190> 3.How to study this course (1)Key points One Clue:relationship between material's component-structure-property Two figures:Fe-Fe;C diagram,TTT curve Three kinds of material:carbon steel,alloy steel, cast iron Four main heat treatments:annealing, normalizing,quenching,tempering(1) Key points One Clue: relationship between material’s component –structure-property Two figures: Fe-Fe3C diagram, TTT curve Three kinds of material: carbon steel, alloy steel, cast iron Four main heat treatments: annealing, normalizing, quenching, tempering 3. How to study this course