Multiple choice 6 On the basis of microstructure briefly exp

Multiple choice

6. On the basis of microstructure, briefly explain why gray iron is brittle and weak in tension.

a. The graphite phase is brittle which makes the entire material brittle

b. The flake shape of the graphite introduces stress concentration locations which cause the material to become brittle

c. The iron-rich phase can form pearlite under some situations which creates a brittle material

d. The grain size of the material is small which translates to poor ductility

Solution

Gray iron is weak and brittle in tension because the tips of the graphite flakes act as points of stress concentration.

option b