Engineering Materials
Stress relaxation is the phenomenon

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

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Engineering Materials
Ductile cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Is produced by annealing process. It is soft, tough and easily machined metal
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
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

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