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11 Dec 2019

Determine the ASTM grain size number for the materials in Figure 4-14 and 4-20. You will need the book for this problem.

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c) An ASTM grain size determination is being made from a microgra phs at a magnification of 200X.. What is the ASTM grain size number of a metal if there are 64 grains per square inch on the micrograph?? (11 point))

BCC Specimen

Material: transformer iron

Calculate grain size by intercept method using the data below

(Me) eye piece magnification: 10

(Mo) objective magnification: 50

Scan # # of grains apparent length of scan

1 3 1cm

2 3 1cm

3 4 1cm

4 4 1cm

5 5 1cm

___________________________________________________________

Total: G= 19 L=5cm(Me)= _____________

Â· Actual grain intercept distance= (L)/(G*(Me)*(Mo)) = ______________________

Â· Grain size(from ASTM standard E112) =_____________________________

Â· Assuming equiaxed grains calculate the number of grains in 1m^3 of this sample (note:P(iron)=7.88 g/(cm^3) â this information may be useful)

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Determine the ASTM grain size number for the materials in Figure 4-14 and 4-20. You will need the book for this problem.

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