What is ferrite? (5 points) 2. 3. 4. What is cementite? (5 points) s pearlite? How to form pearlite? (5 points) What What is bainite? How to form bainite? (5 points) 6. What is martensite? How to form martensite? (5 points) Alloying elements playa critical role at achieving specal properties and characteristics in ron strengthening. precipitation strengthening and element of iron, and it exists primanily as a form of carbide after reaating with iron or ather alloying eherments treatment of iron aloys is to adjust the distribution or C and carbi a partioles. This is the heat treatment of iron alloys They nse solie-solution atso the key to undestarding and designing cooling history Please favorable functions, C teprmoipal alloying The thome of the hea s grain refinement as well as other 7. The following figure is the TTT diagram of a hypeeutectic steel, and the pink line is the describe the microstructure at each of the six Arts indicated alog te ine(20 points) 800 700 500 2 500 r-Fera-Fe so (100 100 1 min 1 hour 1 day 0.1 10 10 1010 10 Time (s)