Alloying elements play a critical role at achieving special properties and chara

Question

Alloying elements play a critical role at achieving special properties and characteristics in iron. They cause solid-solutian, strengthening, precipitation strengthening and grain refinement 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 designing the heat treatment of iron alloys 7. The following figure is the TTT diagram of abypoeutectic, steel, and the pink line is the cooling history. Please describe the microstructure at each of the six points indicated along the line. (20 points) 900 800. 7003' ·y-Fe+-Fe: O 6002 50 00 Pearlite 500 D 400 Bainite 300 200 100 0 90 .1hou...^ 102 Time (s) 10 103 104 105

Explanation / Answer

1= Austenite

2=Austenite + Less ferrite content

3= Primary ferrite + Gamma ferrite+ Austenite

4= begin to form Pearlite

5= Primary ferrite + Pearlite

6=Pearlite

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