As the grain size decreases, the ductile to brittle transition temperature _________
1.increases
2. decreases
3.remains the same
4.no defined relationship between them
The Ductile fracture depends strongly on strain rate compared with brittle fracture, which is relatively insensitive to strain rate.
1.True
2. False
The ductile to brittle transition does not depend on the metallurgical feature. It is material-specific property.
1.True
2.False
The grain size has an effect on the ductile or brittle failure of material.
1.True
2.False
The presence of notch in material will _______________ the ductile to brittle transition temperature of the material.
1.increase
2.decrease
3.remain constant
4.not dependent on notch
The presence of second phase particle reduces the ductility of the material. The type of particle which has the least effect in lowering the ductility is __________
1.spherical precipitates
2.platelike precipitates
3.rodlike precipitates
4.acicular precipitates
Which of the following force is responsible for forcing dislocation together during cracking?
1.Tensile force
2.Shear force
3.Bending force
4.Torsional force