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# quiz10 - r although we did not evaluate what that might be...

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Question 1 1 out of 2 points For the given hypereutectoid composition of steel (C 0 = 1.13 wt% C), which of the cooling schemes would lead to a microstructure containing only bainite and martensite (with some retained austenite). The letter C in the diagram is for proeutectoid cementite. Note, unlike your book, I use only a vertical line to depict cooling suddenly to room temperature.

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Answer Selected Answer: 3 Correct Answer: none would Response Feedback: Question 2 2 out of 2 points In class we saw that for homogeneous nucleation there is a critical radius,
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Unformatted text preview: r*, although we did not evaluate what that might be. Using the equation for ΔG (the free energy) given in your notes, derive the correct relationship for r* in terms of ΔG v (the volume free energy) and γ (the surface energy). Hint: this requires taking a derivative. Answer Selected Answer: r* = -2γ / ΔG Correct Answer: r* = -2γ / ΔG Response Feedback: Correct Take derivative with respect to respect to r, set equal to zero, and sove for r. Your basically finding where the slope equals zero on the ΔG vs r curve....
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quiz10 - r although we did not evaluate what that might be...

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