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SOL QUIZ 4 REC5%266

# SOL QUIZ 4 REC5%266 - NAME MSE 230-REC5&6 QUIZ#3(30 pts...

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γ +L α + γ γ + Fe 3 C L+ Fe 3 C γ +L NAME: MSE 230-REC5&6 QUIZ #3 (30 pts): Fe-C diagram (0 < wt % C< 6.70) L(Liquid ) δ γ (Austenite) L+ Fe 3 C γ + Fe 3 C α +γ α α + Fe 3 C Fe 3 C(Cementite) 1. Fill in the phase diagram with the following phases and combination of phases. α ( Ferrite) δ γ (Austenite) L(Liquid ) Fe 3 C(Cementite) α + Fe 3 C 2. At which temperature does the eutectic reaction occur? 1147°C Write down the eutectic reaction. Include phase compositions. 4.3 wt % 2.14 wt % 3 L Fe C γ = + 3. At which temperature does the eutectoid reaction occur? 727°C Write down the eutectoid reaction. Include phase compositions. 0.76 wt % 0.022 wt % 3 Fe C γ α = +

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(a) (b) 4. An Iron-Carbon alloy with 0.5 wt% C is cooled down from 1200
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