Journal
MATERIALS CHARACTERIZATION
Volume 82, Issue -, Pages 66-72Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2013.05.005
Keywords
Cavitation; Unalloyed austempered ductile iron; Austempering temperature; SATRAM phenomenon
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Funding
- Ministry of Education, Science and Technological Development of The Republic of Serbia [TR34015]
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This paper provides an in-depth study and description of cavitation damage and microstructural changes in two types of unalloyed austempered ductile iron (ADI). ADI materials used were austempered at 300 and 400 degrees C having ausferrite microstructure with 16 and 31.4% of retained austenite, respectively. Metallographic examination was carried out to study the morphology of their cavitation-damaged surfaces. Cavitation damage was initiated at graphite nodules as well as in the interface between a graphite nodule and an ausferrite matrix. Furthermore, microcracking and ferrite/retained austenite morphology were proved to be of great importance for cavitation resistance. Mass loss rate revealed that ADI austempered at 400 degrees C has a higher cavitation resistance in water than ADI austempered at 300 degrees C. A higher amount of retained austenite in ADI austempered at 400 degrees C played an important role in increasing cavitation resistance. The good cavitation behaviour of ADI austempered at 400 degrees C was due to the matrix hardening by stress assisted phase transformation of retained austenite into martensite (SATRAM) phenomenon, as shown by X-ray diffraction analysis. (C) 2013 Elsevier Inc. All rights reserved.
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