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  3. you are given a steel with carbon content of 120...

Question: you are given a steel with carbon content of 120...

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You are given a steel with carbon content of 1.20 wt%. Please answer the following questions:

Soalan 1 Question 1 Composition (at% C) 10 0 15 20 25 1600 1538° 493°C 1400 2500 1394°C 1200 1147°C 2.14 4.30 y, Austenite 2000 1000 912°C Y+ Fe3C 800 a 1500 727°C 0.76 0.022 600 a, Ferrite α+Fe3C Cementite (FegC) 1000 0 (Fe) 2 3 6.70 Composition (wt% C) Rajah S1 untuk soalan 1 Figure Q1 for question 1

a) Make schematic sketches of the microstructure that would be observed for conditions of very slow cooling from 1100 °C at the following temperatures: 1000°C, 800°C, 740°C and 700°C. Label the phases and indicate their compositions (approximate). (6 markah/marks) b) Please determine the followings for this steel at temperature just below 727°C. What is the proeutectoid phase in this steel? (1 markah/marks) How many fractions each of total ferrite and cementite form? (4 markah/marks) How many fractions each of pearlite and the proeutectoid phase form? (4 markah/marks)

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