Aluminium-killed steels contain aluminium nitride precipitates which stabilize the austenite grain size during heating.

Aluminium-killed steels contain aluminium nitride precipitates which

1.	Aluminium-killed steels contain aluminium nitride precipitates which stabilize the austenite grain size during heating.
A.	False
B.	True
Answer» C.

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Assume the volume fraction 0.4 of particles all with a radius 3mm, the grain boundary energy is given as 6kJ/mm. Calculate the restraining force per unit area of boundary? (Approximately)
Aluminium-killed steels contain aluminium nitride precipitates which stabilize the austenite grain size during heating.
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Aluminium-killed steels contain aluminium nitride precipitates which stabilize the austenite grain size during heating.

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