Question 3- Examine the following microstructures and conditions of annealed cartridge brass (70Cu-30Zn) and answer to the questions below. Annealed Brass + 50% cold work Annealed Brass + 50% Cold work +recrystallized 15 minutes at 450C 100 m Annealed Brass + 50% Cold work +recrystallized 60 minutes at 450C a) Explain why the grain size is larger in the sample annealed for longer time. b) Which one of the recrystallized samples above have higher strength? Why? Examine the following microstructures of annealed cartridge brass (70Cu-30Zn) at different temperature