SUITABILITY OF RICE HUSK ASH MOULD ADDITIVE FOR THIN  WALL DUCTILE IRON GRAPHITE CHARACTERISTICS

EF Ochulor; MOH Amuda; SO Adeosun; SA Balogun

doi:10.4314/njt.374.1862

SUITABILITY OF RICE HUSK ASH MOULD ADDITIVE FOR THIN WALL DUCTILE IRON GRAPHITE CHARACTERISTICS

Authors

EF Ochulor DEPT. OF METALLURGICAL AND MATERIALS ENGINEERING, UNIV. OF LAGOS, AKOKA, LAGOS STATE, NIGERIA
MOH Amuda DEPT. OF METALLURGICAL AND MATERIALS ENGINEERING, UNIV. OF LAGOS, AKOKA, LAGOS STATE, NIGERIA
SO Adeosun DEPT. OF METALLURGICAL AND MATERIALS ENGINEERING, UNIV. OF LAGOS, AKOKA, LAGOS STATE, NIGERIA
SA Balogun DEPT. OF MECHANICAL AND BIOMEDICAL ENGR., BELLS UNIVERSITY OF TECHNOLOGY, OTA, OGUN STATE, NIGERIA

DOI:

https://doi.org/10.4314/njt.374.1862

Keywords:

cooling rate, carbide precipitate, nodules, properties, sand

Abstract

Thin wall ductile iron (TWDI) components are used in automobile and related sectors owing to weight savings without sacrificing functional properties. However, its application is hampered by low ductility owing to carbide precipitation and poor nodule characteristics in as-cast structure. In this study, mould thermal characteristics are adjusted using rice husk ash (RHA). Green sand was blended with 1-6 wt. % RHA to produce moulds for casting of 4 mm TWDIs, samples obtained were subjected to microstructural (Optical, SEM and EDS), hardness and strength analyzes. Elemental composition of carbide precipitates showed iron and carbon. Nodularity ratings > 90%, nodule count >1000 nodules/mm²and strength of 596 MPa were observed in samples cast in 4 wt. % RHA sand mix. Ductility of 6.1 occurred in 6 wt. % RHA/sand mix. The sand-RHA mix offers cooling rate control, reduction of precipitation of deleterious carbides and superior graphite characteristics in 4 mm TWDI castings.

http://dx.doi.org/10.4314/njt.v37i4.19

Downloads

Published

2018-09-30

Issue

Vol. 37 No. 4 (2018)

Section

Chemical, Industrial, Materials, Mechanical, Metallurgical, Petroleum & Production Engineering

License

The contents of the articles are the sole opinion of the author(s) and not of NIJOTECH.

NIJOTECH allows open access for distribution of the published articles in any media so long as whole (not part) of articles are distributed.

A copyright and statement of originality documents will need to be filled out clearly and signed prior to publication of an accepted article. The Copyright form can be downloaded from http://nijotech.com/downloads/COPYRIGHT%20FORM.pdf while the Statement of Originality is in http://nijotech.com/downloads/Statement%20of%20Originality.pdf

For articles that were developed from funded research, a clear acknowledgement of such support should be mentioned in the article with relevant references. Authors are expected to provide complete information on the sponsorship and intellectual property rights of the article together with all exceptions.

It is forbidden to publish the same research report in more than one journal.

How to Cite

SUITABILITY OF RICE HUSK ASH MOULD ADDITIVE FOR THIN WALL DUCTILE IRON GRAPHITE CHARACTERISTICS. (2018). Nigerian Journal of Technology, 37(4), 989-998. https://doi.org/10.4314/njt.374.1862