Consider a process for cooling a part made from 0.76 weight percent carbon steel

Question

Consider a process for cooling a part made from 0.76 weight percent carbon steel. The part s arts above 727 C. First, t is cooled rap y to 650°C and held until 50% of the transformation occurs Next it ls cooled rapidly to 55 C and held until ansformed Then, t s cooled ap diy o 0 and held until 10 % o he ema ng original phase dent the star anden po nts on the diagram that should be se to describe each of % 0 he remaining ong nal phase is these cooling phases a s o me Drag-and-drop the appropriate labels to their respective targets. Reset Hellp The process at 650°C goes from pointto point The process at SSrc goes from pointo poin The process at 300C goes from pointto point 800 ? ?| 700 600? 500 400 300 200 100 0.1 10 0 10 01 Time, seconds

Explanation / Answer

The diagram given is the isothermal cooling curve.

The process at 650 o C goes from A1 to A3. If it is going Up to A4, all the austenite transforms completely into coarse pearlite.

The process at 550 oC goes from B1 to B3. By this time remaining half of austenite transformed to pearlite. Now 25% austenite and 75 % pearlite exists.

The process at 300 C goes from C1 to C4. Now we get a transformation product with 25% bainitevand remaining pearlite.

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