Consider the following isothermal transformation diagram for a eutectoid Fe-C alloy. Explain how you would select the time-temperature path to produce a 50% bainite / 50% Martensite, starting from the austenite phase at 800°C
Added by Joseph T.
Step 1
First, we need to cool the austenite phase at 800°C to a temperature below the eutectoid temperature (727°C) but above the bainite start temperature (Bs). This will allow the formation of bainite. Show more…
Show all steps
Your feedback will help us improve your experience
Adi S and 71 other Chemistry 101 educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Adi S.
Using the isothermal transformation diagram for a $1.13$ wt $\%$ C steel alloy (Figure $10.39$ ), determine the final microstructure (in terms of just the microconstituents present) of a small specimen that has been subjected to the following timetemperature treatments. In each case assume that the specimen begins at $920^{\circ} \mathrm{C}\left(1690^{\circ} \mathrm{F}\right)$ and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (a) Rapidly cool to $250^{\circ} \mathrm{C}\left(480^{\circ} \mathrm{F}\right)$, hold for $10^{3} \mathrm{~s}$, then quench to room temperature. (b) Rapidly cool to $775^{\circ} \mathrm{C}$ (1430^\circ), hold for $500 \mathrm{~s}$, then quench to room temperature. (c) Rapidly cool to $400^{\circ} \mathrm{C}\left(750^{\circ} \mathrm{F}\right)$, hold for $500 \mathrm{~s}$, then quench to room temperature. (d) Rapidly cool to $700^{\circ} \mathrm{C}\left(1290^{\circ} \mathrm{F}\right)$, hold at this temperature for $10^{5} \mathrm{~s}$, then quench to room temperature. (e) Rapidly cool to $650^{\circ} \mathrm{C}\left(1200^{\circ} \mathrm{F}\right)$, hold at this temperature for $3 \mathrm{~s}$, rapidly cool to $400^{\circ} \mathrm{C}$ $\left(750^{\circ} \mathrm{F}\right)$, hold for $25 \mathrm{~s}$, then quench to room temperature.
Recommended Textbooks
Chemistry: Structure and Properties
Chemistry The Central Science
Chemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD