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Unformatted text preview: 6. Describe the difference between age hardening in nonferrous metals and martensite tempering in steels. 7. Identify the important reasons why metals are annealed. 8. Define precipitation hardening ? 9. Explain the difference between hardness and hardenability. 10. Describe the phases resulting from cooling along A, B, C, D lines in the CCT diagram of steel. Calculation: 1. For an alloy containing 50% Cu and 50% Ni, calculate the amounts of solid S and liquid L presents at 1300C. Show that the total nickel content in the solid and liquid phases adds up to 50%. (5’) 2. Calculate the relative proportions of phases in Cu-Ag alloy of eutectic composition, just below the eutectic temperature. During the cooling of an Alloy (Cu 80% Ag 20%) from 1100C to 600C, describe each phase transitions, the temperature for starting each phase transformation. (6’)...
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- Spring '08
- Stoichiometric intermetallic compound, temperature-composition phase diagram, elevated temperature phase