7 (i) An AISI 1076 alloy heated to 1200C in an inert atmosphere such that the...

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7 (i) An AISI 1076 alloy heated to 1200°C in an inert atmosphere such that the composition of the alloy at the center remains unchanged. If the alloy subjected to (a) slow cooling (in air) and (b) rapid cooling (quenching in liquid bath) from 1200°C to 20°C what would the final microstructure and mechanical property at the surface and the center of the alloy? [4] (ii) If the same alloys mentioned in (i)(a) and (i)(b) heated up to (a) 300°C and (b) 700°C, hold it for some time and bring it to room temperature do you expect any changes in the microstructure and mechanical properties of the alloy at the surface and center? [4+4] (iii) The steel alloy mentioned in (ii(b)) is coated with Alminium-Copper alloy (2 wt% Cu and 98 wt% Al) at 600°C. If the coated plate subjected to rapidly cooling in water followed by reheating at 300°C. Do you expect any changes in the mechanical property of the (a) coated material and (b) steel alloy? The eutectic transformation equation of the Al-Cu alloy are as follows: [4] 550°C L(20 wt% of Cu) (iv) What would be the final microstructure and mechanical property of a Fe-C alloy consisting of 3.0 wt% carbon, subjected to (a) slow cooling and (b) rapid cooling from 1500°C to 20°C? Give short justification of your answer. [4] a (5wt% of Cu) + CuAl₂ (35 wt% of Cu) END 7 (i) An AISI 1076 alloy heated to 1200°C in an inert atmosphere such that the composition of the alloy at the center remains unchanged. If the alloy subjected to (a) slow cooling (in air) and (b) rapid cooling (quenching in liquid bath) from 1200°C to 20°C what would the final microstructure and mechanical property at the surface and the center of the alloy? [4] (ii) If the same alloys mentioned in (i)(a) and (i)(b) heated up to (a) 300°C and (b) 700°C, hold it for some time and bring it to room temperature do you expect any changes in the microstructure and mechanical properties of the alloy at the surface and center? [4+4] (iii) The steel alloy mentioned in (ii(b)) is coated with Alminium-Copper alloy (2 wt% Cu and 98 wt% Al) at 600°C. If the coated plate subjected to rapidly cooling in water followed by reheating at 300°C. Do you expect any changes in the mechanical property of the (a) coated material and (b) steel alloy? The eutectic transformation equation of the Al-Cu alloy are as follows: [4] 550°C L(20 wt% of Cu) (iv) What would be the final microstructure and mechanical property of a Fe-C alloy consisting of 3.0 wt% carbon, subjected to (a) slow cooling and (b) rapid cooling from 1500°C to 20°C? Give short justification of your answer. [4] a (5wt% of Cu) + CuAl₂ (35 wt% of Cu) END

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i the surface of alloy after slow cooling will likely to consist to consist a mixture of ferrite and ... View the full answer