7. (15 pts) Below is the isothermal transformation diagram for a 0.45 wt%C steel alloy. Using the diagram to determine t

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7 15 Pts Below Is The Isothermal Transformation Diagram For A 0 45 Wt C Steel Alloy Using The Diagram To Determine T 1 (54 KiB) Viewed 42 times

7. (15 pts) Below is the isothermal transformation diagram for a 0.45 wt%C steel alloy. Using the diagram to determine the final microstructure in terms of the microconstituents present and, if possible, the approximate percentage of each, if po) of a small specimen that has been subjected to the following time- temperature treatments. In each case assume that the specimen begins at 850°C, and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (a) Rapidly cool to 700°C, hold at this temperature for 10 s, then quench to room temperature, (b) Rapidly cool to 650°C, hold at this temperature for 100s, then quench to room temperature; (c) Rapidly quench to 310°C and hold at 310°C; (d) Rapidly cool to 410°C, hold for 10 s, then quench to 310°C; (e) Rapidly cool to 500°C, hold for 10-s, then quench to room temperature; 1600 90d 800 1400 700 1200 A.P 600 1000 500 AB 11 Temperature (C) 800 1 Temperature (°F) 400 50% 1 M (start) M (50%) M (90%) 300 800 TO 200 400 1 100 1 200 1 10 10 10- Time (5) 104 10%