(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. 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.

Given the TTT diagram for iron-carbon alloy

(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), hold for 100 s, then quench to room temperature. (vi) Rapidly cool to 250°C (480°F), hold for 100 s, then quench to room temperature in water. Reheat to 315°C (600°F) for 1 h and slowly cool 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), hold for 100 s, then quench to room temperature. (vi) Rapidly cool to 250°C (480°F), hold for 100 s, then quench to room temperature in water. Reheat to 315°C (600°F) for 1 h and slowly cool to room temperature.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Thermodynamic Relations

Thermodynamics is the division of physics that deals with the transfer of any kind of energy, whether it be heat, temperature, or work, from one object to another.

Question

(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), hold
for 100 s, then quench to room temperature.
(vi) Rapidly cool to 250°C (480°F), hold for 100 s, then quench to room temperature in
water. Reheat to 315°C (600°F) for 1 h and slowly cool to room temperature.

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