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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)

ISSN:2141-7016

Article Title: Effect of Isothermal Transformation on the Mechanical Properties of Austempered Grey Cast Iron
by Apata A.O and Mukoro E.E

Abstract:
Influence of isothermal transformation on the mechanical properties of austempered grey cast iron was investigated in this study. Austempering heat treatment was carried out at 400oC for 60, 90 and 120 minutes after austenizing at 900oC for 120 minutes. Measurement of ultimate tensile strength, % enlogation, hardness and toughness are presented as a function of austempering time. The results show sensitivity of elongation, ultimate tensile strength, hardness and toughness to austempering time. The highest values of UTS (605MPa), % enlogation (2.8), hardness (515BHN)and impact (55J) were obtained from samples austenized at 900oC and austempered at 400oC for 90 minutes.
Keywords: grey cast iron, isothermal transformation, austempering, mechanical properties
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