(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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