Engineering Materials
Cobalt in steel

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

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Engineering Materials
Stress relaxation is the phenomenon

Stress reduces on increasing load
In which parts are not loaded
In which deformation tends to loosen the joint and produces a stress reduced
In which stress remains constant on increasing load

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Engineering Materials
The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C above upper critical temperature
30° C to 50° C below upper critical temperature
30° C to 50° C above lower critical temperature
30° C to 50° C below lower critical temperature

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