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Unformatted text preview: a. ferrite b. cementite c. pearlite (b ) 8. The hardest phase in iron-carbon system is a. austenite b. ferrite c. cementite (c ) 9. Quenching cracks are avoided by a. annealing b.normalizing c. martempering ( c) 10. Martensite is formed by a. nucleation and growth b. diffusionless transformation c. solidification (b ) Bonus question: The blacksmith in your village is approached with a broken farm equipment while tilling the ground. The smart blacksmith took a piece of the broken region and put it against the grinding wheel and he said Ah!, I know why. What did the blacksmith observe and what did he conclude. He observed high generation of sparks. Conclusion: Large amount of cementite brittle phase that also gives rise to sparks...
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This note was uploaded on 10/11/2009 for the course MSE 200 taught by Professor Wholedepartment during the Spring '08 term at N.C. State.
- Spring '08