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  3. 2 read about the ttt diagram for steel and describe...

Question: 2 read about the ttt diagram for steel and describe...

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2. Read about the T-T-T diagram for steel and describe what type of microstructure will form for cooling paths 3 and 4 shown on Figure 1 and include diagram in your report. (2)

800 Austenite 1400 700 1200 600 Pearlite 1000 500 Bainite Type: 1080 g Composition: Fe-0.79% C-0.76% Mn Grain size: 6 Austenitized at 899 °C(1650 F 800 400 300600 50% 200 400 0 Martensite I-T diagram 100200 2 Estimated temperature 3 min 1 day 1 wee 0.5 1 2 5 10 102 104 105 106 Time, s Figure 1: Isothermal Transformation (I-T or T-T-T) showing various idealized cooling paths: Path 1: 100% Martensite is formed. Path 2: 50% Perlite and 50% Martensite is formed. Path 5: 100% Pearlite is formed.

4340H: End-Quench Hardenability Distance from Distance from Hardnes max 勾 Figure 2: 4340 Hardenability Curves and Table

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