Effect of Niobium Addition on The Morphological Behaviour of Au tempered Ductile Iron

 
 
 
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  • Abstract


    This paper investigate the effect of niobium addition at 0.5 wt% to the morphological behavior of austempered ductile iron. Austempered ductile iron (ADI) and niobium alloyed austempered ductile iron was prepared by first austenitizing the samples at 900°C before austempering process was conducted in salt bath at 1 hour holding time. The samples were then cooled to room temperature. The microstructural observation and analysis in term of nodule count, nodularity percentage and graphite percentages were conducted using Olympus B X 41M microscope with IMAPs 4.0 edition, Scanning electron microscopy (SEM) analyzer using SMARTSEM software and energy-dispersive X-Ray (EDX) spectroscopy. It was found that addition of niobium resulting in formation of niobium carbide (NbC) and much finer retained austenite and acicular ferrite structure.However,the nodularity, nodule count and graphite area were reduced due to the presence of niobium carbide.

     




  • Keywords


    Austempered ductile iron, niobium, morphological behaviour.

  • References


      The authors would like to express their gratitude to the Ministry of Science and Technology, Malaysia (MOSTI) and Ministry of Higher Education Malaysia (MOHE), and Universiti Teknologi Mara for the financial support given to this work through research grant of 600-IRMI/DANA 5/3 REI(12/2017).

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Article ID: 29363
 
DOI: 10.14419/ijet.v7i4.36.29363




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