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Microstructural Characterization and Some Mechanical Behaviour of Low Manganese Austempered Ferritic Ductile Iron

Abioye, Abiodun A. and Atanda, P. O. and Abioye, Oluwabunmi P. and Afolalu, Sunday A. and Dirisu, J. O. (2017) Microstructural Characterization and Some Mechanical Behaviour of Low Manganese Austempered Ferritic Ductile Iron. International Journal of Applied Engineering Research, 12 (23). pp. 14435-14441. ISSN 0973-4562

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Abstract

This work studied the microstructural characterization and mechanical behavior of low manganese Austempered Ductile Iron (ADI), with a view to improve the properties of iron and to increase the areas of applications. Three sets of ductile iron of specified composition were machined from Y-blocks to tensile and hardness pieces. The samples were preheated at 350 0C for 1hr and austenitised at 900 0C for 1hr in salt bath furnace. The three sets of samples were immediately austempered in the austempering salt bath furnace at uniform austempering temperatures of 300 0C, 350 0C and 400 0C for 90, 120 and 150 minutes; each sample for each temperature window. All sets were prepared for metallographic examination; tensile and hardness tests were carried out. The results showed that maximum hardness, tensile and yield strength were obtained at austempering temperature of 350 0C and at 150 minutes. At 300 0C and 350 0C, it was noticed that the hardness and strength increase with austempering time. The optimum tensile strength was 1300 MPa at 350 0C after austempering for 150 minutes. In conclusion the austempering operation has a significant effect on the mechanical and microstructural properties of ADI.

Item Type: Article
Uncontrolled Keywords: Ausferrite, Spherodial-Graphite, Acicular phase
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs. Julie Ilogho
Date Deposited: 26 Dec 2017 20:15
Last Modified: 21 Feb 2019 10:35
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/9825

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