Homework 10-solutions

Homework 10-solutions - MAT 33 Fall 2008 Due Do not hand-in...

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MAT 33 – Fall 2008 Homework #10 Due: Do not hand-in for grading 1. A die-casting alloy of 95 wt % Al - 5 wt % Si (see diagram below) is cooled so that the metal contains primary ( i.e., proeutectic) α and an eutectic mixture of α and β . What fraction of the casting is primary α ? Draw a tie line just above the eutectic tie line. Then,    12.6 - 5 12.6 - 1.65 = 0.694 = W primary α 2. An eutectoid steel is heated to 800 ° C and cooled slowly through the eutectoid temperature. Calculate the number of grams of carbide formed per 100 g of steel.    0.76 - 0.022 6.7 - 0.022 = 0.11 11 g of carbide
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3. Suppose that a steel with an alloy composition of 0.6 wt % C is slowly cooled from 800 ° C to a temperature just below the eutectoid temperature. a.) Is this a hypoeutectoid, eutectoid or hypereutectoid steel? b.) What primary phase is formed during this process? c.) What is the composition of the first solid phase to form in the γ phase? d.)
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Homework 10-solutions - MAT 33 Fall 2008 Due Do not hand-in...

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