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This lecture is good, but I want to tell you one thing: you need not go to -50 degrees Celsius; instead, a critical cooling rate is required to get 100% martensite (touching the nose of the c curve). -50 is not beneficial at the industry level. At this temperature, DBTT will occur, which will lead to the failure of the material. 100% martensite is also not recommended. Some of the bainitic presence is required for good core strength and toughness to avoid brittleness.
