Tensile Strength Properties of Niobium Alloyed Austempered Ductile Iron on Different Austempering Time

Abstract:

This study focused on tensile strength properties inclusive of ultimate tensile strength and elongation values of niobium alloyed ductile iron in as cast and austempered conditions. The tensile specimens were machined according to TS 138 EN 10002-1 standard. Austempering heat treatment was conducted by first undergoing austenitizing process at 900°C before rapidly quenched in salt bath furnace and held at 350°C for 1 hour, 2 hours and 3 hours subsequently. The findings indicated that austempering the samples for 1 hour had resulted in improvement of almost twice of the tensile strength in niobium alloyed ductile iron. Improvement of elongations values were also noted after 1 hour austempering times. Increasing the austempering holding times to 2 hour and 3 hours had resulted in decrement in both tensile strength and elongations values.

• Periodical: Advanced Materials Research (Volumes 457-458)
• Pages: 1155-1158
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.457-458.1155
• Online since: January 2012
• Authors: Bulan Abdullah, Siti Khadijah Alias, A. Jaffar, Abd Amirul Rashid, M. Haskil, A. Ramli
• Keywords: Austempered Ductile Iron, Niobium, Tensile Properties

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