Question

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Alloying elements play a critical role at achieving special properties and characteristics in iron. They cause solid-solution Strengthening, precipitation strengthening and rain rafinament as well as other favorable functions. C is the principal alloying element of iron, and it exists primarily as a form of carbide after reacting with iron or other alloying elements. The theme of the heat treatment of iron alloys is to adjust the distribution of C and carbide particles. This is also the key to understanding and designs the heat treatment of iron alloys. 11. ine following figure is the TTT diagram of a hypoeutectic steel, and the pink line is the cooling history. Fid describe the microstructure at each of the six points indicated along the line. (15 points) 900 Y-Feta-Fe 50100 Pearlite Temperature ("C) Bainite 1 min 1 hour 1 day 0 0. 1 1 10 103 104 105 10² Time (s)

Answer 1

Answer! - Given that cruation is.. The given elements to play a cinctical role at the acheving the specical properties is Asstenite - Asstentie is the interestitical solid solution of inestime is r- iron which is a pure from 0+ union having average number of atoms = 45 passes non- magnetic properties. It is a methalic all drop of with as allaying element. it is fee structure. - Austenzing - It is a heat of treatment process in which steel is heates above the orictical tem -Perature through for transtaction it's occurs it is neters to heating into the internate phase. The during which the allatentic structure is formed

=) fersite: It is a intertical solid of inf- iron which is a pare form of average noot atom=2 & passes. forsite to iron having mon-magnetic properties. the oft is a pare steel with less Percentage of carton. Co.008% at room) .. Hence the given problem is soled