Microstructure and fracture of alloyed austempered ductile iron
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An investigation has been conducted on two austempered ductile irons alloyed with Cu and Cu+Ni, austenitized at 900 degrees C and austempered at 350 degrees C. The microstructure and fracture mode developed through these treatments have been identified by means of light and scanning electron microscopy and X-ray diffraction analysis. Impact energy measurements were performed on un-notched Charpy specimens. The maximum value of retained austenite volume fraction observed in the material alloyed with Cu+Ni was higher than in that alloyed with Cu austenitized and austempered under the same conditions. This led to the material alloyed with Cu+Ni having higher impact energy and substantial plastic deformation. (c) 2006 Elsevier Inc. All rights reserved.
Кључне речи:alloyed ductile iron / bainitic transformation / retained austenite / impact energy
Извор:Materials Characterization, 2006, 57, 4-5, 211-217
ISSN: 1044-5803 (print)