Engineering Materials
The presence of hydrogen in steel causes

Reduced neutron absorption cross-section
Embrittlement
Improved Weldability
Corrosion resistance

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Engineering Materials
Malleable cast iron

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

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Engineering Materials
Stress relaxation is the phenomenon

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

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Engineering Materials
Aluminium bronze contains

10% aluminium and 90% copper
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% magnesium and 9% aluminium with some copper
92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

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