McqMate
| Q. |
Which material is present above the upper critical temperature line in an iron carbon phase diagram? |
| A. | martensite |
| B. | pearlite |
| C. | ledeburite |
| D. | austenite |
| Answer» D. austenite | |
| Explanation: above the upper critical line in a iron carbon phase diagram, all the material is austenite while below the lower critical no austenite material exists. | |
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