The Influence of Austempering Temperature on the Wear Resistance of Ductile Iron under Two Different Tribosystems

The Influence of Austempering Temperature on the Wear Resistance of Ductile Iron under Two Different Tribosystems

This paper reports the results obtained in a research conducted to evaluate austempered ductile iron (ADI) as a wear resistant material for the production of machine parts processed at intermediate and high austempering temperatures (Ta). Severe abrasion in actual service performance trials and low...

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Bibliographic Details
Published in:ISIJ International Vol. 49; no. 1; pp. 132 - 138
Main Authors: Laino, Sebastian, Ortiz, Hugo R., Dommarco, Ricardo C.
Format: Journal Article
Language:English
Published: Tokyo The Iron and Steel Institute of Japan 01-01-2009
Iron and Steel Institute of Japan
Subjects:
abrasion
Applied sciences
austempering
Contact of materials. Friction. Wear
ductile iron
Exact sciences and technology
hardness
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
microstructure
Austempering
Abrasion
Temperature
ductile iron
Wear
Mechanical properties
Wear resistance
Hardness
Microstructure
Ductile cast iron
Tribology
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Summary:This paper reports the results obtained in a research conducted to evaluate austempered ductile iron (ADI) as a wear resistant material for the production of machine parts processed at intermediate and high austempering temperatures (Ta). Severe abrasion in actual service performance trials and low stress abrasion laboratory tests (ASTM G-65) were carried out along with microstructural characterization by optical microscopy and X-ray diffraction. The results derived show that ADI yields excellent abrasion resistance under the operating conditions resulting from the field tests when Ta is raised. Nevertheless, ADI show an opposite trend under the low stress abrasion conditions imposed by the dry sand/rubber wheel abrasion apparatus (ASTM G-65). The presence of a metastable and ductile ausferrite phase (reacted and unreacted austenite+ferrite) in ADI microstructure appears to be the most relevant factor influencing the performance observed. In addition to a high deformation capability detected at the wear surfaces, an austenite to martensite transformation took place as determined by X-ray diffraction. These two factors combined make the ausferritic microstructure overcome hardness reduction when the austempering temperature is raised, improving or sustaining the resistance to severe abrasive wear but, at the same time, increasing impact toughness.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.49.132