- The four single phases presents in the iron-carbide diagram with their phase diagram notation and the assigned name.

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Chapter 4, Problem 29RQ

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To discuss:- The four single phases presents in the iron-carbide diagram with their phase diagram notation and the assigned name.

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Draw Iron - Iron Carbide Phase diagram and show the following: 1- Temperature, phases and carbon weight for Eutectic. 2- Temperature, phases and carbon weight for Eutectoid Thecementite, 3- austenite, ferrite, delta phases with their 4- Types of ferrous alloys on different carbon rates. 5- Draw the phase at T= 700 CD and 0.7 wt% C what is its name ? temperatures and carbon weight.

4b) Figure 6 shows the Fe-Fe3C phase diagram. Evaluate (i) the temperature at which austenite first begins to transform on cooling; (ii) the primary microconstituent that forms; (iii) the composition and amount of each phase present at 728°C; (iv) the composition and amount of each phase present at 726°C; (v) Sketch the evolution of the microstructures of hypereutectoid steels with 1.1 wt% of carbon during the cooling in relationship to Fe-Fe3C phase diagram shown at 900°C, 800°C and 500°C, respectively.

A hypo-eutectoid steel with composition of 0.5% carbon is heated to 1000°. Using the a iron-carbon phase diagram (also found in the course book, or here https://commons.wikimedia.org/wiki/File:Iron_carbon_phase_diagram.svg (Links to an external site.) (Links to an external site.)) answer the following questions. (a) What phase or phases will be present at 950°C? (b) If temperature is lowered from 950°C, at which temperature (estimate) α phase (Ferrite) will appear? (c) Use the lever rule to estimate how much (wt%) ferrite and how much austenite will exist just above 727 °C? (d) What happens to the austenite if the temperature is lowered below 727 °C? (e) Schematically sketch and label the resulting microstructure.