Cavitation erosion behavior of austempered ductile irons of increasing hardness

The cavitation erosion mechanisms of three austempered ductile irons (ADIs) of 279, 333 and 469 Brinell hardness in a heavy-duty engine coolant at 82 °C were described. Sample weight was measured in 14 time steps up to 4 h and complemented by image sequences showing surface damage evolution in detai...

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Bibliographic Details
Published in:Wear 2021-11, Vol.484-485, p.204036, Article 204036
Main Authors: Abreu, Marcio, Elfsberg, Jessica, Jonsson, Stefan
Format: Article
Language:English
Subjects:
Austempered ductile iron
Brinell hardness
Cavitation
Cavitation erosion
Ductile erosion
Engine coolants
Erosion mechanisms
Graphite nodule
Materials Science and Engineering
Nodular iron
Teknisk materialvetenskap
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Summary:The cavitation erosion mechanisms of three austempered ductile irons (ADIs) of 279, 333 and 469 Brinell hardness in a heavy-duty engine coolant at 82 °C were described. Sample weight was measured in 14 time steps up to 4 h and complemented by image sequences showing surface damage evolution in detail. A rapid mass loss during the first 1.5 min was attributed to surface graphite erosion, with complete nodule removal within 5 min in all ADIs. Matrix erosion became steady after 30 min, but differed in severity between ADIs, with relative mass loss rates of 4.3 : 1.5 : 1 for ADIs of low, medium and high hardness, respectively. •Cavitation erosion resistance of ADIs depends on ausferrite hardness.•Damage rates can differ more than 4x.•Graphite nodules are removed at very early stages of exposure to cavitation.•Detailed image sequences of subtle surface changes explain damage mechanisms.
ISSN:0043-1648
1873-2577
1873-2577
DOI:10.1016/j.wear.2021.204036