Question

2. Draw schematic diagrams to show how growth rate and nucleation rate should vary with temperature for diffusional transformations that are induced by an increase in temperature. 3. Explain the microstructure evolution in path 2 and 3 in the following TTT diagram 900 Austenite 800 700 600 500 400 300 200 100 .5 1 1 2 3 Ms M50 M90 Bainite transformation ends 3 Highest temperature at which ferrite can form 1100 Eutectoid temperature 1000 Pearlite transformation 900 starts Pearlite transformation ends 800 700 600 500 400 2 1 Bainite 3 2 Ferrite and 1 Ferrite and pearlite martensite 10 100 10^3 10^4 10^5 10^6 Time, in seconds Temperature, °C Temperature, K FIG. 18.39 Arbitrary time-temperature paths on the isothermal diagram of a hypoeutectoid steel

          2. Draw schematic diagrams to show how growth rate and nucleation rate should vary with
temperature for diffusional transformations that are induced by an increase in temperature.
3. Explain the microstructure evolution in path 2 and 3 in the following TTT diagram
900
Austenite
800
700
600
500
400
300
200
100
.5 1
1
2
3
Ms
M50
M90
Bainite
transformation
ends
3
Highest temperature at
which ferrite can form
1100
Eutectoid temperature
1000
Pearlite
transformation
900
starts
Pearlite
transformation
ends
800
700
600
500
400
2
1
Bainite 3
2 Ferrite and 1 Ferrite and
pearlite
martensite
10
100
10^3
10^4
10^5
10^6
Time, in seconds
Temperature, °C
Temperature, K
FIG. 18.39 Arbitrary time-temperature paths on the isothermal
diagram of a hypoeutectoid steel

2. Draw schematic diagrams to show how growth rate and nucleation rate should vary with
temperature for diffusional transformations that are induced by an increase in temperature.
3. Explain the microstructure evolution in path 2 and 3 in the following TTT diagram
900
Austenite
800
700
600
500
400
300
200
100
.5 1
1
2
3
Ms
M50
M90
Bainite
transformation
ends
3
Highest temperature at
which ferrite can form
1100
Eutectoid temperature
1000
Pearlite
transformation
900
starts
Pearlite
transformation
ends
800
700
600
500
400
2
1
Bainite 3
2 Ferrite and 1 Ferrite and
pearlite
martensite
10
100
10^3
10^4
10^5
10^6
Time, in seconds
Temperature, °C
Temperature, K
FIG. 18.39 Arbitrary time-temperature paths on the isothermal
diagram of a hypoeutectoid steel

Added by Ramon P.

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