Question

1.Give examples of ionic, covalent and metallic bonds. Relate the bond type to regions of the...

1.Give examples of ionic, covalent and metallic bonds. Relate the bond type to regions of the periodic table. Describe some secondary bond types.

2. Draw the iron carbon phase diagram. Label all the phase regions. Indicate a eutectic reaction, a eutectoid reaction and a peritectic reaction. Indicate the structure of a steel containing 0.4%C at 950C, when cooled slowly to 800C, and finally cooled to 600C. Is this steel a hypo or hyper euectoid?

3. Draw a phase diagram from the following information. Melting point of A is 300C, melting point of B is 450C. Eutectic composition is 55%A, 45%B with a eutectic temperature of 125C. Maximum solid solubility of B in A is 20%, maximum solubility of A in B is 10%, both at the eutectic temperature. At room temperature the solubility of B in A is 10%, and for A in B is 5%.

Calculate the amount of pro eutectic alpha and eutectic for a 30%B in A alloy.

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