Using the TTT diagram provided below, describe the final microstructure of a sma

Question

Using the TTT diagram provided below, describe the final microstructure of a small specimen that has following six different treatment routes. If pearlite is to form, specify whether it is (1) Path 1 (2) Path 2 (3) Path 3 (4) Path 4 (5) Path 5 After following Path 4, the specimen is heated to 300 degree C and is held at 300 degree C for 3 hours then quenched to room temperature. (6) Path 6 After following Path 2, the specimen is heated to 450 degree c and is held at 450 degree c for hours then quenched to room temperature (7) Path 7 Which path (#1 to #6 above) will produce the microstructure with the highest hardness? Path (8) For a 1040 steel, what would be the final microstructure after the heat treatment of Path 4?

Explanation / Answer

Path 1-Martensite and Austenite
Path 2-Martensite
Path 3-Bainite and Martensite
Path 4-Fine Pearlite
Question 5-Martensite with 3% retained Austenite

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