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Title

EFFECT OF COOLING RATE ON THE MICROSTRUCTURE AND GRAPHITE MORPHOLOGY IN THE DUCTILE IRON-STEEL HOLLOW SPHERE SYNTACTIC FOAMS

Pages

 Start Page 55 | End Page 66

Abstract

 In this study, DUCTILE IRON-steel hollow sphere SYNTACTIC FOAMs were manufactured through sand mold CASTING technique. The STEEL HOLLOW SPHEREs were synthesized in a fluidized bed. In this process, commercial iron powder was coated on the expanded polystyrene spheres. After coating, de-bonding and sintering processes were carried out. Therefore, the STEEL HOLLOW SPHERE produced with 4, 6, and 8 mm in diameter. Then, the STEEL HOLLOW SPHEREs were randomly filled in the cavities of prepared mold and DUCTILE IRON infiltrated into the interstitial spaces between the spheres. Thus, the DUCTILE IRON- STEEL HOLLOW SPHERE SYNTACTIC FOAMs with 4, 6, and 8 mm spheres sizes were manufactured. Microstructural properties of produced foams were investigated by optical microscopy, SCANNING ELECTRON MICROSCOPY (SEM), and energy dispersive X-ray spectroscopy (EDS). In addition, cooling rates in the SYNTACTIC FOAMs with different sphere sizes were calculated and effects of cooling rate on the graphite morphology and microstructure were studied. The results revealed that decreasing of the spheres size caused to increasing the cooling rate. Furthermore, by increasing the cooling rate, surface fraction of graphite, graphite circularity, and surface fraction of iron carbide decrease and graphite nodule count increases.

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