XRD Evidence for Phase Structures of Niobium Alloyed Austempered Ductile Iron

Bulan Abdullah; Siti Khadijah Alias; Ahmed Jaffar; Saad Nor Hayati; M. F. Idham; Abdullah Ramli

doi:10.4028/www.scientific.net/AMR.457-458.431

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 457-458XRD Evidence for Phase Structures of Niobium...

XRD Evidence for Phase Structures of Niobium Alloyed Austempered Ductile Iron

Abstract:

This paper presents the changes on phase structures of niobium alloyed ductile iron after austempering process which started by austenitizing process at 900°C and held at 350°C for 1 hour, 2 hours and 3 hours in salt bath furnace. The phase structure were observed by light microscope, and then verified through X-Ray diffraction (XRD). The phase structure of as cast niobium alloyed ductile iron mainly consists of graphite nodules embedded in ferrite and pearlite phases with presence of niobium carbide. Austempering process resulted in the structure of graphite nodules embedded in ferrite platelets and bainitic structures. Increasing the austempering holding times had resulted in coarsening of the ferrite platelets structures and transformation from lower bainite to upper bainite structures.

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Periodical:

Advanced Materials Research (Volumes 457-458)

Pages:

431-434

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.457-458.431

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Online since:

January 2012

Authors:

Bulan Abdullah, Siti Khadijah Alias, Ahmed Jaffar, Saad Nor Hayati, M. F. Idham, Abdullah Ramli

Keywords:

Austempered Ductile Iron, Niobium, Phase Structure, X-Ray Diffraction (XRD)

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