Below is a continuous cooling transformation curve for steel (upper) and for a silicate melt (lower). Describe the similarities and differences as follows. a. What is the critical cooling rate in each case? b. What phase(s) form in each case when the critical cooling rate is exceeded? c. What phase(s) form in each case if the cooling rate is very slow? 800 1400 Ae lemperature Austenite *peorlite begins 10FI 700 1200 Austenitepearlite complete 1600 1000 5009 800 Tronsformation stops 400 600 300 400 Austenite -mortenstic structure 200 -Isathermal dogram Continuous transformaton diogrom Constant rate coding curves - 100 200 Findl structure Mortensite Morlensite i peorlile Peorite (softer, coorser- 0.1 10? 10 Tronsformation time, seconds Continuous Cooling-Transformation (C-T)Diagram (Derived from the isothermal-transformation diagram for a plain-carbon eutectoid steel) 1200 Glass Crystallization begins 1100 1000 Critical cooling rate Glass-ceramic 900 Crystallization ends 800 700 102 10 10 10 1010 1012 104 Time (s) (logarithmic scale) Temperature, "F 250FIS Temperature (°C) O 100°C/min Temperature, "C

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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Below is a continuous cooling transformation curve for steel (upper) and for a silicate melt (lower).
Describe the similarities and differences as follows.
a. What is the critical cooling rate in each case?
b. What phase(s) form in each case when the critical cooling rate is exceeded?
c. What phase(s) form in each case if the cooling rate is very slow?
800
1400
Ae lemperature
Austenite
*peorlite begins
10FI
700
1200
Austenitepearlite complete 1600
1000
5009
800
Tronsformation stops
400
600
300
400
Austenite -mortenstic structure
200
-Isathermal dogram
Continuous transformaton
diogrom
Constant rate coding curves - 100
200
Findl structure
Mortensite Morlensite
i peorlile
Peorite (softer, coorser-
0.1
10?
10
Tronsformation time, seconds
Continuous Cooling-Transformation (C-T)Diagram
(Derived from the isothermal-transformation diagram for a plain-carbon eutectoid steel)
1200
Glass
Crystallization
begins
1100
1000
Critical
cooling
rate
Glass-ceramic
900
Crystallization
ends
800
700
102
10
10
10
1010 1012
104
Time (s)
(logarithmic scale)
Temperature, "F
250FIS
Temperature (°C)
O 100°C/min
Temperature, "C
Transcribed Image Text:Below is a continuous cooling transformation curve for steel (upper) and for a silicate melt (lower). Describe the similarities and differences as follows. a. What is the critical cooling rate in each case? b. What phase(s) form in each case when the critical cooling rate is exceeded? c. What phase(s) form in each case if the cooling rate is very slow? 800 1400 Ae lemperature Austenite *peorlite begins 10FI 700 1200 Austenitepearlite complete 1600 1000 5009 800 Tronsformation stops 400 600 300 400 Austenite -mortenstic structure 200 -Isathermal dogram Continuous transformaton diogrom Constant rate coding curves - 100 200 Findl structure Mortensite Morlensite i peorlile Peorite (softer, coorser- 0.1 10? 10 Tronsformation time, seconds Continuous Cooling-Transformation (C-T)Diagram (Derived from the isothermal-transformation diagram for a plain-carbon eutectoid steel) 1200 Glass Crystallization begins 1100 1000 Critical cooling rate Glass-ceramic 900 Crystallization ends 800 700 102 10 10 10 1010 1012 104 Time (s) (logarithmic scale) Temperature, "F 250FIS Temperature (°C) O 100°C/min Temperature, "C
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