Engineering Materials
Cobalt in steel

Improves cutting ability and reduce hardenability
Improves wear resistance, cutting ability and toughness
Gives ductility, toughness, tensile strength and anti corrosion property
Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
Points of arrest for iron correspond to

Stages at which further heating does not increase temperature for some time
Stages at which allotropic forms change
There is nothing like points of arrest
Stages at which properties do not change with increase in temperature

ANSWER DOWNLOAD EXAMIANS APP