XRD Evidence for Phase Structures of Niobium Alloyed Austempered Ductile Iron
This paper presents the changes on phase structures of niobium alloyed ductile iron after austempering process which started by austenitizing process at 900ⅹC and held at 350ⅹC 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.
XRD Phase structure Niobium Austempered Ductile Iron
Bulan Abdullah Siti Khadijah Alias Ahmed Jaffar Nor Hayati Saad Mohd Faizul Idham Abdullah Ramli
Faculty of Mechanical Engineering, Universiti Teknologi MARA, Malaysia Faculty of Sciences & Biotechnology, Universiti Selangor, Malaysia
国际会议
沈阳
英文
431-434
2011-11-22（万方平台首次上网日期，不代表论文的发表时间）