6. Processing and Characterization

Heat Treatment — Quiz

Test your understanding of heat treatment with 5 practice questions.

Practice Questions

Question 1

What defines the critical cooling rate in steel hardening?

Question 2

Using the Hall–Petch relationship $\sigma_y=\sigma_0+k\,d^{-1/2}$ with $\sigma_0=150\,\mathrm{MPa}$ and $k=0.5\,\mathrm{MPa}\,\mathrm{m}^{1/2}$, calculate the increase in yield strength when grain diameter decreases from $20\times10^{-6}\,\mathrm{m}$ to $10\times10^{-6}\,\mathrm{m}$.

Question 3

Which diagram is most appropriate for designing continuous cooling heat treatments showing transformations under non‐isothermal conditions?

Question 4

Which alloying element most significantly increases the hardenability of carbon steels by delaying ferrite and pearlite formation?

Question 5

What key difference distinguishes austempering from martempering in steel heat treatment?