It first says

1. Identify the microstructure resulting from each of the following heat treatments applied to a 3140 steel. Be sure to indicate approximate percentages of all phases present. Each treatment begins with Austenitizing at \( 800 \mathrm{C} \) before beginning the cooling operation. (RT=Room Temp). Microstructures must be described in terms of Bainite, Pearlite, Martensite, and pro-Eutectoid ferrite.

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3. Identify the microstructure resulting from each of the following heat treatments applied to a 3140 steel. Be sure to indicate approximate percentages of all phases present. Each treatment begins with Austenitizing at 800 C before beginning the cooling operation. (RT-Room Temp). Microstructures must be described in terms of Bainite, Pearlite, Martensite, and pro-Eutectoid ferrite. (15) A. Quench to 400C, hold 500 sec, cool to RT B. Quench to 600C, hold 18sec, Quench to RT C. Quench to 500C, hold 20sec, Quench to 400C, hold 30sec, Quench to RT D. What is the approximate hardness for the component treated according to A ? E. Reheat the part in "B" to 600C and hold for 24 hours. Cool to RT