d) Figure 3 shows the microstructure of plain carbon steel containing 0.4 wt.% C that has gone through isothermal harden

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D Figure 3 Shows The Microstructure Of Plain Carbon Steel Containing 0 4 Wt C That Has Gone Through Isothermal Harden 1 (459.72 KiB) Viewed 13 times

d) Figure 3 shows the microstructure of plain carbon steel containing 0.4 wt.% C that has gone through isothermal hardening. The microstructure contains only proeutectoid ferrite and martensite phases. Using the TTT diagram provided in figure 4, explain the isothermal hardening cycle that will yield this microstructure. In terms of mechanical behaviour, explain the similarities/differences between the microstructure in figure 3 and the hardened steel in part (c). OUTN Ferrite OUT EXAMINATION Martensite Figure 3 UTM PIRAL J OUTH UTM (10 marks) OUTN