Sources of Inclusions Formation
Non-metallic inclusions arise because of many physical-chemical effects that occur in molten and consolidated metal during production.
Non-metallic inclusions that arise because of different reactions during metal production are called natural or indigenous. They include oxides, sulfides, nitrides and phosphides.
Apart from natural inclusions there are also parts of slag, refractories, material of a casting mould (the material the metal contacts during production) in the metal. Such non-metallic inclusions are called foreign, accidental or exogenous.
Most inclusions in the reduction smelting of metal formed because of admixture dissolubility decreasing during cooling and consolidation.
The present-day level of steel production technology allows the elimination of most natural and foreign inclusions from the metal. However its general content in different steels can vary between wide limits and has a big influence on the metal properties.
Read more about this topic: Non-metallic Inclusions
Famous quotes containing the words sources of, sources and/or formation:
“The sources of poetry are in the spirit seeking completeness.”
—Muriel Rukeyser (1913–1980)
“No drug, not even alcohol, causes the fundamental ills of society. If we’re looking for the sources of our troubles, we shouldn’t test people for drugs, we should test them for stupidity, ignorance, greed and love of power.”
—P.J. (Patrick Jake)
“It is because the body is a machine that education is possible. Education is the formation of habits, a superinducing of an artificial organisation upon the natural organisation of the body.”
—Thomas Henry Huxley (1825–1895)