If you want to have a really strong and ductile steel which

If you want to have a really strong and ductile steel, which one would you choose Martensite Tempered martensite Coarse pearlite Fine pearlite If you want the strongest steel that is still ductile, which one would you choose Tempered martensite that has been tempered for 3 hrs at 300 degree C Tempered martensite that has been tempered for 2 hr at 600 degree C Tempered martensite that has been tempered for 1 hr at 300 degree C Pearlite with a high concentration of cementite

Solution

5. Fine pearlite is strongest and most ductile among them because the cementite is least in pearlite and incresing pearlite reduces the ductility or increases the brittleness.

6. strongest steel with ductility can be achieved by tempered martensite that has been tempered for 2 hr at 600 C because the mechanical properties depend on particle size and particle size depend on temperatureand time it is tempered. More the both more ductile the steel