4. Materials and Manufacturing

Metallurgy — Quiz

Test your understanding of metallurgy with 5 practice questions.

Practice Questions

Question 1

According to Steven and Hayes, the bainite start temperature Bs (°C) for low-alloy steels is given by $Bs = 830 - 270C - 90Mn - 37Si - 70Cr$. For a steel with 0.40 % C, 1.0 % Mn, 1.0 % Si, and 0.5 % Cr, what is Bs?

Question 2

Which of the following correctly distinguishes upper bainite from lower bainite in steel microstructures?

Question 3

Quenching and partitioning (Q&P) heat treatment improves mechanical properties primarily by:

Question 4

Austempering of steel involves isothermal holding in the bainite region. Which microstructure predominates after austempering?

Question 5

For a gear requiring a hard, wear-resistant surface and a tough ductile core, which heat treatment is most appropriate?