Engineering Materials
Stress relaxation is the phenomenon

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

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Engineering Materials
Grey cast iron

Is produced by annealing process. I 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 o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable

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