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  Effect of grain size     1 of 5

The effect of grain size on yield strength, sy, is given by the Hall Petch equation for structural steels:


where so is the lattice resistance, i.e. friction stress which opposes dislocation motion
k is a constant, sometimes called the dislocation locking term
d is the ferrite grain size


What grain size is required to give a yield strength of 225 MPa in a ferritic steel?

7 m 14 m 7 mm-1/2 14 mm-1/2


To control the ferrite grain size two different approaches can be used (separately or in combination)

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