Question: Q5. (12 marks total) TTT diagram and microstructure evolution. Consider 1 kg of 0.5 wt. % steel (hypoeutectoid steel). Given the TTT diagram, answer the

Q5. (12 marks total) TTT diagram and microstructure evolution. Consider 1 kg of 0.5 wt. % steel (hypoeutectoid steel). Given the TTT diagram, answer the following heat treatment related questions.. a) Identify the microstructure, if the temperature is dropped from 800 C to 750 C in 0.5 second and held for 1 hours. Sketch the heat treatment history on the TTT diagram. (4 mark) b) Calculate the microstructure (i.e., quantify the fraction of each phase and its morphology), if the steel is instantly quenched from 800 C to 500 C and held at 500 C for 3 seconds and then instantly quenched to 380 C. Sketch the heat treatment history on the TTT diagram. (4 mark) ) Estimate the quench rate needed to avoid formation of proeutectoid . (4 mark) O(' 900 800 700 i { 1 Coarse pearlite + a i 1 ; 1 500 Fine pearlite i 3 400 - ! Bainite i 1 f I 300 : 1 i 200 | 1 5 100 i i ' 0 i 0.1 1 10 10? 10 104 10 0.5 Time, seconds wt % C Copyright 2015 Pearson Education, All Rights Reserved

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