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Effect of Heat Treatment on Mechanical Properties for Grey Cast IRON | ||
| Iraqi journal of mechanical and material engineering | ||
| Article 1, Volume 12, Issue 1, 2012, Pages 107-118 | ||
| Author | ||
| Ahmed R | ||
| Abstract | ||
| In this study grey cast iron welded by arc carbon method for two state: first the sample welded immediately, second the sample preheating to 500 o C for samples of weld Region and heat affect zone HAZ then cooling in different media ( air , dry sand and furnace) after test we found that decreasing in hardness and tensile strength, when the cooling rate decrease than that of cooling in the air, microstructure located on the surface of the weld sample convert to Martinsite Phase ( M ), For the sample which cooling in dry sand and furnace, the hardness was less because of decreasing cooling rate that made less changing in microstructure. It was also found that the decreasing in hardness when preheating for sample and increasing in tensile strength led to obviation growth in grain size resultant partial decomposing for perlite that lead to improving toughness and Impact strength . | ||
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