Engineering Materials
Stress relaxation is the phenomenon

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
Stress reduces on increasing load

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Engineering Materials
Ductile cast iron

Is produced by annealing process. It is soft, tough and easily machined metal
Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

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