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Title: Effect of austempering temperature on cavitation behaviour of unalloyed ADI material

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. - Highlights: • Cavitation rate of two ADI materials was tested. • ADI material with a lower hardness has had a lower cavitation rate. • The main reason ismore » microstructural transformations during cavitation. • SATRAM phenomenon increases cavitation resistance.« less
Authors:
 [1] ;  [2] ; ;  [3] ;  [3]
  1. University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, Belgrade (Serbia)
  2. Innovation Centre, Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, Belgrade (Serbia)
  3. Department of Production Engineering, Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, Novi Sad (Serbia)
Publication Date:
OSTI Identifier:
22285067
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 82; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AUSTENITE; CAVITATION; FERRITE; GRAPHITE; MARTENSITE; MICROSTRUCTURE; PHASE TRANSFORMATIONS; STELLAR WINDS; X-RAY DIFFRACTION