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Title: | Effect of austempering temperature on cavitation behaviour of unalloyed ADI material | Authors: | Dojcinovic M. Eric O. Rajnović, Dragan Sidjanin L. Baloš, Sebastian |
Issue Date: | 17-Jun-2013 | Journal: | Materials Characterization | Abstract: | 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 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 C has a higher cavitation resistance in water than ADI austempered at 300 C. A higher amount of retained austenite in ADI austempered at 400 C played an important role in increasing cavitation resistance. The good cavitation behaviour of ADI austempered at 400 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. © 2013 Published by Elsevier Inc. | URI: | https://open.uns.ac.rs/handle/123456789/8858 | ISSN: | 10445803 | DOI: | 10.1016/j.matchar.2013.05.005 |
Appears in Collections: | FTN Publikacije/Publications |
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