Iron and steel are among the most widely-used engineering materials.It is our com-mon knowledge that iron and steel have magnetism and their magnetization varies significant-ly.Steel is mainly an alloy of iron and carbon,which may contain small amounts of other allo-ying elements.This paper gives a brief introduction and performs some preliminary discus-sions on the magnetism of iron-carbon alloys with different carbon content or metallographic structures,mainly based on the iron-carbon binary phase diagram.There are three ferromag-netic components in steel:ferrite,cementite and martensite.The latter is a metastable phase which does not appear in the phase diagram.This paper can serve as a teaching case for learn-ing and application of the phase diagram.
magnetismphase diagramiron and steeliron-carbon alloys
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