Chapter 10.9, Problem 19QP

(a)

To determine

Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure,

Cool rapidly to $\text{350°C}\left(\text{660°F}\right)$, hold for ${\text{10}}^{\text{3}}\text{s}$, then quench to room temperature:

(b)

To determine

Cool rapidly to $\text{625°C}\left(\text{1160°F}\right)$, hold for $\text{10}\text{s}$, then quench to room temperature:

(c)

To determine

Cool rapidly to $\text{600°C}\left(\text{1110°F}\right)$, hold for $\text{4}\text{s}$, rapidly cool to $\text{450°C}\left(\text{840°F}\right)$, hold for $\text{10}\text{s}$, then quench to room temperature:

(d)

To determine

Reheat the specimen in part (c) to $\text{700°C}\left(\text{1290°F}\right)$ for $\text{20}\text{h}$.

(e)

To determine

Rapidly cool to 300°C (570°F), hold for 20 s, then quench to room temperature in water. Reheat to 425°C (800°F) for 103 s and slowly cool to room temperature.

(f)

To determine

Cool rapidly to 665°C (1230°F), hold for 103 s, then quench to room temperature.

(g)

To determine

Rapidly cool to 575°C (1065°F), hold for 20 s, rapidly cool to 350°C (660°F), hold for 100 s, then quench to room temperature.

(h)

To determine

Rapidly cool to 350°C (660°F), hold for 150 s, then quench to room temperature: