:
NAE = 2G-1
where NAE is the number of grains per square inch at 100X magnification. To obtain the number persquare millimetre at 1X, multiply by 15.50.
TABLE 4 Grain Size Relationships Computed for Uniform, Randomly Oriented, Equiaxed Grains
|Grain Size No. |NA Grains/Unit Area A |AAverage Grain Area |d Average Diameter |
|G | | ||
| |No./in.2 at 100X |No./mm2 at 1X |mm2 |µm2 |mm |µm |
|00 |0.25 |3.88|0.2581 |258064 |0.5080 |508.0 |
|0 |0.50 |7.75 |0.1290 |129032 |0.3592|359.2 |
|0.5 |0.71 |10.96 |0.0912 |91239 |0.3021 |302.1 |
|1.0 |1.00 |15.50|0.0645 |64516 |0.2540 |254.0 |
|1.5 |1.41 |21.92 |0.0456 |45620 |0.2136|213.6 |
|2.0 |2.00 |31.00 |0.0323 |32258 |0.1796 |179.6 |
|2.5 |2.83|43.84 |0.0228 |22810 |0.1510 |151.0 |
|3.0 |4.00 |62.00 |0.0161 |16129 |0.1270|127.0 |
|3.5 |5.66 |87.68 |0.0114 |11405 |0.1068 |106.8 |
|4.0 |8.00...
NAE = 2G-1
where NAE is the number of grains per square inch at 100X magnification. To obtain the number persquare millimetre at 1X, multiply by 15.50.
TABLE 4 Grain Size Relationships Computed for Uniform, Randomly Oriented, Equiaxed Grains
|Grain Size No. |NA Grains/Unit Area A |AAverage Grain Area |d Average Diameter |
|G | | ||
| |No./in.2 at 100X |No./mm2 at 1X |mm2 |µm2 |mm |µm |
|00 |0.25 |3.88|0.2581 |258064 |0.5080 |508.0 |
|0 |0.50 |7.75 |0.1290 |129032 |0.3592|359.2 |
|0.5 |0.71 |10.96 |0.0912 |91239 |0.3021 |302.1 |
|1.0 |1.00 |15.50|0.0645 |64516 |0.2540 |254.0 |
|1.5 |1.41 |21.92 |0.0456 |45620 |0.2136|213.6 |
|2.0 |2.00 |31.00 |0.0323 |32258 |0.1796 |179.6 |
|2.5 |2.83|43.84 |0.0228 |22810 |0.1510 |151.0 |
|3.0 |4.00 |62.00 |0.0161 |16129 |0.1270|127.0 |
|3.5 |5.66 |87.68 |0.0114 |11405 |0.1068 |106.8 |
|4.0 |8.00...
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