Questions

Quick questions

You should be able to answer these questions without too much difficulty after studying this TLP. If not, then you should go through it again!

1. Where α and β are solid phases, which of the following describes a eutectic transformation?

   	a	\(\alpha + {\rm{liquid}} \to \beta \)
   	b	\(\alpha \to \beta \)
   	c	\({\rm{liquid}} \to \beta + \alpha \)
   	d	\({\rm{liquid}} \to \beta + {\rm{liquid}}\)

2. Where α and β are solid phases, which of the following describes a peritectic transformation?

   	a	\(\alpha + {\rm{liquid}} \to \beta \)
   	b	\(\alpha \to \beta \)
   	c	\({\rm{liquid}} \to \beta + \alpha \)
   	d	\({\rm{liquid}} \to \beta + {\rm{liquid}}\)

3. Which of the following alloying additions stabilises the austenite phase of steel? (You may select more than one)

   1. Carbon - C
   2. Nickel - Ni
   3. Cerium - Ce
   4. Silicon - Si

4. What differences in appearance might you expect between annealing and deformation twins?

   	a	Annealing twins are smaller than deformation twins
   	b	Deformation twins are smaller than annealing twins
   	c	Deformation twins have flat sides, annealing twins are lens-shaped
   	d	Annealing twins have flat sides, deformation twins are lens-shaped
   	e	There are no differences

5. Why is spheroidal cast iron tougher than grey cast iron?