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Why is gray cast iron annealed?
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Engineering Metallurgy
Q. Why is gray cast iron annealed?
- Published on 11 Sep 15
a.
Graphitize carbide
b.
Decrease ductility
c.
Both a. and b.
d.
None of the above
ANSWER: Graphitize carbide
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Discussion
Sravanthi
-Posted on 21 Nov 15
- Residual stresses are developed in gray cast iron due to cooling and contraction.
- The stresses developed can be removed by by soaking it at 650° C but is avoided because grain growth is serious above 600 °C.
- Hence, gray cast iron is annealed to graphitize carbide. This treatment homogenises casting, softens, increases machinability and ductility of gray cast iron.
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