I. A full annealing is often utilized in low- and medium-carbon steels II. A ferritic transformation occurs when the quenching rate is rapid enough to prevent carbon diffusion III. Spheroidizing is the heat treatment method for these steels to develop a machinable and deformable structure Which statement(s) given above is/are correct?

1. 1. Using the isothermal transformation diagram below, describe the microstructure present in a eutectoid carbon steel, after each of the following heat treatments. From 800 C: (a) Cool to 450 C and hold for 10 s, cool to 375 C hold for 100 s, quench to 25 C. (b) Cool to 650 C and hold for 300 s, and quench to 25 C. (c) Cool to 720 C and hold for 100 s, quench to 400 C and hold for 200 s, and quench to 25 C. Temperature (°C) 800 700 600 500 400 300 200 100 0 10-1 A A A M(start) M(50%) M(90%) 1 10 M+A Eutectoid temperature P 10² Time (s) B 50% 10³ 104 1400 1200 1000 800 600 400 200 105 Temperature (°F)

Briefly describe the transformation of a hypereutectoid plain-carbon steel (0.4 percent C) with slow cooling.

What is the marcosopic structure of metallic in low carbon and then high carbon  steels .

To provide the highest strength in a nonferrous alloy, which is the best processing route for aging?     Heat in a single phase field and allow to cool slowly to room temperature through the two-phase field to precipitate the secondary phase     Heat in a single phase field, quench, then re-heat at a lower temperature in the two phase field     Heat in a single phase field then lower the temperature into the two phase field and hold at that temperature     Heat in a single phase field then lower the temperature into the two phase field and hold at that temperature

Q1: 1.5 in diameter steel part is quenched in oil with no agitation. (H=0.20). If we use a 4340; 4140; 8640; 5140; 1040 steel, what would be the hardness number at the center of the part? Q2: Determine the best quenching medium to produce a minimum hardness of HRC 40 at the center of a 3.75 cm diameter 4320 steel bar, Given re n 4340 50 8640 9310 Sie 4320 1050 10 20 10 20 30 Jominy distance (th of an inch) TABLE Fhe N coeticiet ar severily af the quench, far several omehing med Cosling Ratethe Center Medium Coeicien O ne gato Otton 0 (re aghuion Ho laghatord Brire ne agtnoni tre agn 025 10 10 20 DIAMETER IN) HFACTOR Rockwell Channess

Heat Treatments of metals: State the purposes of and describe the procedures for the following metal heat treatments: 1. process annealing 2. stress relief annealing 3. normalizing 4. full annealing 5. spheroidizing

Consider an AISI 1045 ferrite and pearlite microstructure. The sample is initially heated to 845 deg C and quenched in water. The samples are then tempered for 20 minutes at 316 deg c, 425 deg c, and 600 deg c.  Can yu tell me what would happen to the microstructure hardness os the samples as a result of quenching, tempering theory wise.

What is the composition (wt% C) of a steel with AISI designation 1090? .Would this be considered a low, medium, or high carbon steel? (circle one)

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