Chapter 10 : Heat Treatment

Example 10.1 Page No : 343

In [1]:
			
import math 

# Variables
N = 8;			#ASTM grain size number
n = 2**(N-1);			#Number of grains per inch square at a magnification
N_1 = n*100.*100;			#Number of grains per inch square without magnification

# Calculation
N_2 = N_1/(25.4)**2;			#Number of grains per mm square without magnification
A_a = 1./(N_2);			#Average area of each grain(in mm**2)
D = (A_a)**(1./2);			#Average grain diameter(in mm)

# Results
print 'Average grain diameter = %.3f mm'%D
Average grain diameter = 0.022 mm