Question 4: Using the following TTT diagram for an iron-carbon alloy of eutectoid composition,specify the nature of the final microstructure (in terms of microconstituents present andapproximate percentages of each) of a small specimen that has been subjected to the followingtime-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F)and that it has been held at this temperature long enough to have achieved a complete andhomogeneous austenitic structure.(1) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature(ii) Reheat the specimen in part (1) to 700°C (1290°F) for 20 h.(iii) Cool rapidly to 400°C (750°F), hold for 20 s, then quench to room temperature(iv) Cool rapidly to 400°C (750°F), hold for 200 s, then quench to room temperature.(v) Rapidly cool to 575°C (1065°F), hold for 20 s, rapidly cool to 350°C (660°F), holdfor 100 s, then quench to room temperature.(vi) Rapidly cool to 250°C (480°F), hold for 100 s, then quench to room temperature inwater. Reheat to 315°C (600°F) for 1 h and slowly cool to room temperature.Temperature (°C)800700600500400300200100010-1AM (start)M (50%)M (90%)110Eutectoid temperatureM + A10²Time (s)50%10⁰10⁰T140012001000800600400200105Temperature (°F)

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Question 4: Using the following TTT diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (1) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature (ii) Reheat the specimen in part (i) to 700°C (1290°F) for 20 h. (1) Cool rapidly to 400°C (750°F), hold for 20 s, then quench to room temperature

Question 4: Using the following TTT diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (1) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature (ii) Reheat the specimen in part (i) to 700°C (1290°F) for 20 h. (1) Cool rapidly to 400°C (750°F), hold for 20 s, then quench to room temperature

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Strengthening of Alloys

Strengthening of the alloys is required as metals become weak due to various lattice defects, metal bonding phenomena. The strength of the metals is not enough for any mechanical work. The internal dislocations of any metals arise due to forming processes. Due to the movement of these dislocations, the metals are plastically deformed.

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