Engineering Materials
The presence of hydrogen in steel causes

Improved Weldability
Embrittlement
Corrosion resistance
Reduced neutron absorption cross-section

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Engineering Materials
Grey cast iron

Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable
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

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Engineering Materials
Amorphous material is one

Which is not attacked by phosphorous
In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
In which atoms align themselves in a geometric pattern upon solidification
Which emits fumes on melting

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