Give the approximate temperature at which it is desirable to heat each of the following iron-carbon alloys during a full anneal heat treatment: (a) \(0.20 \mathrm{wt} \% \mathrm{C}\), (b) \(0.60 \mathrm{wt} \% \mathrm{C}\) (c) \(0.76 \mathrm{wt} \% \mathrm{C}\), and (d) 0.95 wt \(\%\) C.

Short Answer

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Question: Determine the approximate temperature at which it is desirable to heat different iron-carbon alloys during a full anneal heat treatment for the following alloys: (a) 0.25 wt% C, (b) 0.45 wt% C, (c) 0.85 wt% C, and (d) 1.10 wt% C. Answer: Using the Iron-Carbon Phase Diagram, the approximate temperatures for full anneal heat treatments are: (a) 0.25 wt% C: 750°C, (b) 0.45 wt% C: 725°C, (c) 0.85 wt% C: 700°C, and (d) 1.10 wt% C: 680°C.

Step by step solution

01

(a) \(0.25 \mathrm{wt} \% \mathrm{C}\) Alloy

For the alloy with \(0.25 \mathrm{wt} \%\) carbon, refer to the Iron-Carbon Phase Diagram and locate the point corresponding to \(0.25 \mathrm{wt} \%\) carbon. The approximate temperature at which it is desirable to heat this alloy during a full anneal heat treatment is the temperature at which the Austenite phase (FCC) is stable. From the phase diagram, this temperature is around \(750 ^\circ \mathrm{C}\).
02

(b) \(0.45 \mathrm{wt} \% \mathrm{C}\) Alloy

Similarly, for the alloy with \(0.45 \mathrm{wt} \%\) carbon, refer to the Iron-Carbon Phase Diagram and locate the point corresponding to \(0.45 \mathrm{wt} \%\) carbon. The approximate temperature at which it is desirable to heat this alloy during a full anneal heat treatment is the temperature at which the Austenite phase (FCC) is stable. From the phase diagram, this temperature is around \(725 ^\circ \mathrm{C}\).
03

(c) \(0.85 \mathrm{wt} \% \mathrm{C}\) Alloy

For the alloy with \(0.85 \mathrm{wt} \%\) carbon, refer to the Iron-Carbon Phase Diagram and locate the point corresponding to \(0.85 \mathrm{wt} \%\) carbon. The approximate temperature at which it is desirable to heat this alloy during a full anneal heat treatment is the temperature at which the Austenite phase (FCC) is stable. From the phase diagram, this temperature is around \(700 ^\circ \mathrm{C}\).
04

(d) \(1.10 \mathrm{wt} \% \mathrm{C}\) Alloy

Finally, for the alloy with \(1.10 \mathrm{wt} \%\) carbon, refer to the Iron-Carbon Phase Diagram and locate the point corresponding to \(1.10 \mathrm{wt} \%\) carbon. The approximate temperature at which it is desirable to heat this alloy during a full anneal heat treatment is the temperature at which the Austenite phase (FCC) is stable. From the phase diagram, this temperature is around \(680 ^\circ \mathrm{C}\). In conclusion, the approximate temperatures for full anneal heat treatments of the given iron-carbon alloys are: (a) \(0.25 \mathrm{wt} \% \mathrm{C}\): \(750 ^\circ \mathrm{C}\) (b) \(0.45 \mathrm{wt} \% \mathrm{C}\): \(725 ^\circ \mathrm{C}\) (c) \(0.85 \mathrm{wt} \% \mathrm{C}\): \(700 ^\circ \mathrm{C}\) (d) \(1.10 \mathrm{wt} \% \mathrm{C}\): \(680 ^\circ \mathrm{C}\)

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