Effect of Mill Scale Particulate in Sand Mould on the Microstructure and Mechanical Properties of Cast 6063 Aluminium Alloys

Authors

  • D. T. Oloruntoba Department of Metallurgical and Materials Engineering, Federal University of Technology Akure
  • S. O. Seidu Department of Metallurgical and Materials Engineering Federal University of Technology, Akure, Ondo State, Nigeria

Abstract

The effect of the use of mill scale admixtures in sand mould on the mechanical properties of cast aluminium was investigated. The sand mould contains varying proportions of the mill scale suchas 0 %, 10 %, 15 %, 20 %, 25 % and30 % volume/weight. The cooling rate of the mould was considered while the mechanical properties and the microstructure analysis of the cast metal were carried out. It was observed that percentage increase in mill scale promotes rapid cooling which enhances grain refinement. The tensile strength was found to increase from 143.42N/mm2 to 191.69 N/mm2 while the hardness properties were found to increase from 42.9 BHN to 61.5 BHN. The microstructural examination of the specimens was observed and revealed more fine grains as the percentage of mill scale increases from 0 % to 30 % in the sand mould. Mill scales from steel rolling mills could find application as additives to moulding sands for the production of cast aluminium in foundry industries in Nigeria.

 

Keywords: Sand-mould, Mill-scale, Aluminium, Mechanical properties, Cooling-rate, Microstructure

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Published

2019-03-28

Issue

Vol. 8 No. 2 (2014): FUTA Journal of Engineering and Engineering Technology

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