Question

Choose the method that will make the microstructure of spheroidite in an iron and carbon steel with eutectoid composition.

Start at 900C then cool slowly. Afterwards reheat to 800C for over a day.

Start with a tempered martensite and heat to 700C for over a day.

Start at 900C then cool slowly. Afterwards reheat to 700C for over a day.

Start with a pearlite and heat to 800C for over a day.

Answer 1

The method that will make the microstructure of spheroidite in an iron and carbon steel with eutectoid composition is Starting with a tempered martensite and heat to 700C for over a day.(OPTION B).

DESCRIPTION:

=>Martensite refers to a very hard constituent of the alloy of iron and carbon (steel).It is formed by rapid cooling process which traps carbon atoms that does not allow it to diffuse out of the crystal structure.

=>Heating to 700°C for 20 h the specimen will transform the martensite to spheroidite.

#HOPE THIS WILL HELP YOU......

#THANK YOU....!!!