（）is one of the principal alloying elements in stainless steels, and one major constituent in superalloys.

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• （）alloys, in which, iron is the principal constituent, include steels and cast irons.
• Stainless steels are divided into three classes on the basis of the predominant phase constituent of the microstructure:（）,（）, o
• Amorphous solids have onlyorder in the arrangement of constituent particles