Which one of the following statements is false with regard t

Which one of the following statements is false with regard to the hot rolling of a cast ingot? a) Hot rolling is done to minimize or eliminate porosity defects and shrinkage void defects b) Hot rolling is done to convert large columnar grains into smaller, equi-axis grains c) Hot rolling is done to improve the ductility of the metal d) Hot rolling is done to improve the strength of the metal e) None of the above

Solution

D) hot rolling is done to improve the strength of materials

If the metal goes to recrystallization temperature, it keeps the materials from strain hardening, which ultimately keeps the yield strength and hardness low and ductility high.