1.4 Based on the continuous cooling curve given below, which of the following is

Question

1.4 Based on the continuous cooling curve given below, which of the following is correct about the resulting microstructure of cooling curve (3)-rapidly cool to 400°C, hold for 500 s, then quench to room temperature? (A) Ferrite+Bainite (B) Bainite (C) Bainite+ Martensite (D) None of the above 1.5 Based on the continuous cooling curve given below, which of the following is correct about the resulting microstructure of cooling curve (5) rapidly cool to 450°C, hold for 10 s, then quench to room temperature? (A) Ferrite+ Pearlite (B) Bainite (C) Bainite+ Martensite (D) None of the above

Explanation / Answer

In question 1.4 incubation period is so long. So Bainite will form ( option B)

In question 1.5 incubation period is small . So Bainite and Martensite will be produced ( option C)

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