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Data Analysis:Data Analy ? * * i c . Figure 2 : Photomicrograph of the mild steel showing the dark grain boundaries. 1 0 0
Data Analysis:Data Analy
Figure: Photomicrograph of the mild steel showing the dark grain boundaries. X
X for camera for the microscope
Draw X frame on the saved image.
Count the number of grains included within the frame, do not include
any uncompleted grains within the frame.
To determine the ASTM grain size number, the number of grains counted in
step should be at a magnification of the number of grains at
magnification can be calculated from:
The specimen grain size number, can be calculated from:
Where : number of grains at per square inch
: ASTM grain size number integer
Determine the average grain size AGS of the specimen by counting the
AGS
Calculate AGS for three different lines and take the average value.
Calculate the average Aspect Ratio AAR of the specimen grains. The aspect
ratio of a grain is the ratio of the minimum dimension of the grain to its maximum
dimension.
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