(a)
Using the isothermal transformation diagram for a 1.13wt%C steel alloy, specify the nature of the final microstructure,
Rapidly cool to 250°C (480°F), hold for 103 s, then quench to room temperature.
(b)
Using the isothermal transformation diagram for a 1.13wt%C steel alloy, specify the nature of the final microstructure,
Rapidly cool to 775°C (1430°F), hold for 500 s, then quench to room temperature.
(c)
Using the isothermal transformation diagram for a 1.13wt%C steel alloy, specify the nature of the final microstructure,
Rapidly cool to 400°C (750°F), hold for 500 s, then quench to room temperature.
(d)
Using the isothermal transformation diagram for a 1.13wt%C steel alloy, specify the nature of the final microstructure,
Rapidly cool to 700°C (1290°F), hold at this temperature for 105 s, then quench to room temperature.
(e)
Using the isothermal transformation diagram for a 1.13wt%C steel alloy, specify the nature of the final microstructure,
Rapidly cool to 650°C (1200°F), hold at this temperature for 3 s, rapidly cool to 400°C (750°F), hold for 25 s, then quench to room temperature.
(f)
Using the isothermal transformation diagram for a 1.13wt%C steel alloy, specify the nature of the final microstructure,
Rapidly cool to 350°C (660°F), hold for 300 s, then quench to room temperature.
(g)
Using the isothermal transformation diagram for a 1.13wt%C steel alloy, specify the nature of the final microstructure,
Rapidly cool to 675°C (1250°F), hold for 7 s, then quench to room temperature.
(h)
Using the isothermal transformation diagram for a 1.13wt%C steel alloy, specify the nature of the final microstructure,
Rapidly cool to 600°C (1110°F), hold at this temperature for 7 s, rapidly cool to 450°C (840°F), hold at this temperature for 4 s, then quench to room temperature.
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