(0) (ii) Explain how an understanding of the creep failure mechanisms of high temperature nickel alloys has led to alloy and manufacturing developments which have resulted in an increase in the maximum operating temperature of a jet engine turbine blade. If we quench a plain carbon steel we can produce a very strong/hard and yet brittle material. Why does the quench lead to this change in properties, and what subsequent heat treatment would enable us to mostly retain the high strength whilst improving the ductility? Explain the effects of your proposed heat treatments in terms of the phase

Look up the standard aluminum alloy heat treatment temper designations. Use the designations to justify the yield strength behavior of the following aluminum alloys listed in Table 1.2: 2024-T3 vs. 2024-T6 and 7075-T6 vs. 7075-T73.

Austentitic stainless steel's are not hardenable by cold working however Austentic stainless steel's can be strengthened by heat treatment true or false?

QUESTION 4 A method of determining the result of heat treatment as well as the state of a metal prior to heat treatment TTTArial 3 (12pt) Path: p !!!

Nickel-based alloys are used for gas turbine blades in aerospace engines. Briefly discuss the characteristics that make these alloys the choice for this application. Single-crystal technology is applied to nickel alloys that are used as gas turbine blades in aerospace engines. With the aid of sketches describe how a single-crystal casting can be manufactured and explain why a single-crystal casting is likely to have superior creep resistance than a directly-solidified one. Demonstrate the application of the Ten-percent Rule by calculating the approximate tensile strength and elastic modulus in the 0° direction of a carbon-fibre reinforced polymer composite if the strength and elastic moduluş in the 0° single ply are 3620 MPa and 143 GPa respectively. The lay-up sequence of the composite is [02/+45/-45/902]s.

a) Explain why work hardenable aluminium alloys cannot be age-hardened because the precipitation hardening reaction does not occur. To maintain strength, what might be another reason why aluminium alloys can't be work hardened? (Think about dislocations.)

What does the process of temper drying do for hardened carbon steel?

Can copper alloy  be hardened through heat treatment? justify. If not, suggest suitable processes for hardening the copper alloy.