Which of the following has maximum hardness austenite pearlite troostite martensite?
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Answer: Martensite
Step-by-step explanation:
Martensite has the highest hardness of all four.
Martensite is a supersaturated solid solution of carbon confined in a body-centered tetragonal structure.
Since it is formed by rapid quenching of the austenite structure, the carbon atoms do not have time to diffuse from the crystal structure in sufficient quantity to form cementite, so it has maximum hardness.
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