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- Title
Potential of Green Sand Rice Husk Ash Mould as Carbide Deactivator in Thin Wall Ductile Iron.
- Authors
Ochulor, Ezenwanyi F.; Amuda, Mohammed O. H.; Adeosun, Samson O.; Balogun, Sanmbo A.
- Abstract
Thin wall ductile iron (TWDI) components are prone to massive carbide precipitates and non-nodular graphite in the as-cast microstructure. Precipitated carbide phase is brittle and damaging to mechanical properties of the iron matrix. The non-nodular graphite reduces nodularity ratings, ductility, tensile and fatigue strength. The use of cast 2 mm TWDIs for automotive parts' applications is limited owing to the above short comings. Moulding sand thermal characteristics is vital in defining the solidification kinetics of a cast part, which in turn determines the evolving microstructure and mechanical properties. Modification of the thermal properties of moulding sand mix for the production of sound 2 mm TWDI castings in automotive applications is expected to suppress these microstructural features that limit this profile application. Efficient monitoring of cooling rate of solidifying cast parts will be a useful step towards controlling and tailoring cast TWDIs properties to desired application. This study presents the effects of 1-6 wt.% rice husk ash (RHA) additions to moulding sand on microstructure (Optical and SEM) and mechanical properties of cast 2 mm TWDIs. RHA significantly reduced carbide precipitates in microstructure of cast 2 mm TWDI parts, also castings with nodularity ratings ~ 90%, high nodule count > 1,000 nodules / mm2 and high strength of 564 MPa were obtained at 4 wt. % RHA addition. High ductility of 4.7 occurred at 6 wt. % RHA addition.
- Subjects
RICE hulls; RICE residues; MICROSTRUCTURE; NODULAR iron; CAST-iron; METAL castings
- Publication
West Indian Journal of Engineering, 2018, Vol 41, Issue 1, p4
- ISSN
0511-5728
- Publication type
Article