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

Aluminium-killed steels contain aluminium nitride precipitates which s

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

Discussion

No Comment Found

Related MCQs

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.
Stabilization of a fine grain size during heating at high temperatures requires__________
Calculate the maximum grain size D max possible, if the radius of the spherical particle is 5mm and the volume fraction is given as 0.2?
If there is a volume fraction f of particles all with a radius r the mean number of particles intersecting unit area of a random plane is_________
The nature of normal grain growth in the presence of a second phase deserves special consideration. The moving boundaries will be attached to the particles exert a pulling force on the boundary restricting its motion. Therefore if the boundary intersects the particle surface at 90 the particle will feel a pull of (2 r cos )*sin . This will be counterbalanced by an equal and opposite force acting on the boundary. As the boundary moves over the particle surface changes and the drag reaches a maximum value, this happens when becomes______
There can be this growth of just a few grains to very large diameters. Such situation is known as_____
Experimentally for finding the grain size we use the equation, D = Kt . Here K is the temperature dependent proportionality constant and n is a number less than 0.5 and this n can be taken as 0.5 under which circumstances?
Surface grooving where grain boundaries intersect free surfaces leads to_______
Coarsening is a process that can be considered quite identical to grain growth.

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

Discussion

No Comment Found

Related MCQs

Reply to Comment