Martensite forms for High cooling rates Low cooling rates Fo

Martensite forms for High cooling rates Low cooling rates For eutectoid steels only b and c Isothermal transformation diagrams are used To determine the final microconstituents present When the temperature does not change When the sample is left to cool at a specific cooling rate a and b a and c Continuous Cooling transformation diagrams are used To determine the final microconstituents present When the temperature does not change When the sample is left to cool at a specific cooling rate a and b a and c Tempering martensitic steel will: increase the strength and hardness and increase ductility increase the strength and hardness and decrease ductility decrease the strength and hardness and increase ductility decrease the strength and hardness and decrease ductility Spheroidite is created when: Reheating Bainite, Pearlite, Ferrite or Cementite at a temperature just below the eutectoid temperature Reheating Bainite, Pearlite, Ferrite or Cementite at a temperature just above the eutectoid temperature Reheating Martensite at any temperature Reheating Martensite at a temperature just below the eutectoid temperature Which is the strongest but most brittle of the microconstituents Bainite Pearlite Cementite Martensite Tempered martensite Fine pearlite is stronger than coarse pearlite True False

Solution

Answer of 1. a)

Answer of 2. a)

Answer of 3. c)

Answer of 4. c)

Answer of 5. a)

Answer of 6. d)

Answer of 7. a)