HW 8 - 9000 and a density of 4.26 g/cm 3 , determine the...

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HW 8 (Due 3/10 Mon) 12-8 Suppose that age hardening is possible in the Al-Mg system. (See Figure 12-8.) (a) Recommend an artificial age-hardening heat treatment for each of the following alloys, and (b) Compare the amount of the β precipitate that forms from your treatment of each alloy. (i)Al-4% Mg (ii) Al-6% Mg (iii) Al-12% Mg (c) Testing of the alloys after the heat treatment reveals that little strengthening occurs as a result of the heat treatment. Which of the requirements for age hardening is likely not satisfied ? 12-9 An Al-2.5% Cu alloy is solution-treated, quenched, and overaged at 230°C to produce a stable microstructure. If the θ precipitates as spheres with a diameter of
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Unformatted text preview: 9000 and a density of 4.26 g/cm 3 , determine the number of precipitate particles per cm 3 . 12-31 A steel contains 94% pearlite and 6% primary cementite at room temperature. Estimate the carbon content of the steel. Is the steel hypoeutectoid or hypereutectoid? 12-56 A steel containing 0.95% C is heated to various temperatures above the eutectoid temperature, held for 1 h, and then quenched to room temperature. Using Figure 12-28 determine the amount and composition of any martensite that forms when the heating temperature is (a)728C (b)750C (c)780C (d) 850C...
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HW 8 - 9000 and a density of 4.26 g/cm 3 , determine the...

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