A study on the particle erosion of upper bainitic austempered ductile iron

A ductile iron of ∼3.5 wt.% C and ∼2.8 wt.% Si was austempered at 420 °C for 0.5, 1, 2 and 3 h. These upper bainitic austempered ductile iron (ADI) specimens were then eroded by Al 2O 3 particles of ∼275 μm grit size under the average particle velocity of 73 m s −1. According to the experimental res...

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Bibliographic Details
Published in:Wear 2002-06, Vol.252 (11), p.985-991
Main Authors: Hung, F.Y, Chen, L.H, Lui, T.S
Format: Article
Language:English
Subjects:
Applied sciences
Austempered carbide
Austempered ductile iron
Brittle cracking
Contact of materials. Friction. Wear
Ductile erosive wear
Exact sciences and technology
Friction, wear, lubrication
Machine components
Mechanical engineering. Machine design
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Particle erosion
Retained austenite
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Summary:A ductile iron of ∼3.5 wt.% C and ∼2.8 wt.% Si was austempered at 420 °C for 0.5, 1, 2 and 3 h. These upper bainitic austempered ductile iron (ADI) specimens were then eroded by Al 2O 3 particles of ∼275 μm grit size under the average particle velocity of 73 m s −1. According to the experimental results, 0.5 h austempered specimen, which contains largest amount of retained austenite and no austempered carbide, is more erosion resistant than the other ADI specimens and the same cast iron of other common matrix structures. To increase the austempering time will induce brittle cracks at normal impact and shift the impact angle of maximum erosion rate to a higher one. The results also indicate the formation of ε-carbide upon particle impingement. Retained austenite is not the only phase to be transformed during the erosion process.
ISSN:0043-1648
1873-2577
DOI:10.1016/S0043-1648(02)00057-1