Question

The typical characteristic of a stress-strain diagram for cast iron

• A. High ductility and low yield strength
• B. Low ductility and high brittleness
• C. High toughness and elongation
• D. Uniform strain hardening behavior

Hint:

Cast Iron Properties. Generally brittle, low ductility, high compressive strength, relatively low tensile strength. Stress-strain curve shows minimal plastic region before fracture.

Answer 1

The Correct Option is B

Cast iron is known for its brittleness compared to steel.
Its stress-strain diagram typically shows: - A relatively linear elastic region up to fracture (or very close to it).
- Very little plastic deformation (low ductility/elongation).
- Fracture occurs suddenly without significant yielding or necking.
- Often higher compressive strength than tensile strength.
Option (1) is incorrect (low ductility).
Option (3) is incorrect (low elongation implies low ductility, and brittle materials often have low toughness).
Option (4) is incorrect (brittle materials show little to no strain hardening).
Option (2) accurately describes cast iron's behavior as having low ductility (little plastic deformation) and consequently high brittleness (tendency to fracture without significant deformation).