Determine the process to transform a hunk of Martensite into

Determine the process to transform a hunk of Martensite into 50% pearlite and 50% Bainite each with the maximum possible ductility. Specify procedures with specific temperatures and times. What is final overall hardness?

Solution

1. Heat martensite to austenite temperature

2. rapidly cool to 650oC; hold 20s

3. rapidly cool to 400oC, hold 103s

4. quench to room temp

From figure:

Hardness will be around 385 BHN

Ductility: around 50 %RA