ASTM Grain Size Number
Dimensions of the grains or crystals in a polycrystalline metal exclusive of twinned regions and subgrains when present. Grain size is usually estimated or measured on the cross section of an aggregate of grains. The common units of grain size are:
- Average diameter
- Average Area
- Number of grains per linear unit
- Number of grains per unit area
- Number of grains per unit volume
Grains size number
A grain size designation bearing a relationship to average intercept distance at 100 diameters magnification according to the equation
G = 10.0 - 2 Log2 L
where L = average intercept distance in millimeters at 100 times magnification
To obtain the grain size measurement in the Microstructure Characterizer Software:
- Open the image and solarize it to isolate grain boundaries from the matrix.
- Press of a button will produce the Result in the form of a chart.
Following snap shots describes an easy to operate procedure and its outcome to find grain size and distribution. Multiple images may also be compared for comparison amongst distribution.
For example a replica microstructure taken on boiler Final Super Heater Header, ten years back may be compared with current time and difference in distribution pattern of number of grains v/s grain size shall speak for degradation. No need to prove about theories - the greatest job ever a metallurgist can perform to convince the management.
Find out more about our
Microstructure Characterizer Software designed for today's leading Metallurgists and Material Science Engineers.
