Determine the resulting microstructure for 0.8% carbon steel if the steel cooled from the y region to 280°C within 5 seconds. If the resulting microstructure in Question 6b (i) above is reheat to 300°C minute and hold for 1 hour at remain temperature, then and then rapidly to room temperature, determine its final microstructure.

Determine the resulting microstructure for 0.8% carbon steel if the steel cooled from the y region to 280°C within 5 seconds. If the resulting microstructure in Question 6b (i) above is reheat to 300°C minute and hold for 1 hour at remain temperature, then and then rapidly to room temperature, determine its final microstructure.

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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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

°C
800
"27ר
700
Coarse pearlite
600
a+ Fe,C
Fine pearlite
00
+a+ Fe, C
400
Bainite
300
Ms
200
Mso
100
I sec
I min
hour
I day
of
0.1
10
102
10
104
105
Time, seconds
APPENDIX A

Refer to the Time Temperature Transformation (TTT) diagram given in Appendix A:
(i) Determine the resulting microstructure for 0.8% carbon steel if the steel is rapidly
cooled from the y region to 280°C within 5 seconds.
(i) If the resulting microstructure in Question 6b (i) above is reheat to 300°C within 1
minute and hold for 1 hour at remain temperature, then and then rapidly quenched
to room temperature, determine its final microstructure.
(ii) If the resulting microstructure in Question 6b (i) above is reheat to 300°C within 1
minute and hold for 16 minutes at remain temperature, then and then rapidly
quenched to room temperature, determine its final microstructure.
(iv) Arrange the mircostructures 6 (b) (i,i and i) from the lowest to the highest
hardnes value.
(v) Sketch the thermal history from Question 6b (i) to (ii) on a TTT diagram.

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