Shigeo Kotake, Yasuyuki Suzuki and Masafumi Senoo
Department of Mechanical Engineering, Faculty of Engineering, Mie University, Tsu 514-8507
Atomic force microscopy (AFM) was applied to investigate the characteristics of surface topography and the microstructure of nodular graphite (NG) in ductile iron. Surface topography was measured at different intersection planes in NG. Differences between the central profile and the surrounding profile were caused by the cleavage of graphite under radial orientation of NG.
Lateral force images and in situ scratching measurements showed the existence of fine spheroidal platelets. Crystal orientation of nodular graphite was understood from the arrays of spheroidal platelets. Brachyaxes of spheroidal platelets were oriented in the radial direction to form a fan-shaped structure in NG. Some platelets, however, showed anomalous orientations.
(Received October 26, 1998; In Final Form July 12, 1999)
atomic force microscopy, nodular graphite, crystal orientation, topographic image, lateral force image, spheroidal platelet
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